SpokePOV - Adafruit Learning System
Contents
1. This will give a nice persistant image The faster the better of course Larger wheels you might have to bike a little faster Smaller wheels you can go slower SpokePOV has been tested to work at 30mph but can probably go even faster Can use SpokePOV on a car or motorbike SpokePOV is not for motorbike or car use It is specifically designed for bicycles and bicycle speeds You could easily hurt someone very badly if the spokepov is badly attached to a motorcycle and then flies off at very high speeds O Adafruit https learn adafruit com spokepov Page 6 of 82 Industries Do you have pre assembled SpokePOVs Sadly no only sell kits fun amp easy to make and you ll learn a lot when you build them However you can buy a similar product called Hokey Spokes http adafru it dhF same idea but you can t customize the images Do you have any high rez photos Try e http farm1 static flickr com 46 109571161 c9a4fb7189 o jpg http adafru it dhG e http farm1 static flickr com 159 392464250 2836156f09 o jpg http adafru it dhH O Adafruit https learn adafruit com spokepov Page 7 of 82 Industries Preparation Prep Learn how to solder with tons of tutorials http adafru it aTk Don t forget to learn how to use your multimeter too http adafru it aZZ Tools There are a few tools that are reguired for assembly None of these tools are included If you don t have them now would be a good time t2. SpokePOV Soft Comet First select USB serial or parallel port on Mac you can only choose USB or serial NI wxSpokePOV Contig P ort Type Port Wheel Size d Hub Size Farallel Serial Test Port Comm Delay Adafruit Industries https learn adafruit com spokepov Page 49 of 82 Next for serial or parallel select which port to use Important Note under MacOS X using a USB serial adapter sometimes there are multiple names for one port dev cu KeySeriall and dev cu USA19H1b1P1 1 for example Try both I ve found they act differently and get better reliability with some over others i a SpokePOV File Bank A A Window 000 Port Type gt Wheel Size b j a SR Port p dev cu Bluetooth PDA Sync ea er ue V dev cu KeySeriall AA a A A A AAA A A A AA AA AAA RA NI wxSpokePOV E Ed Contig Pork Type Wheel Size Hub Size Test Port Comm Delay M wxSpokePOV Contig Port Type Wheel Size Hub Size Test Port Comm Delay Check your Device Manager under windows to verify what ports you have available if you re not sure Adafruit https learn adafruit com spokepov Page 50 of 82 Industries Es Device Manager File Action View Help e m TG g J ENTHEOGEN Computer Set Disk drives
3. adafruit learning system SpokePOV Guide Contents Guide Contents 2 Overview 4 Persistence of Vision for your Bike 4 Introduction 4 Specification amp Features 4 F A Q 6 Frequently Asked Questions 6 Preparation 8 Prep 8 Tools 8 SpokePOV Assembly Prep 12 SpokePOV 15 Parts for the SpokePOV Kit 15 SpokePOV Kit Assembly Instructions 16 Parallel Port Dongle 34 Make it Dongle 34 SpokePOV Parallel Port Dongle Parts 34 SpokePOV Dongle Assembly Instructions 34 Serial Dongle 40 Make it Serial dongle 40 Serial Port SpokePOV Dongle Parts 40 Assembling the Serial Dongle 40 USB Dongle 46 Make it Serial dongle 46 USB Port SpokePOV Dongle Instructions 46 Using the USB dongle 46 Customize 48 Use it Upload images 48 Introduction 48 oa https learn adafruit com spokepov Page 2 of 82 Industries Configuring 48 Testing the connection 52 Connecting 54 Install 66 User Manual 66 Installing your SpokePOV 66 Using the SpokePOV 74 Design 76 Hardware design 76 Intro 76 Schematic 76 Microcontroller 77 Sensor 78 Button 78 EEPROM 78 Batteries 78 LEDs 78 Programming header 79 Programming dongle 79 Gallery 80 Here are some photos from other people 80 Download 81 Example images 81 USB Driver windows only 81 C Software 81 wxPython Software 81 Firmware 82 Hardware 82 O Adafruit https learn adafruit com spokepov Page 3 of 82 Industries Overview Persistence of Vision for your Bike Introduction
4. code to the microcontroller The header pinout style is called AVR ISP 10 pin and is one of the prevailing standards for Atmel microcontrollers Programming dongle When it s time to upload images connect one end of the programming dongle to your SpokePOV and the other to the parallel port on your computer The dongle can also be used as a general purpose AVR programmer type DTOO6 using the very popular AVRDUDE software available for windows amp linux bsd etc O Adafruit https learn adafruit com spokepov Page 79 of 82 Industries Gallery Here are some photos from other people e Flickr has a bunch http adafru it dhR e A foldingbike displaying a tree http adafru it dhS e Some abstract designs from Aneel http adafru it dhT e A hacked up version that displays RPM and Scrolling text ona rotating robot blade http adafru it dhU e Some neat designs from theledlightingcompany http adafru it dhV e under s spinning stars http adafru it dhW here is the bmp file http adafru it dhX e Witchgers blue spokepov fun http adafru it dhY Send me your photos or post them to flickr with the tag spokepov so can link it up O Adafruit https learn adafruit com spokepov Page 80 of 82 Industries p poep 9 Download Example images In case you want them again here are the examples used in the factory SpokePOVs http adafru it dhZ USB Driver windows only Here is a driver for the USBtinyISP tha
5. done Connect the dongle to the SpokePOV and your computer parallel port to upload images bought a 6 parallel port extention cable to make it easier Adafruit https learn adafruit com spokepov Page 39 of 82 Industries Serlal Dongle This kit isn t made anymore but we re keeping the documentation up anyways Enjoy but we don t have this for sale Make it Serial dongle Serial Port SookePOV Dongle Parts jl Programming Header DB 9 female connector X1 w solder cup connectors R1 R3 1 4W 5 4 7K resistors A D1 D3 5 1v Zener Diode PCB looks a little different than shown here Assembling the Serial Dongle Adafruit https learn adafruit com spokepov Industries 30310 6002HB Generic Generic Custom Page 40 of 82 Get your bench set up for soldering O Adafruit Industries https learn adafruit com spokepov Page 41 of 82 Place and solder in the 3 resistors they don t have a specific orientation iE 2 isis Sess 05939 e imc e E e rm ra ur O Adafruit https learn adafruit com spokepov Page 42 of 82 Industries P poep 9 Place and solder in the zener diodes making sure that you have the black stripe on the diode aligned with the white stripe on the PCB image Adafrui a lt https learn adafruit com spokepov Page 43 of 82 Industries Place the box header matching the notch up and the DB9 connector o
6. side of the kit with the battery connectors as shown on the left the longer leg of the LED goes in the hole along the edge of the PCB Sometimes the LEDs have the flattened edge of the plastic wrong so go with the length of the leads Longer lead goes in the hole closest to the edge of the board Solder in the 8 9 SIP resistor networks Make Sure you align them correctly one side of the resistor pack has a dot which corresponds to pin 1 which is marked with an X in the picture on f the circuit board 1 j i U a e See a PES z i te ih i a Hi nii i E pa A met a 7 wa E Ey AA ef y Se rag gt ek Adafruit l https learn adafruit com spokepov Page 30 of 82 Industries Place the one 10K resistor Bend the leads like with the LEDs and solder it in then clip the leads off SE NOCD i DEDEDE E OS BEF L Place the button which will snap into place Solder it in a PAK ie Bend the sensor so that the face points out as Shown Since the sensor has to stick out but has short leads solder it from the top making Sure that the leads don t stick too far through sm on the other side See the picture to the left et J7 gy iat eg a ah i A ih LS Pad O Adafruit https learn adafruit com spokepov Page 31 of 82 Industries Put the microcontroller in the socket so that the notches match up The sensor can lean on the microcontroller If you want you can use a bit of if oe i
7. your hub diameter Better yet measure how far the end of the attached SpokePOV is from the center of the wheel and then multiply by two to get the diameter This will define how big the white space in the middle of the wheelpanel is and will give you the most precise images Set hub diameter Enter new hub diameter size in inches Hub diameter 10 a r E Jl cance The configuration will be saved so you only have to do this once Testing the connection A big problem for people is figuring out whether there s a problem with their spokePOV dongle or software Therefore there is now a port testing feature that will help you debug the communications system using only a multimeter Dont forget take the jumper out of the USB dongle if you ve got one Otherwise your batteries will go pop Select the Test Port feature from the configuration window Adafruit https learn adafruit com spokepov Page 52 of 82 Industries M wxSpokePOV a Ed File Slate ate SE Port Type F z gt Fort pl conned Wheel Size Hub Size Test Port Make sure that you are testing the right kind of port and the correct connection Connect dongle OK connect up the dongle only to the serial pork COM1 Cancel Now go thru all the steps verifying the connection You can Test Port on the USB dongle but the pictures show the older parallel serial interfaces Just pay attention to the box head
8. B Display adapters A DYD CD ROM drives 3 Human Interface Devices 42 IDE ATAJATAPI controllers La IEEE 1394 Bus host controllers 38 Imaging devices la Keyboards ae Mice and other pointing devices Monitors Network adapters cy NVIDIA Network Bus Enumerator Ports COM amp LPT F Communications Port COMI oe Printer Port LPT1 A Processors e dla SBP2 IEEE 1394 Devices 1 4 Sound video and game controllers Se Storage volumes E 4 System devices Next select the Communcation Delay This is only really important if you re using a USB Serial adaptor These are very slow devices despite being USB so we need a higher delay For USB the delay is ignored so it doesn t matter what it s set to For parallel port as well as direct serial where the computer has a serial port right on the motherboard use a delay of 1000 uS Increase it up to 2000 US if it s being flakey Set comm delay Enter new comm pork delay Delay us PLNE Cancel For USB Serial adaptors start at 4000 uS and increase it by 1000 until you get consistant results Adafruit https learn adafruit com spokepov Page 51 of 82 Industries Set comm delay Enter new comm port delay a Delay tus 5000 Lastly select what size wheel you re using BMX 22 LEDs or MTB Road 30 LEDs M wxSpokePOV E Ed Test Port Finally set the hub size Measure
9. HD My Documents bip Computer File name biohazard bmp My Network Files of type EMP files bmp Cancel Places Open as read only You can then move the image around hand tool and resize it pull on the corner tabs holding down shift will keep the image proportional Adafruit l https learn adafruit com spokepov Page 59 of 82 Industries e E on E E a LI a T 5 E E E E E E C 1 E u 5 Cc e a CE T Y E Cc KI LI a E O un O U f O a uN Untitled Bank 2 Untitled Bank 1 HA T RTN ETA ARA A bool the hand You can now resize drag the corner boxes or move Use the image around when you re done click here Done adjusting import image Page 60 of 82 https learn adafruit com spokepov Adafruit Industries NE wxSpokePOV E Ed Fil Contig SpokePOV Soft Bank 1 Untitled Bank 2 Untitled ni LT PCC ea AORTA A HEA CT CRUE te A H i H E AN LT HRE SOR EEE a A TT Se TTT THE ATENU Rae A Sae SAR nent elit mae Me TREE om TTT TTT You can now resize drag the corner boxes or move use the hand tool the side image around when you re done click here Done adjusting import image The software tries to figure out what the image should look like but as seen above the bitmap isn t aligned perfectly To touch up the image click on pixels or click and drag to draw
10. Spoke POV is an easy to make electronic kit toy that turns your bicycle wheel into a customized display The project includes a free schematic design open software for uploading and editing stored bitmap images and a high quality kit with all the parts necessary to build your own Kits PCBs available for purchase now http adafru it dhC Specification amp Features e Can be used with road mountain or BMX wheels e 30 LEDs on each side 22 for BMX x 256 radial pixels Adafruit https learn adafruit com spokepov Page 4 of 82 Industries e Runs on 2 3 AA batteries for 10 hours or more assuming 3000mAh alkalines and 50 image coverage e Can run on rechargable NIMH AA s e Comes with high brightness red yellow green or blue LEDs e Automatically shuts off after 3 minutes e Software runs on any Mac Windows or Linux computer with USB port e Design is all through hole parts perfect for a first time kit builder e With one spoke total persistence at 15mph Two spokes 10mph Three spokes 7mph Assuming a mountain bike wheel Looks cool even if not completely persistant e Great for safe riding at night provides excellent side visibility e Playa tested Adafruit https learn adafruit com spokepov Page 5 of 82 Industries F A Q Frequently Asked Questions How does this thing work A SpokePOV is a stick of LEDs with a magnetic hall effect sensor on the outer end When a magnet passes by the
11. amp erase Now that you ve done some edits it might be good to save the image data file for later Adafruit https learn adafruit com spokepov Page 61 of 82 Industries M wxSpokePOV E ET i AES Config About SpokePoy Rotation Offset Animation Timing Open Import BMP CTRL I Save As it TER ee JALTA ee ence a a A Ar i Ry cys Mp A ecent Documents My Documents as Mi Computer Places save as type Data file dat w Cancel Now it s time to write the image data to your SpokePOV Connect the dongle to your computer parallel serial port Perform a hard reset on the SpokePOV remove and replace a battery and verify all the leds light up in order Plug the programming cable into the SpokePOV Press the reset button to make sure the SpokePOV is ready for upload Adafruit https learn adafruit com spokepov Page 62 of 82 Industries Now click on the write button and watch the ticker O Adafruit https leam adafruit com spokepov Page 63 of 82 Industries P poep 9 El wxSpokePOV File Confit SpokePOV Soft Bank 1 Untitled Bank 2 biohazard dat UH Ir AT KRETE 1 A IED rset Se EP TT TE ee AAA Tv RI Zu zu A ites Za TEF E an E e ER AA IH SUMI AL a ae di y E AA TF E Pa te et Pe T i ae a re eT a Se aa REN n we h AA a a ik
12. dentified below You can cut a trace usinga razor blade knife sharp screwdriver etc The point is to make sure the printed wire is broken If you don t cut it properly you will notice the 3rd battery gets REALLY hot when you put it in I thought I d be all smart and put a note on the PCB about which trace to cut but on some early SpokePOVs put it on the wrong side of the board If you hold it up to a bright light you ll see the trace or use this handy guide T ea a eee ee E PS BE gt Zz C E t k W Pal a PE a 7 w j If you are planning to use the kit with BMX Unicycle kid s wheels you ll need to cut down the PCB yourself You can do this with tin snips shown a hacksaw bandsaw shear etc Adafrui Greda Ka https learn adafruit com spokepov Page 12 of 82 Industries Ae Ls A i m Pe o rE e 2S ee e A A E 4 PRE TR TT A he a hea Es e he Er nee z a Ta T as a i h Ps 4 Te ame ee get O A UG Te X E a E j a ly ry Le Adafruit https learn adafruit com spokepov Page 13 of 82 Industries When assembling it just solder all the parts you can There will be 16 LEDs 2 ICs and 2 resistor packs left over Adafruit https learn adafruit com spokepov Page 14 of 82 Industries SpokePOV Parts for the SpokePOV Kit Check to make sure your kit comes with the following parts sometimes we make mistakes so double check everything and email sup
13. ee As u rene hehe ahh glue O SUPPOM la E NITI 4 Tea AS CO Place the EEPROM in the smaller socket so that the notches line up You re done Now that you re done assembling it you can test the board to make sure it s functioning Put two or three good AA batteries into the clips Whenever the microcontroller gets notice of a hard reset it goes through a little test routine where it lights up all the LEDs in order then it lights up one LED on each side of the SpokePOV to indicate that it s still on The actual LED itself will vary as it is used for debugging If none of the LEDs are lighting up go back and check to see if you put in any latches batteries or the microcontroller in backwards If just a few LEDs arent lighting up check if they re in backwards SpokePOVs now come pre programmed with some sample images You can trigger the images using a magnet sweep it past the sensor a few times and then wave it in the air you Should see a pattern displayed Can t get it working Don t worry help is available in the forums http adafru it forums Adafruit https learn adafruit com spokepov Page 32 of 82 Industries O Adafruit https learn adafruit com spokepov Page 33 of 82 Industries P poep 9 Parallel Port Dongle This kit isn t made anymore but we re keeping the documentation up anyways Enjoy but we don t have this for sale Make it Dongle SpokePOV Parallel Port Dongle Parts jl P
14. er and ignore that the PCB looks different Adafruit https learn adafruit com spokepov Page 53 of 82 Industries Passed 1 SpokePOy communication is ready to go If it worked out you should get this message Connecting Turn on the SpokePOV preferrably by hard reset removing and replacing a battery Make Sure you have recharged good batteries Plug the dongle into the SpokePOV and click on the Connect button to connect to the SpokePOV Connecting to spokePOY Attempting to find SpokePoy on serial pork TOMI PO Adafruit Industries https learn adafruit com spokepov Page 54 of 82 NE wxSpokePOV Fie Config Menubar rotation Set Toggle mirror Rotation Rotation Offset Animation Animation Timing Mirror i Mag I Tia LIF PL RHEE ne err RRE ir Fj a nyt e Pr He u a k Ad A Sao a i SELE EU 4 li PLA oa STRANE E e Ne eee p n ME an me rae n oe CO A a a a eh E a rags x aa E Bae a mr a Ma pu Ai I A TU nil ini HEE an a FAN ti i oe I ee dnu i dal NK der Teele SEK NO om i ere 3 ae ae ee sie Seti tt A AAA Ir ALE eee tr aT at ats SLE nnn un ei umber of dl d Hini wate eae aatan Hr H HTT NET re ZE SE ME sm y BEES contents Read from SpokeP Ow write to Writeto SpokePOv verify SpokePoy Once you connect you can see the graphical interface for editing wha
15. erent program and then edit it The wheel panel has one square for every pixel of resolution If you re using this with a BMX configuration the wheel will have fewer LEDs so it will appear a little different The empty spot in the middle corresponds to the hub size the space where no image appears First thing you probably want to do Is import a bitmap image There are a couple example bitmaps distributed with the software Bitmaps must be monochrome or at least grayscale The software assumes that white pixels means no LED should be on and black pixel means a LED on You ll get best performance if your bitmap is at least 600x600 pixels large Page 58 of 82 https learn adafruit com spokepov Adafruit Industries M wxSpokePOV a Ed l AGS Contig About SpokePoy Rotation Offset Animation Timing DEM Import BMF CTRL I Save Save As pul stone e gi uit CTRL A O A o T T T T eea SK i tH Pre A EAT Sen A ANIME TEE J NE Pre if E fa Ae Airy When you import a bitmap the software will automatically figure out what the image should look like The imported image will appear in the background the red lines show where the LEDs will be lit Choose an image to import Look in E Bitmaps da jE A biohazard bmp My Recent Documents Desktop
16. es 4 red yellow or6 green blue 60 Page 16 of 82 Get your bench set up for soldering Hi see yi Fi Seat oo q Miki kd silu Losas Fay Ub A irae m i h ci a ES 4 Adafruit i https learn adafruit com spokepov Page 17 of 82 Industries E a 1 MAJSOPUI ji a a E E E E e SE III PEE EE ALCA a E NITI PERERA EPES sRPRERRR EERE s o o E i CEECONN eee ECONO ECOCOAN UE Doa E E PRERFEEREE ERER Sade lee Nes Wes Ne e PrEPRPPREtteReee i a e D ICI I U a a RNI AACR BEE i F i TI ELA TE RARA 3 JR T F U LE BEBE SE lee ONO Za 4 Adafruit Industries https learn adafruit com spokepov In v1 1 two components have been added Cl and C2 These parts add power supply Stability Start by inserting C2 by bending the legs and placing it in the circuit board C2 is a polarized capacitor This means it should be soldered ina certain way and if you put it in backwards it can be damaged or even explode If you look carefully you will see a bump on one end of the capacitor and on the circuit board the printed image also has a bump Check the photo if you are not sure Page 18 of 82 Next insert C1 which is a non polarized ah i capacitor it can go in either way CEELEN I C Rh AA Bee Sa JU en TETEE U i Bend the wire leg
17. frui S Anar https learn adafruit com spokepov Page 72 of 82 Industries Now spin the wheel clockwise and stand back to see the image Turn off the lights for best results O Adafruit https learn adafruit com spokepov Page 73 of 82 Industries Using the SpokePOV There isn t much involved in using the SpokePOV If you re worried about riding it in the rain you can conformally coat the board except for the button which is waterproof and the battery clips and header Basically that means you coat the board in spray on silicone which protects it against moisture If you don t want to conformal coat I d suggest just keeping the SpokePOVs off while riding in the rain and drying them off so that the batteries don t corrode Unfortunately there does not seem to be a simple inexpensive way to make waterproof enclosures at DIY level quantities The SpokePOV has three modes off idle and display e Off mode is pretty much just off the SookePOV is consuming absolute minimal power To turn it on press the button amp it will enter idle mode Adafruit https learn adafruit com spokepov Page 74 of 82 Industries e Idle mode is a low power but active mode the SpokePOV is waiting for the wheel to spin but it s not actually displaying any images For example it was just turned on Or the wheel hasn t spun in the last few seconds The SpokePOV will display one lit LED on each side to tell you it s still on The LED it
18. ge 23 of 82 Industries Put inthe programming socket make sure to align the notch with the picture on the PCB Now turn the PCB over and hold the socket in place while you solder it in SSA 4 4 de ar aE s andres Es a mm im a i PL rra E W u MA ME JE U O Adafruit l https learn adafruit com spokepov Page 24 of 82 Industries Place the large socket as shown There s a notch in the socket which should line up with the notch in the image of the socket The notch Ro will help you align the microcontroller chip in properly Turn the board over and hold the E23 thn SU socket in with a finger tack two corners pins to pdesiies NE keep it in place then solder the rest of the pins U TN i ee um mm Ls P r 2 A ee a a r Tira aT pe Se ee He r l See Se ae ae Se Adafruit l https learn adafruit com spokepov Page 25 of 82 Industries Solder in the smaller socket just like the larger one O Adafruit https learn adafruit com spokepov Page 26 of 82 Industries p poep 9 Place the 6 top 74HC595 latches in the proper Spots making sure to align the notches on the e chip with the notches in the pictures Tack them N JA NX p mm in place by soldering two corner pins of each Lego a A one from the top Then turn the board over and eT ee Sl i solder all the pins Next do the same with the 2 latches on the reverse side Adafruit l
19. https learn adafruit com spokepov Page 27 of 82 Industries LEDs are diodes that means they only work in One direction unlike resistors That means you must put the LED in right or it won t work How do you know which way is which That s easy the LEDs have one leg that is slightly longer That leg is the anode positive leg The shorter one Is the cathode negative lead Adafruit https learn adafruit com spokepov Page 28 of 82 Industries Grab the LED back and place the first 30 into the front row Make sure the longer lead wire of the LED is in the hole ll closest to the edge of the board Otherwise the LED will not light up This is a al pretty common mistake so please work slowly and carefully Sometimes the LEDs have the F flattened edge of the plastic wrong so go with the length of the leads Longer lead goes in the hole closest to the edge of the baord When you place each LED bend the leads out so that it won t fall out when you turn the board over Solder the LEDs and clip the leads either one at _a time or all at once whichever is easiest for YOU LI II AISI I III i IEE Adafruit https learn adafruit com spokepov Page 29 of 82 Industries Repeat for the other row of LEDs On this side it can be a little tough to see which MAS W side is flattened A ne mo i KC Ta PA A nie mhi ered eee oben Hie i tare Cn sh ee AA rara 1 On this
20. ics so that they can short As you can see inthe picture below installed this SookePOV so that it is inside the wheel the spokes are all either to the side or in front where they only touch the LEDs which is OK they re plastic When you clip the zipties make sure to leave a little tail if you cut them too short they are more likely to fail Use zip ties available at any hardware crafts office store to attach the SookePOV to the Spokes Adafruit https learn adafruit com spokepov Page 66 of 82 Industries O Adafruit Industries https learn adafruit com spokepov Page 67 of 82 O Adafruit Industries https learn adafruit com spokepov Page 68 of 82 O Adafruit Industries https learn adafruit com spokepov Page 69 of 82 O Adafruit Industries CCGG L al Fi A E El T U 4 cd i https learn adafruit com spokepov Page 70 of 82 O Adafruit Industries acer La 3 Gu zat gt e ME me i https learn adafruit com spokepov Page 71 of 82 Attach the magnet to your frame If you have a steel bike this is really easy You want to make sure that the south side of the magnet is facing out since the sensor is sensitive to the south side only Try to put the magnet as close to the sensor as possible Press the button to turn on the SpokePOV and try moving the wheel back and forth around the magnet you should see the LEDs start to blink Ada
21. images Since SpokePOV is double sided you can have the image on the opposite side either be mirrored so that it looks backwards on the opposite side or not so it appears exactly the same on both sides For example if you have text you want to display the image should not be mirrored However if you want an arrow that points in the direction you re biking then you want it to be mirrored When you start up and connect the wheel panel is empty You can click and drag in this window to draw pixels O Adafruit https learn adafruit com spokepov Page 57 of 82 Industries Seles M wxSpokePOV File Config SpokePOV Soft Bank 1 Untitled Bank 2 Untitled nares We ILI 111 TE A Ner AI 1i y AL EDIT Para Ez E Al 4 Hae he Ta r aul PT ee UCT Hea arate E Ty rue KURT dr AA AA Ai Aa re ee ac UNUNG MIN Pia wi H bor ane j illj il LI UNE JEF if ru U 1 u Hi HIT i Hi i rift ry rea eat ET Paty ape a AER PERN oa te ate is Me ue E U ie Ste ty ire He cat ie nits A LI y Aa aoe A aa A ATA cea A Cyaan avian Un eo o 1 UL EN j Hi ate i AU LILA A PA ire ITH ri az Ta ra pare TT aU e e H porem pinta es ae Are E TI CA CA E HTHH RT E HEr EE ie Write to SpokePoy verify SpokePoy Read from SpokePoy This is a very Slow process as the software isn t very fast it s better to import a bitmap omp file from a diff
22. ion timing which is how many wheel rotations the spokePOV will spend at each animation frame before going to the next bank The images are stored in the 25Cxx EEPROM each image takes 1Kbyte of storage Therefore a 1K EEPROM 25C08 will store one image a 2K EEPROM 25C16 will store two and a 25C32 will store four 1 The firmware in the microcontroller automatically goes through the EEPROM showing each image without knowing how large the EEPROM is Therefore you can swap out a different EEPROM at any time you want 2 This also means that you have to fill all the banks with something You can t just upload an image to the first bank and nothing to the other three or the spokepov will display nothing for 3 out of the 4 animation cycles 3 You can sync all the spokepovs by quickly resetting them before you start 4 Animation doesn t work great but it does work One way to improve it may be assuming you have more than one spokepov to leave out the hall effect sensor on all but one and wire the ground and sense wire but not the VCC power wire all together so that they are forced to sync together You ll have to mess with the offset value though O Adafruit https learn adafruit com spokepov Page 56 of 82 Industries Set animation timing Enter new animation Frame timing That is how many wheel rotations should each frame take before the next one is displayed E anos 0255 There is also a toggle for mirroring the
23. l effect sensor You can read about how these things work over at sensorland http adafru it dhQ When the southside of a magnet comes close the the front of the sensor it sends a pulse to the microcontroller Button The button is completely waterproof Press the button for less than a second to reset the SpokePOV or turn it on if it s off Hold down the button for 2 seconds and release to turn the SpokePOV off EEPROM The EEPROM electrically erasable programable read only memory stores the image to be displayed Since there are 32 LEDs 4 bytes and 256 radial pixels 1K of storage is needed A larger eeprom could be used to display higher resolution images or animations etc To write the image data to the eeprom a parallel port dongle is connected to the board and the SpokePOV software is used Batteries The default configuration Is 2 x AA batteries Alkaline batteries are best and will last a lot longer However I ve found rechargable NiMH batteries work pretty well To figure out approximately how long your batteries will last use this equation mAh in batteries LEDs on 60 LEDs 10mA per LED So for example if you have 2000mAh AA rechargables and about 1 4 of the LEDs are on in a picture then it should last about 13 5 hours of constant lit up use If you want to use some other sort of battery pack or not use the clips you can solder your wires to J1 which connects directly to power You could also connec
24. me I O L sl s Na Pre apie PETE TEE in SANTO Sats take A A ARCA ore E ae e E Read from SpokePOv Write to SpokePoy verify SpokePoy If all is well the window will show the address incrementing and the LEDs on the SpokePOV will blink to show the progress There are 1024 addresses it should take 30 60s to write a full image If you are using a USB serial converter it may be much longer You can manipulate the Comm delay to make it longer less flakey or shorter faster You can also use the Read or Verify buttons to verify the contents or read from the SpokePOV image bank into the panel Even if you only want to display 1 image the SpokePOV will always go through all the banks So if you have 4 you must upload the same image to all four banks Can t get it working Don t worry help is available in the forums http adafru it forums Adafruit https learn adafruit com spokepov Page 64 of 82 Industries O Adafruit https learn adafruit com spokepov Page 65 of 82 Industries P poep 9 Install User Manual Installing your SookePOV Once you ve built and tested http adafru it dhN your SookePOV and uploaded an image http adafru it dhO you can install it on your bike wheel The easiest place to install on a wheel is one of the large gaps between spokes Your bike wheel may be a little different The most important thing is that you don t install it so that the metal spokes scrape against any electron
25. microcontroller takes note By counting how long it takes between magnet passes SpokePOV can tell how fast it s rotating and quickly blink the LEDS to present an image Therefore no matter how fast you are riding the image will show up correctly Why is there a random LED lit on either side of the SpokePOV One LED is lit on both sides to indicate that the SpokePOV is on The LED itself may vary as it is also used to debug the SpokePOV What colors are available Can put my own colors in Right now kits are available in red yellow green and blue You can use your own LEDs just buy 60 5mm 2000mcd or higher LEDs and possibly vary the resistor packs to fit your LEDs and number of batteries this may take some experimentation Why don t you have full color SpokePOVs While full color POV is really cool looking http adafru it dhD it s also fabulously expensive to make a 60 LED SpokePOV full color it would cost 5x as much Will SookePOV fit my wheel SpokePOV can fit either BMX 20 wheels or mountain roadoad bike 700c 37 wheels The short version is 6 5 16 5cm long the longer version is 9 23cm If you are using BMX wheels simply cut the PCB http adafru it dhE before soldering in parts and then don t solder in the extra LEDs or latches How fast do have to pedal On a mountainbike wheel have found that with 1 SookePOV you should bike L5mph 24kph With 2 SookePOV bike LOmph 16kph With 3 SookePOVs 7mph 11kph
26. n the edge of the PCB Solder both making sure that you get solder underneath the pins of the DB9 a ga ra S ES a E A A A de etl ane gt a e e y a a Adafruit https learn adafruit com spokepov Page 44 of 82 Industries 7 Ok you are done O Adafruit httos learn adafruit spok P 45 of Industries p uit com spokepov age 45 of 82 USB Dongle Make it Serial dongle USB Port SpokePOV Dongle Instructions The USB dongle Is actually a dual use kit and the instructions live over here at the USBtinyISP page http adafru it dhl Follow those instructions to assemble it but use the windows driver available on the SpokePOV download page http adafru it dh it s actually an identical driver only difference is that the name will appear as SpokePOV dongle instead of USBtinyISP You don t need to assemble or use the 6 pin cable as the SpokePOVs use the 10 pin cable only Using the USB dongle Don t forget Remove the jumper when attaching it to a SpokePOV dongle and put batteries into the SpokePOV to talk to it and upload images Make sure you re running the SpokePOV software version 1 3 or higher with USB support for Mac and Windows You can Test Port on the USB dongle but the pictures show the older parallel serial interfaces Just pay attention to the box header and ignore that the PCB looks different O Adafruit https learn adafruit com spokepov Page 46 of 82 Indust
27. o borrow or purchase them They are very very handy whenever assembling fixing modifying electronic devices I provide links to buy them but of course you should get them whereever is most convenient inexpensive Many of these parts are available in a place like Radio Shack or other higher guality DIY electronics stores Soldering iron Any entry level all in one soldering iron that you might find at your local hardware store should work As with most things in life you get what you pay for Upgrading to a higher end soldering iron setup like the Hakko FX 888 that we stock in our store http adafru it 180 will make soldering fun and easy Do not use a ColdHeat soldering iron They are not suitable for delicate electronics work and can damage the kit see here http adafru it aOo Click here to buy our entry level adjustable 30W 110V soldering iron http adafru it 180 Click here to upgrade to a Genuine Hakko FX 888 adjustable temperature soldering iron http adafru it 303 Adafruit https learn adafruit com spokepov Page 8 of 82 Industries Solder You will want rosin core 60 40 solder Good solder is a good thing Bad solder leads to bridging and cold solder joints which can be tough to find Click here to buy a spool of leaded solder recommended for beginners http adafru it 145 Click here to buy a spool of lead free solder http adafru it 734 Adafruit htt
28. ooking like a persistent enduring image That s why it s called persistence of vision or POV for short Schematic Adafruit https learn adafruit com spokepov Page 76 of 82 Industries l j i 4 pi de ER F EAS a a ae ae a a E ale e E a Le EE rl k de 5 ig Dy i ke i i 4 04 2006 17 00 29 Date Lg 1 0 Hip ww lacdynda aghinakeapokepey F ma REW Document Number i hy spokepov TITLE Ta Distributed under Crontivo Commons attrib eharc alike y Herentives ory w By E As E A a http fcrentivecommons orgficensestby 3 1 4 Microcontroller The microcontroller used the ATtiny2313 is one of my personal favorites It s very low cost has an 8MHz internal clock runs as low as 1 8V and has a bunch of pins The microcontroller handles the button presses sensor pulses and reading data from the EEPROM into the latches When the microcontroller detects that there haven t been any sensor pulses in a few seconds it powers down the LEDs When there haven t been any pulses in a few minutes the board goes into power down mode the sensor is turned off and the microcontroller is barely running To turn it back on a button press sends a signal to the microcontroller to let it know it s time to wake up and turn on the sensor Adafruit https learn adafruit com spokepov Page 77 of 82 Industries Sensor The sensor is a particularly sensitive unipolar hal
29. port adafruit com if you need replacements Picture IC1 IC2 IC2 IC3 IC1O X1 S1 Adafruit Industries Microcontroller Pre programmed when purchased as part of a kit 20 Pin Socket 4 Kbyte EEPROM 8 Pin Socket Serial to Parallel latch Hall effect sensor Waterproof Switch Name Description Part ATtiny2313V 10PU Generic 25LC320 CAT25320 or AT 25320 4K SPI EEPROM Generic 74HC595 DN6852 Or US5881 SKQBAKA010 Or SKQBALAO10 Distributor Qty Digikey Mouser 1 or Adafruit programmed Mouser 1 Digike y Digike y 1 Mouser Mouser 1 Digike y Mouser 3 Digike y Digike y 1 Mouser 1 https learn adafruit com spokepov Page 15 of 82 Programming 30310 6002HB Mouser Header Digikey Mouser AA battery clips Keystone 92 Ai ay Cl O 1uF ceramic Gerent capacitor C2 SUPO ad Generic Digikey axial capacitor 1 4W 5 10K CB R1 resistor brown Generic black orange 33 39 ohm for 27 ohm yellow LEDs Digikey Mous er 10 pin bussed 33 39 ohm for 39 ohm RN1 Bb esieror red LEDs Digikey Mouser RN8 evo 56 or68ohm 56 ohm for blue LEDs Digikey Mouser 56 or68ohm 68ohm for green LEDs Digikey Mouser a LED1 LED High Brightness LEDshoppe LED60 5mm LED ABCtronics Silkscreened PCB Custom Adafruit SpokePOV Kit Assembly Instructions Adafruit https learn adafruit com spokepov Industri
30. ps learn adafruit com spokepov Page 9 of 82 Industries Multimeter You will need a good quality basic multimeter that can measure voltage and continuity Click here to buy a basic multimeter http adafru it 71 Click here to buy a top of the line multimeter http adafru it 308 Click here to buy a pocket multimeter http adafru it 850 Adafruit https learn adafruit com spokepov Page 10 of 82 Industries P POKEP J Flush Diagonal Cutters B You will need flush diagonal cutters to trim the wires and leads off of components once you have soldered them in place Click here to buy our favorite cutters http adafru it 152 Solder Sucker Strangely enough that s the technical term for this desoldering vacuum tool Useful in cleaning up mistakes every electrical engineer has one of these on their desk Click here to buy a one http adafru it 148 Helping Third Hand With Magnifier Not absolutely necessary but will make things go much much faster and it will make soldering much easier Pick one up here http adafru it 291 Adafruit httos learn adafruit com spokepov Page 11 of 82 Industries P P p J SpokePOV Assembly Prep Before you Start if you have blue green white or purple LEDs you will have to add a third battery To do that purchase 2 more battery clips from Mouser or if you have a kit they are included Before you solder them in you MUST cut the trace i
31. ries O Adafruit https learn adafruit com spokepov Page 47 of 82 Industries p pokep 9 Customize Use it Upload images Introduction The SpokePOV software allows you to easily upload download verify manipulate fold Spindle etc your SookePOVs The software is written in C and is available as a Windows MacOS X executable download here http adafru it dh Note Some people report it doesn t work on Intel Macs will try to get this fixed soon and update the software The older wxPython version documentation is here http adafru it dhL Don t forget Even if you only want to display 1 image the SpokePOV will always go through all the banks So if you have 4 you must upload the same image to all four banks Don t forget take the jumper out of the USB dongle if you ve got one Otherwise your batteries will go pop Configuring For windows users download the zip file and uncompress it Somewhere convenient If you are using the parallel port download and run install giveio from the Download http adafru it dh page to let the software talk to the parallel port For MacOS X download the SpokePOV dmg and copy the application to somewhere convenient Now start up the software You will see a blank screen there are menus and a connect button Don t connect yet you must first configure the port Adafruit https learn adafruit com spokepov Page 48 of 82 Industries M wxSpokePOV File Contig
32. rogramming Header DB 25 male connector X1 w solder cup connectors R2 R4 1 4W 5 1Kresistors R1 1 4W 5 47 ohm resistor SpokePOV Dongle Assembly Instructions O Adafruit https learn adafruit com spokepov Industries 30310 6002HB Generic Generic Custom Page 34 of 82 Get your soldering iron hot and put the small circuit board in a holder if you have one O Adafruit https learn adafruit com spokepov Page 35 of 82 Industries P poep 9 ee ARR Do oe EF Up 2 ee a eo 2 E E u Adafruit Industries Slip the DB 25 socket onto the edge of the PCB By SO that the pads line up with the solder cups Eski Now solder all the pads Make sure you heat EA 4 A both the pad and cup and that they are Y soldered together it s easy to not hit both https learn adafruit com spokepov Page 36 of 82 eS RB RE AUE Flip the board over and do the same on the other side SEA See A ee oe Put in the jumper header make sure the notch matches inthe picture and solder it in y FETTER Adafruit https learn adafruit com spokepov Page 37 of 82 Industries Place the resistors in solder and clip the leads ERMITA NAT E mm ae gt A gt Pea Lr r 1 J ASADA SS Adafruit https learn adafruit com spokepov Page 38 of 82 Industries Put the jumper into the header OK you re
33. s of the capacitors and turn the PCB over in the vice Now you can solder the parts in a ii i i a OM Kd MM O La C E T E is i Adafruit l https learn adafruit com spokepov Page 19 of 82 Industries Use your trusty soldering iron to solder each of the 4 wires to the round pads r GE um mm MA KU 2 5 TEG GRRE TT E pn E KU u mu om U A amp HESSEN EM EM IM ir itr EM EM E U l Nh A ERA SEE 11 al Y a y ay P i i iki AS hoa Ale f F F gt a e Z yl U ma L Adafruit l https learn adafruit com spokepov Page 20 of 82 Industries Use diagonal cutters to clip the excess wire cut close to the end of the solder point U LE GO os A z 3 T S SSSR RP ee ae Adafruit l https learn adafruit com spokepov Page 21 of 82 Industries Place the 4 battery clips in the top two battery positions as shown Tack them in place with solder so that when you turn the board over they won t fall out AAA CS AN Jo mi Adafruit https learn adafruit com spokepov Page 22 of 82 Industries P poep 9 Now turn the board over and solder the outer tabs of the clips first and then resolder the I inner tabs Make sure there s plenty of solder X these connections are not just electrical Hi they re mechanical too AA Sono F LE LR i cen EN S Anar https learn adafruit com spokepov Pa
34. self may vary as it is also used to debug the SpokePOV If the SpokePOV doesn t receive any magnet signals in a few minutes it will turn itself off to conserve power e Display mode is when the SpokePOV is receiving magnet signals and is displaying the stored image This mode is probably what you bought the kit for If it doesn t get any magnet signals for a few seconds it will go into idle mode The only interface to the SpokePOV is a single button It works rather simply Press the button quickly to reset the SpokePOV or turn it on if it s off Press and hold the button for two seconds and then release to turn it off If the SpokePOV is on there will be at least one LED lit If the SpokePOV is off there will be no LEDs lit and it will not respond to the magnet until turned on Adafruit https learn adafruit com spokepov Page 75 of 82 Industries Design Hardware design Intro SpokePOV works kinda like a cross between a LED propellor clock http adafru it dhP and a bike odometer Like the odometer there is a hall effect sensor and a magnet Every time the magnet passes by the sensor the sensor sends a pulse to a microcontroller The microcontroller counts the time between pulses and uses that information to turn on the LEDs so that as the wheel rotates the LEDs are always lit in the same location Because the LEDs are really bright we see a streak when they move Since they re moving really fast the pattern of LEDs ends up l
35. t image will be displayed The wheel panel shows a simulated image of what is in the SpokePOV The main controls for the SpokePOV are in a panel below the wheel panel The three buttons are used to 1 write the image currently in the wheel panel to the connected SpokePOV 2 read the image currently in the connected SpokePOV into the wheel panel and 3 verify that what s in the wheel panel is also what s in the SpokePOV There are also 3 controls up top these are configurations for the entire SpokePOV The rotation offset control allows you to change what the offset from O is What this means is when you upload an image you ll do it right side up That means that the SpokePOV starts displaying from the top rotating clockwise However you re likely to put the magnet not at 12 o clock but rather somewhere else depending on whether you put the magnet on the fork or chainstay etc Here is a diagram of where these frame parts are O Adafruit l https learn adafruit com spokepov Page 55 of 82 Industries located http adafru it dhM and some rough numbers you can start with The numbers range from O to 255 starting at the top and rotating so that 255 is right next to O again DON Location DValue Fork 220 Chainstay 64 Seatstay 32 Set Rotation Offset Enter new rotation offset This will depend on where the magnet is placed in respect bo up See the website for some suggested values ttn 0255 You can also set the animat
36. t multiple SpokePOVs together this way and share one set of batteries Note that your battery life will be a lot shorter and also there may be so much current draw that the batteries can t really handle it like if all the LEDs are on YMMV LEDs The LEDs used are high brightness 2000mcd red 5mm LEDs If you want to use green blue purple white etc LEDs you ll have to install a third set battery clips and also cut a trace on the PCB You may also have to use different value resistors For example if you want to use green LEDs and the datasheet says they have a forward voltage of 3 2V it s usually 3 3 5V and you re using 3 alkaline batteries with a nominal voltage of 1 5V each the resistors should be 3 1 5V 3 2V 0 5V 01 80 ohms The 5V drop is from the internal latch offset and 01 is TOMA which is usually about how much you want going through the LEDs Smaller resistance values brighter LEDs but more power draw If you re using 3 rechargables you can try using the smallest resistor values you can get 10 ohms O Adafruit https learn adafruit com spokepov Page 78 of 82 Industries If you want to use yellow amber orange LEDs you won t need to put a third battery in since almost all of these have a forward voltage of 2 3 or less Programming header The 10 pin header is used to upload images to the SpokePOV board and set variables see the Software page for details and can also be used to upload new firmware
37. t says SpokePOV Dongle http adafru it di0 when its plugged in otherwise identical C Software Yay have rewritted the code to be much faster and much better with fewer errors and timeouts and nicer image handling Please try it e Version 1 4 with USB support for Windows http adafru it eje e Version 1 4 for MacOSX is here http adafru it efb e v1 3 messed up serial support let me know if you have any problems should be fixed now Thanks e Version 1 2 for Serial Parallel Windows MacOS X http adafru it di1 older version not suggested e giveio exe http adafru it di2 the windows software that allows spokepovsoft and other programs to access the parallel port necessary if you use the parallel port dongle available for download from the pyParallel project on sourceforge One thing to note with the Mac version and serial dongle is that it may detect more than one port for a single USB device Say dev cu KeySeriall as well as dev cu USA19H1b1P 1 try both as I ve gotten better results with one over the other wxPython Software You can try this stuff but it is old it wont work nearly as well as the stuff above include it for your amusement only e Zip file of v1 2 http adafru it di3 for Windows users now with serial support e DMG of v1 2 http adafru it di4 for MacOS X users for use with a usb senal converter If you re using the PL2303 chipset usb adaptor on a MacOS X machine do
38. wnload this driver http adafru it aTU and install it NOT the one that comes with the device e giveio exe http adafru it di2 the software that allows python and other programs to access the parallel port necessary available for download from the pyParalle project on sourceforge e Justthe v1 0 python script config file and sample bitmap http adafru it di5 for Linux FreeBSD etc users You ll have to also have Python 2 4 wxPython and pyParallel installed O Adafruit https learn adafruit com spokepov Page 81 of 82 Industries Firmware e V1 01 avr gcc firmware and intel hex file http adafru it di6 A hacked version of the v1 01 firmware that blinks all the LEDs when the bike is stopped http adafru it d17 Hardware e High rez PNG of schematic http adafru it di8 e Latest EagleCAD schematic http adafru it di9 and board file http adafru it dia Adafruit Industries Last Updated 2014 12 27 11 45 21 AM EST Page 82 of 82
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