Pololu - Pololu Wixel Shield for Arduino User's Guide
Contents
1. in which you can construct your own circuits The holes in this prototyping area are connected in a breadboard like configuration as indicated by the top silkscreen The traces connecting the prototyping holes are located on the bottom side of the shield and can be cut if a particular connection is not desired Arduino Reset Button User LED and Pins Since the shield covers the Arduino s reset button and user LED the shield makes parallel versions of these components accessible on the shield itself The shield features an Arduino reset button and a yellow LED connected to Arduino pin 13 The shield pin spacing along the sides matches the standard irregular Arduino pin spacing but these pins are additionally broken out to neighboring columns that are on a 0 1 grid All square pads on the shield are ground 1 Overview Page 3 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation Voltage Dividers The shield has four general purpose 2 3 voltage dividers that can be accessed by the lower HV and LV pins pictured above located between the Wixel socket pins These voltage dividers can be used to safely connect 5 V outputs to the Wixel s 3 3 V inputs connect the 5 V signal to one of the four HV pins and then connect the corresponding LV pin to the Wixel pin of your choosing The voltage dividers are not connected to anything by default MOSFET Circuits The shield has two general purpose M2. mn mE bd ser Arduino s traditional wired USB connection can still be used while ma oT 516 META Jal the shield is connected A schematic of the connections between the pere ic ae vn pi 3 Arduino and the Wixel shield is available in Section 1 d More og en le information on wireless sketch uploading is available in Section 2 c General Purpose Wireless Serial The Wixel shield makes general purpose wireless serial communication easy Arduino serial functions such as Serial print will transmit data wirelessly from the shield s Wixel to a remote Wixel that then relays the information to the computer or embedded electronics to which it is connected Similarly data from the remote Wixel will be transmitted to the Wixel shield and can be read by Arduino functions like Serial read This enables wireless sketch debugging using the Arduino serial monitor wireless communication between custom PC software and your Arduino wireless communication between multiple Arduinos and more HETTY LANA rele amp eleTe slele elle ls o e e e e s TOO CEEE IO J J Jj le elelo elele eres e e erare elele s e s e eJo s eJo s s Je s m a O E ia h Me E T 2 B la e mi a a bi i ie amp TEENE tE O Ano EDSSo GOD AAA Wixel shield for Arduino top view Prototyping Space The unused portions of the Wixel shield are configured as general purpose prototyping space
3. the included male headers as shown in the picture below 2 Getting Started Page 9 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation Once the male header pins are installed the Wixel can be plugged into the female socket on the Wixel shield You can skip this step if you purchased a fully assembled version of the Wixel http www pololu com catalog product 1336 2 c Configuring the Wixels Before your Wixels will work with the Wixel Shield for Arduino they need to be programmed with a compatible app The Wixels do not ship with an app on them so you will need to configure them using the Wixel Configuration Utility on a Windows computer The Wixel User s Guide http www pololu com docs 0J46 contains instructions for downloading installing and using the Wixel Configuraiton Utility Wixel Shield App The quickest way to get started with your Wixel shield is to load both Wixels with our open source Wixel Shield app http www pololu com file download wireless serial v1 3 shield wx1 file_id 0J485 25k wxl This special version of the Wireless Serial app which is documented http www pololu com docs 0J46 9 b 1n the Wixel User s Guide creates a wireless serial link between two Wixels and enables wireless Arduino sketch uploading using the standard Arduino computer software in addition to general purpose wireless communication The app has two configuration parameters radio channel and baud_
4. A soldering iron and solder The through hole parts included with the Wixel shield must be soldered in before you can plug the shield into an Arduino or plug a Wixel into the shield An inexpensive soldering iron http www pololu com catalog product 156 will work but you might consider investing in a higher performance soldering iron http www pololu com catalog product 1625 1f you will be doing a lot of work with electronics See Section 2 b for more information on assembling the Wixel shield e A desktop or laptop computer You will need a personal computer for configuring the Wixels and using the Arduino Software Currently the Wixel Configuration Utility the software used to configure the Wixels only works under Windows but once configured the Wixels should work with Windows Linux or Mac See Section 2 c for more information on configuring the Wixels for use with the Wixel shield 9 We offer a combination deal http www pololu com catalog product 2501 that consists of a Wixel shield two Wixels and a USB A to mini B cable 2 b Assembly The Wixel shield ships with all of the surface mount parts populated However soldering is required for assembly of the included through hole parts The following through hole parts are included with the Wixel shield 2 Getting Started Page 8 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation e two extended 1x8 female headers for Arduino shields e two e
5. OSFET circuits that can be accessed by the upper HV and LV pins pictured above located between the Wixel socket pins These circuits can be used as inverters level shifters e g to convert a 3 3 V Wixel output to a 5 V signal or for driving larger loads up to 200 mA than you can with a Wixel or Arduino I O pin alone e g high current LEDs or relays The MOSFET circuits are not connected to anything by default The circuit incorporates a BSS138 MOSFET N channel 50 V 200 mA 1 5 V maximum gate threshold voltage 1 Overview Page 4 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation Pushbuttons The shield has space near the pin 13 LED that can be used for two general purpose pushbuttons http www pololu com catalog product 1400 The pushbutton pins are brought out to a series of through hole pads that you can connect to other parts of your circuit One easy way to add user input pushbuttons to your Arduino is to jumper the upper pushbutton pin to the neighboring ground pad and connect the lower pushbutton pin to the Arduino or Wixel I O line of your choosing with that line s internal pull up enabled In this configuration the line is high by default and it is driven low when the button is pressed Wixel Socket The shield relies upon a pair of Wixels for its wireless connection The shield s Wixel socket allows the Wixel to be removed and used for other applications 9 Note The
6. Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation Pololu Wixel Shield for Arduino User s Guide Mora IIA EEA ERE EEE OE Se bow ees 2 La Contacting POlOML ion otrora eee Oe eee eee a ee ew ee ee a 3 1 5 Smeld Feat res uu sesos oh eee BEG EA ee bee eee A 3 l c Arduino Pin Usage un cb cg eae enw PER eee Ra Ew Eww eee Kee Pew ee ees eS 5 Ld Schematic Diagram ss s e sasae aa adaa a a aa a aeea i 6 Le DIMENSIONS gasek oe ea ee Re ee ee ae a aaa AR 7 A IEEE III 8 2 a What You Will Need cocino A A oe 8 IO IEEE 8 20 Configuring the WIXGlS p sas seras das AE ee ee SE ee 10 2 4 Connecting the Shield 2422504256 pr rro ra 11 2 e Using the Arduino Software 0 a a a 11 2 f Writing Sketches for the Wixel Shield 12 http www pololu com docs 0J47 Page 1 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation 1 Overview The Wixel shield http www pololu com catalog product 2500 seamlessly enables a wireless link with a typical range of 50 feet to replace your Arduino s USB interface which means you can use the standard Arduino computer software to e wirelessly program the Arduino e wirelessly debug sketches with the Arduino serial monitor e wirelessly communicate with the Arduino from your computer s virtual COM port More generally the shield can also be used for wireless communication between an Arduino or Arduino clone and other emb
7. above features make the Wixel shield a good general purpose prototyping board for Wixel projects An Arduino is not required to use this board as a Wixel development platform 1 c Arduino Pin Usage The Wixel shield connects to these pins on the Arduino e Pin 0 RX e Pin 1 TX e Pin 13 user LED e RESET e 5V e GND The shield uses the Arduino s 5 V regulator to power the socketed Wixel It is safe to use this shield in conjunction with other Arduino shields or electronics that also use these pins though such electronics could potentially interfere with the operation of the Wixel shield and vice versa For details about the connections see the Wixel shield for Arduino schematic in Section 1 d 1 Overview Page 5 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation 1 d Schematic Diagram Wixel Shield for Arduino Schematic 2 3 voltage divider general purpose MOSFET pushbutton space biPololu You can also download the Wixel shield for Arduino schematic http www pololu com file download wixel shield schematic pdf file_id 0J483 39k pdf 1 Overview Page 6 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation l e Dimensions The shield board dimensions are 2 02 x 2 56 within the profile of the standard Arduinos When the shield with a socketed Wixel is plugged into an Arduino Uno the entire assembly is 1 3 tall With the socket
8. aking your own Wixel apps http www pololu com docs 0J46 10 in Section 10 2 d Connecting the Shield As with most electronics it 1s good to avoid making connections while circuits are energized Therefore we recommend that your Arduino be unpowered and disconnected from USB when plugging or unplugging the shield from it The same goes for the socketed Wixel After all of the connections between the Wixel shield and Arduino are secure the Arduino can safely be powered through the power jack or USB It is safe to connect the socketed Wixel to your computer through USB but the Arduino will not receive power through that connection 2 e Using the Arduino Software Using the Arduino software with the Wixel shield for Arduino 1s not any different than using it normally except that you will be programming on the COM port associated with a Wixel rather than one associated with your Arduino In the Arduino IDE select your Arduino board using Tools gt Board and select the the COM port that corresponds to the Wixel connected to your computer using Tools gt Serial Port The upload button and the serial monitor will now work exactly like they do when your Arduino 1s directly connected to your computer via USB 2 Getting Started Page 11 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation 2 f Writing Sketches for the Wixel Shield Writing sketches for the Wixel shield is as easy as using the standard serial li
9. brary to transmit and receive serial data Note that when first enabling the serial port you might receive an invalid serial byte as a result of noise on the serial lines You can keep the Wixel from receiving this noise byte by delaying for ten milliseconds before and after calling Serial begin like this delay 10 Serial begin 115200 change this baud rate to the baud rate you set on your Wixel delay 10 Example Serial Communication Sketch Here is a sketch based off of the example physical pixel sketch http www arduino cc en Tutorial PhysicalPixel that demonstrates wireless serial communication between an Arduino and a computer const int ledPin 13 the pin that the LED is attached to int incomingByte a variable to read incoming serial data into void setup initialize serial communication delay 10 Serial begin 115200 NOTE change this baud rate to the baud rate you set on your Wixel delay 10 Serial println Wireless Physical Pixel Serial println Send H to turn on the LED and L to turn off the LED initialize the LED pin as an output pinMode ledPin OUTPUT void loop see if there s incoming serial data if Serial available gt 0 read the oldest byte in the serial buffer incomingByte Serial read if it s a capital H ASCII 72 turn on the LED if incomingByte H digitalWrite ledPin HIGH Serial println LED is on f
10. ed Wixel but without the extended 1x8 and 1x6 shield headers the shield itself is 0 8 tall Since the height of the Wixel and its socket 1s taller than the typical available clearance between shields we recommend using the Wixel shield as your Arduino s top shield The mounting holes are 1 7 apart and 0 125 in diameter suitable for 4 screws http www pololu com catalog product 1962 1 Overview Page 7 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation 2 Getting Started 2 a What You Will Need The following materials are necessary for getting started with your Wixel shield for Arduino http www pololu com catalog product 2500 e An Arduino Using this product as an Arduino shield rather than a general purpose Wixel prototyping board requires an Arduino Wixel shield should work with all Arduino and Arduino clones that have the standard Arduino pinout and use a serial bootloader We have specifically tested 1t with o Arduino Uno http www pololu com catalog product 1616 o Arduino Duemilanove with ATmegal68 o Arduino Mega 2560 http www pololu com catalog product 1698 o chipKIT Max32 Arduino Compatible Prototyping Platform PIC32 based Arduino clone e Two Wixels A pair of Wixels http www pololu com catalog product 1337 make the wireless link that the shield relies on e A USB A to mini B cable You will need a USB A to mini B cable to connect your Wixels to your computer e
11. edded systems including additional Arduinos Alternatively this board can also be used without an Arduino as a general purpose Wixel http www pololu com catalog product 1337 prototyping board 9 The Wixel shield does not interfere with the Arduino s existing USB circuitry so the Arduino s traditional wired USB connection can still be used while the shield is connected Wireless communication requires a pair of Wixels http www pololu com catalog product 1339 which are sold separately or as part of a Wixel shield combination deal http www pololu com catalog product 2501 Neither the Wixel shield nor the shield combination deal include an Arduino http www pololu com catalog product 1616 Example Applications The Wixel shield for Arduino opens the door for many new Arduino projects Here are just a few project ideas Program debug fine tune and control your Arduino based robot without having to touch it Stream data from a remote sensor e g your outdoor weather station to your computer or Arduino Build a wireless remote control for your Arduino project Maintain projects installed in hard to reach places or places where wires and cables would be impractical Enable communication among a swarm of Arduino based robots or a field of interactive elements requires additional Wixel development Use the Wixel as a secondary parallel processor to add more computing power I O lines and hardware peripherals t
12. f LE it s an L ASCTI 76y turn off the LED if incomingByte L digitalWrite ledPin LOW Serial println LED is off If you paste this code into an empty sketch you should be able to wirelessly upload it to your Arduino and use the serial monitor to communicate with your Arduino In the serial monitor you should see instructions for how to use the sketch 2 Getting Started Page 12 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation Wireless Physical Pixel Send H to turn on the LED and L to turn off the LED LED ia on LED is off Serial monitor connected to an Arduino running the Wireless Physical Pixel sketch 2 Getting Started Page 13 of 13
13. o your Arduino requires additional Wixel development Advanced users can write programs for their Wixels http www pololu com docs 0J46 10 to make use of the its 12 free general purpose I O lines including 5 analog inputs or to develop more complex wireless communication networks 1 Overview Page 2 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation 1 a Contacting Pololu Thank you for your interest in the Wixel Shield for Arduino http www pololu com catalog product 2500 If you need technical support for this product or have any feedback you would like to share you can contact us http www pololu com contact directly or post on our forum http forum pololu com viewforum php f 30 We would also be delighted to hear from you about any of your projects and about your experience with the Wixel shield Tell us what we did well what we could improve what you would like to see in the future or anything else you would like to say Wixel shield for Arduino 1 b Shield Features powered through its power jack communicating wirelessly with Wireless Sketch Uploading eee Wixel The Wixel shield connections allow it to duplicate the functionality of the Arduino s USB circuitry which means the shield can wirelessly ge E program the Arduino using the standard Arduino software These a Ter le Wixel gt connections do not interfere with the Arduino s USB interface so the E F
14. rate Both Wixels need to use the same radio channel and the baud_rate needs to be set to the specific upload speed bootloader baud rate for your Arduino as shown in the table below Other baud rates will work for serial communication but they will not work for wireless Arduino programming Arduino board name Upload speed baud_rate Arduino Uno 115200 Arduino Duemilanove w ATmega328 57600 Arduino Diecimila or Duemilanove w ATmegal68 19200 Other Use upload speed parameter in Arduino boards txt file Making Your Own Compatible Apps Compatible apps at a minimum must do two things relay serial communication and reset the Arduino when the Arduino software signals a reset To accomplish this they should use the following three Wixel pins 2 Getting Started Page 10 of 13 Pololu Wixel Shield for Arduino User s Guide 2001 2011 Pololu Corporation e PO 0 the Arduino is held reset while this pin is high e Pl 6 Wixel TX Arduino RX e P1 7 Wixel RX Arduino TX The other 12 general purpose I O pins including 5 analog inputs are free to be used by your app to interface with the Arduino or other electronics A good starting point for making your own compatible app is to modify the source code for the Wireless Serial App http www pololu com docs 0J46 9 b Which is available in the Wixel SDK http github com pololu wixel sdk and included as part of the Wixel Development Bundle The Wixel User s Guide has more information on m
15. xtended 1x6 female headers for Arduino shields e one 1x12 female header http www pololu com catalog product 1030 Wixel socket header e one 1x11 female header http www pololu com catalog product 1021 Wixel socket header e one pushbutton http www pololu com catalog product 1400 Arduino reset button This provides everything you need to plug an assembled Wikxel http www pololu com catalog product 1336 into the shield and the shield into an Arduino Wixel shield for Arduino with included hardware The left picture below shows a fully assembled Wixel shield and the right picture below shows that assembled shield being used with a Wixel and an Arduino Uno Note that the header pins should be soldered into the outer rows of through holes as shown in the pictures below the inner rows provide additional access to the Arduino and Wixel pins 9 Note If the headers are not soldered in straight it might be difficult to plug the shield into the Arduino or the Wixel into the shield One technique for soldering headers on straight is to solder only a single header pin to the shield If the header is not straight you can melt the solder on this pin with your soldering iron and adjust the header with your free hand until it is You should only solder the rest of the header pins when you are sure the header is straight If none of your Wixels has header pins soldered in you will need to assemble at least one Wixel with
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