DUINOMITE USERS MANUAL
Contents
1. PIN 9 PIN 10 are marked with blue as they are multiplexed with SPI which is used for UEXT and SD card this means that if UEXT or SD card is accessed these lines will change their states Please do not use or use with care if you use also UEXT and SD card operations in your code PIN 19 PIN 20 are marked with blue as they are multiplexed with VGA VSYNC and VGA VIDEO DETECT Please do not use or use with care if you use also VGA monitor 3 8 PS 2 KEYBOARD PS2 keyboard CLOCK is connected to RD6 and DATA is connected to RD7 Note that the Keyboard requires 5V to work correctly so the keyboard will not work when the DuinoMite Mega is powered by 3 7V LiPo battery 3 9 VGA Video The VGA monitor is uses the PIC32 SPI to generate the video signal VGA HSYNC is generated by RD4 VGA VSYNC is generated by RB12 which is also connected to LED2 YELLOW and ARDUINO D9 VGA R G B signals are connected together via small SMD jumpers if you selectively cut them you can make your Video output RED GREEN BLUE AMBER or YELLOW in color PIC32 RG8 RG9 generates the Video signal Composite video signal is also generated if VGA monitor is not detected The composite video is output to the VIDEO RCA connector PAL SECAM NTSC modes are supported note that in Composite Video mode the screen resolution is lower than VGA mode 3 10 AUDIO The DuinoMite has two connectors an AUDIO RCA jack connector and a 3 5mm headphone connector MM2. if there is no power supply to any of the other sources DuinoMite Mega has a built in LiPo battery charger so once it senses power on POWER JACK USB or VIN it will charge the LiPo battery If present until the battery is charged to 100 The switching between the different power supplies is done automatically and glitch free with no need to change jumpers Board power is not lost during voltage source switching The LiPo battery with 3 7V 1400mA capacity and JST connector for DuinoMite Mega is available from Olimex At maximum frequency with a VGA monitor connected the consumption is 125mA which will allow the DuinoMite Mega to run about 10 hours on battery As the external power supply utilises a DC DC converter and not a linear voltage regulator the DuinoMite Mega power consumption when running at maximum frequency and with a VGA monitor and keyboard attached is 100mA when the input power supply is 12VDc at 30VDc the current will drop to 40mA and will rise to 130mA at 9VDC 3 1 2 DuinoMite Mini The DuinoMite Mini power supply is made with a linear voltage regulator to save cost an LM1117 is used The power source could be USB connector or POWER JACK The source is selected with a 3 way jumper The board has a protection ZENER diode 6 8V on the input to protect the board from over voltage spikes on the power supply Note The external power supply applied to the POWER JACK must be 5V REGULATED Note that applying non
3. load the code with a single mouse click 4 3 MM BASIC MM BASIC was developed by Geoff Graham you can see the original MaxiMite project at http www geoffg net What distinguishes the MM BASIC and the original MaxiMite design from all other development boards and tools is that it is a single chip complete computer solution with a PS2 keyboard and VGA monitor support so all you need for development is one small computer board which is build around the powerful PIC32MX795 microcontroller DuinoMite was started with the ambition to improve the current MaxiMite hardware by adding some hardware features that we felt were missing in the original design low power battery operation real UARTs CAN Arduino shield connector UEXT connector RTC support Ethernet etc 4 3 1 SOFTWARE INSTALLATION AND UPGRADE DuinoMite can reprogram itself with a new version of its firmware also known as firmware upgrading This is done with the help of small program called bootloader The same firmware is loaded on all DuinoMite boards there is no difference To start the bootloader software press and hold the BUT button then press and relese RESET button The green and yellow LEDs will start flashing 4 3 1 1 Bootloader exe For Windows The firmware upgrades can be downloaded from Olimex web site On your PC run the program called BootLoader exe and follow the instructions included in the upgrade package to re program the DuinoMite with th
4. with a USB connection thus there is no need to use a VGA monitor or PS2 Keyboard USB FAULT signal is low when there is no power supplied to either the USB or the POWER JACK It is connected to port RG7 and could be used to detect when you are powered only on battery 3 3 SD CARD A micro SD card connector is available on DuinoMite Mega DuinoMite Mini DuinoMite eMega and DuinoMite boards this connector is with push push action to insert and remove the card The uSD power supply is designed with ferrite bead filtering to minimise noise problems As DuinoMite and DuinoMite Mega are designed to be low power boards there is provision for the SD card power supply to be shut down this is done with FET2 connected to STB_E on RB13 port of PIC32 SD CARD presence is sensed by the SD_ CS connected to RD5 port there is low pull down made with 100K on this port so when there is no card inserted RDS is read as 0 when SD card is inserted it have 10K pullup inside which pull RDS high and it s read as 1 Note that the SPI used for the SD card is also wired to UEXT and ARDUINO connectors so programmer should take care of this when writing their code 3 4 UEXT The UEXT connector is a 10 pin connector which have the following signals 3 3V power supply GND Serial RX Serial TX SPI MOSI SPI MISO SPI CLK I2C CLK I2C DATA By having these signals available on a fixed interface allows us to develop different modules which can be used on any
5. AN will be implemented to be seen as a file the same as the COM ports so you will be able to do OPEN CAN AS 1 and use INPUT INPUTS and PRINT to send and receive CAN messages The CAN connector consists of these 3 signals CAN H CAN L these are the CAN physical layer twisted pair GND the shielding connection The CAN end node should have termination resistor and if CAN T is soldered shorted add such termination resistor to the CAN bus 3 7 GPIO The original MaxiMite introduced the 26 pin GPIO connector With the emergence of the DuinoMite and support for ARDUINO we expanded the GPIO layout as shown below ARefma ARef Gnd Gnd DI3 Pin 10 Reset Reset D2 Pin 9 Dil Pin 8 3 3 3v3 DIO Pin 7 o5 Gnd Gnd D9 Pin 20 Gnd Gnd D8 Pin 19 Vin Vin D7 Pin 18 D Pin 17 AO Pin 1 D5 Pin 16 Al Pin 2 D4 Pin 15 A2 Pin 3 D3 Pin 14 A3 Pin 4 D2 Pin 13 A4 Pin 5 D1 Pin 12 A5 Pin 6 DO Pin 11 26 Pin Arduino GPIO Header with Arduino standard names for reference RARARAR AAAS aANMTWMO OR ODS v e r gt fLfffLfffeecee OMmaacaaaaaadaaayd 3 0000000000000 2 oo0oo0oo0000000000 m PVOReRKSaT AVS e DOV See a L EELELLEELSE a aaacaaaaaaa 26 Pin Maximite Duinomite GPIO Header Looking inte rear of male header MM BASIC allows the GPIO ports to be accessed with the PIN command and function and different functions to be set w
6. BASIC can output to these connectors with the SOUND command with frequencies up to 1Mhz and by using the duty cycle parameter PWM will be available from these connectors 3 11 LEDS The DuinoMite has three LEDs RED power supply LED is ON when the board is powered by external power supply or USB and is OFF if the power supply is the LiPo battery YELLOW is the system RUN status if this LED is ON VGA video is generated correctly and the board is ready to work GREEN this is SD card activity LED and is ON when SD card is accessed PIN 0 will also drive this LED on and off 3 12 BUTTONS The DuinoMite has two buttons RESET and USER BUTTON RESET button does a hardware reset hot start and all code in memory is cleared and board initialized as if it was just powered up The Duinomite has a boot loader which allows the firmware to be upgraded without need of an external programmer To enter the boot loader the USER button should be pressed at power up or RESET To enter the boot loader press and hold USER button then press and release RESET button When you release the USER button the YELLOW and GREEN LEDs will blink alternately to show that the board is in boot loading mode To load the new firmware run the Bootloader exe and select the new HEX code The USER button status can also be read with the PIN 0 function 3 13 BATTERY The DuinoMite and DuinoMite Mega have a built in LiPo battery charger and the hardware is de
7. DuinoMite Mega software the Duinomite drivers for virutal com port console Unzipped it and store it in a folder that can be easily remembered Then under control panel system hardware device manager go to the named device Duinomite and update its driver to point to the files unzipped After the driver installation is complete the new port number will show up for the DuinoMite under Ports COM amp LPT Please take note of this port number Now you can use terminal program like Putty Terraterm MMIDE etc
8. DuinoMite User s Manual Revision 1 03 December 2011 Copyright 2011 Olimex Ltd Based on original Maximite by Geoff Graham www geoffg net Released under Creative Commons Attribution Share Alike 3 0 United States Licensee 1 INTRODUCTION DuinoMite is a series of compact development boards based on the PJC32 microcontroller from Microchip Technology Inc The DuinoMite is a complete computer running a BASIC interpreter called MM Basic originally written by Geoff Graham which when interfaced with a PS2 keyboard and VGA monitor is reminiscent of the old retro APPLE and TRS 80 personal computers No need for a PC no need for compilers IDEs programmers all you need to write embedded applications is DuinoMite DuinoMites have ARDUINO shield connectivity allowing ARDUINO shields to be directly interfaced making the DuinoMite the world s first stand alone ARDUINO Single Board Complete BASIC computer DuinoMite is a completely open source platform and the schematic and board files are available for download from the Olimex www olimex com web site and released under the Creative Commons Attribution Share Alike 3 0 United States License which generally means that you are free to use these files to create your own product providing you credit Olimex as the source and release your files with the same license as well The heart of DuinoMite is the PIC32MX795F512 which amongst others includes the following features On Chip 80Mhz cloc
9. SIC can access ARDUINIO SHIELDS with the PIN function These ports may be digital inputs digital outputs and analog inputs note max voltage to these ports should not exceed 3 3V as they may be damaged ARDUINO AO gt PIN 1 ARDUINO A1 gt PIN 2 ARDUINO A2 gt PIN 3 ARDUINO A3 gt PIN 4 ARDUINO A4 gt PIN 5 ARDUINO AS gt PIN 6 These ports may be digital inputs digital outputs they are SV tolerant so the maximum input voltage which you should apply to them should not exceed 5V ARDUINO DO gt PIN 11 COMI RX COM4 RX from RS232 connector ARDUINO D1 gt PIN 12 COMI TX COM4 TX from RS232 connector ARDUINO D2 gt PIN 13 COMI RTS ARDUINO D3 gt PIN 14 COMI CTS ARDUINO D4 gt PIN 15 COM2 RX ARDUINO DS5 gt PIN 16 COM2 TX ARDUINO D6 gt PIN 17 ARDUINO D7 gt PIN 18 NOTES DO amp D1 are wired via protection resistors to the RS232 connector COM4 on the DuinoMite Mega this means that if there are signals on the RS232 connector they will affect DO if D1 is initialized as INPUT this signal will merge with the signal on ARDUINO DO connector Also if D1 is initialized as output it will affect COM4 port transmission If you want to separate COM4 from DO and D1 you can do this by removing R2 and R3 As COMI TX RX are available on same DO D1 ports anyway R2 and R3 may be removed unless you need a fast UART there These ports share mor
10. ard socket two UEXT connectors one inside enclosure one outside CAN connector GPIO connector ARDUINO shield connector PS2 Keyboard connector RS232 connector VGA connector Audio RCA jack Composite Video RCA jack Headphones 3 5 mm jack RESET and USER buttons three status LEDs build in LiPo Lithium Polimer battery charger ultra low power design which allow down to 30uA current consumption Industrial temperature operation 40 85C Noise immunity ICSP programming connector for programming and debugging 32 768 KHz low frequency crystal allow implementation of RTC and low power modes 2 2 DuinoMite Mini This is the compact low cost entry level board with size of only 65 mm x 50 mm The schematic of the current revision of DuinoMite Mini is at http www olimex com dev in the DUINO section where you can also find the CAD schematic and board files Hardware features PIC32MX795F512H processor running at 80Mhz with 128KB RAM and 512kB Flash Linear power regulator require EXACTLY 5V to the DC POWER JACK USB Device DuinoMite Mini can take power from USB also there is 3 way jumper which selects which source is used the DC POWER JACK or the USB mini SD card socket UEXT connector GPIO connector PS2 Keyboard connector VGA connector RESET button USER buttons three status LEDs Commercial temperature operation 0 70C Noise immuni
11. board with a UEXT connector All DuinoMite boards have UEXT connectors and can interface Olimex s UEXT modules For more information on UEXT see _http www olimex com dev OTHER UEXT pdf Please look at the example section of this manual for sample MM BASIC code for various modules The DuinoMite Mega has two UEXT connectors one internal and one external 3 5 ARDUINO SHIELDS ARDUINO is popular platform for development by beginners and people with little knowledge in electronics This platform is gaining popularity and there are lot of projects using it Arduino allows various hardware modules to be stacked on top of each other They are called SHIELDS DuinoMite and DuinoMite Mega have this connector to allow ARDUINO SHIELDS to be connected This connector is also very useful for jumper wiring to an external breadboard The DuinoMite Mini has no ARDUINO shield connector on board but has the 26pin GPIO connector which can be connected to an external DuinoMite Shield board which adds the ARDUINO SHIELD connected via a 26 pin ribbon cable The ARDUINO SHIELD has these signals D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 AREF A0 A1 A2 A3 A4 A5 VIN GND 5V 3 3V RST CTS RTS DO D13 are digital I Os AO0 AS5 are analog I Os VIN input power which allows you to power DuinoMite or Mega by an external power supply RST reset CTS RTS handshake signals from the Mega s RS232 connector they are TTL levels MM BA
12. ce to DuinoMite 2MB on board Data Flash which could be used as disk for data and code storage PMP external connector with 80Mhz clock which could be used to interface to TFT displays fast ADCs allowing Duinomite to be used as Logic Analyzer Digital Storage oscilloscope capture for fast external signals 2 3 PIC32 1795 breadboarding PIC32MX795 This is a new breadboard based on Ken Segler s design It is T shaped and is intended to plug into a breadboard It incorporates a UEXT connector and USB with Device and Host OTG PIC32 T795 is the fastest way to make something with a breadboard and Jumper wires without the need to solder PIC32 T795 can be reused many times as no soldering is required 3 HARDWARE 3 1 POWER Supply 3 1 1 DuinoMite Mega DuinoMite Mega can be powered by four different sources POWER JACK with a 2 1 mm internal pin and 6 mm outer diameter the inner pin is positive the voltage that the DuinoMite Mega accepts on this connector is in range 9 30V DC note that there is a DC DC power supply implemented so the power consumption of this board is the same no matter what the input voltage is other similar boards we have seen use linear voltage regulators heat up when a higher voltage is applied and wastes energy There is a reverse voltage protection diode on this connector to protect against reverse polarity USB power supply when DuinoMite Mega is connected via a USB cable to a USB host it will take it
13. e new version 4 3 1 2 MPHIDFLASH For Linux Download mphidflash from http code google com p mphidflash Before you install it make sure you have installed libhid dev on your computer S sudo apt get install libhid dev then go to the directory where you downloaded and unpacked mphidflash and do make then sudo make install now the mphidflash is installed in usr local bin folder and you can access it from anywhere to load new firmware put DuinoMite in bootloader mode then type mphidflash w firmware hex v 15ba p 0032 r For MAC OS download the mphidflash binary and use like this mphidflash w firmware hex v 15ba p 0032 r 4 3 1 3 PIC32PROG For Linux Download PIC32PROG from http code google com p pic32prog you Can use svn svn checkout http pic32prog googlecode com svn trunk pic32prog 4 3 2 GETTING STARTED DuinoMite could work with PS2 keyboard and VGA monitor or with terminal via PC So to get started you will need either PS2 keyboard and VGA monitor either USB cable and PC STAND ALONE USE If you use PS2 Keyboard and VGA just plug them to the board and power it You will see on the VGA monitor this message MaxiMite BASIC Version x xx Copyright 2011 Geoff Graham Olimex Port By kenseglerdesigns com gt the gt prompt show that DuinoMite is ready to complete your commands BASIC is interpreter language which means that the instructions are decoded at executi
14. e than one function together and should be used with care ARDUINO D8 gt PIN 19 UEXT CS VIDEO SELECT ARDUINO D9 gt PIN 20 LED2 YELLOW VGA SYNC ARDUINO DIO gt PIN 7 UEXT SD CARD SS ARDUINO D11 gt PN 8 UEXT SD CARD MOSI ARDUINO DI2 PIN 9 UEXT SD CARD MISO ARDUINO D13 gt PIN 10 UEXT SD CARD CLK NOTES If you use UEXT SPI or SD CARD note that the SPI signals also go to ARDUINO D10 D13 ARDUINO D8 is shared with VIDEO SELECT and UEXT CS 3 6 CAN Controller Area Network CAN or CAN bus is a bus standard generally used in the automotive industry designed to allow micro controllers and devices to communicate with each other within a vehicle and without a host computer CAN is available only on the DuinoMite Mega CAN is a very useful interface it s the de facto standard for automotive bus applications so by having CAN it would be possible to connect to your car and read all of the data sensors for speed temperatures fuel consumption etc This video can give you rough idea what you can do with CAN and DuinoMite Mega http www youtube com watch v PbA_bOO2mMw Being a robust and noise immune protocol CAN is used not only in automotive but also in industrial robot applications For more information see the following links http en wikipedia org wiki DeviceNet http en wikipedia org wiki CANopen CAN is not supported currently in MM BASIC but in a future firmware C
15. ith SETPIN command SETPIN configurations 0 not defined 1 analog input AI 2 digital input DI 3 frequency input FI 4 period input PI 5 counter input CI 6 interrupt low to high IP 7 interrupt high to low IN 8 digital output DO 9 digital output open collector OC MMBasic Arduino 26pin header Allowable SETPIN Referrence Referrence Pin No Configurations PIN 1 gt ARDUINO AO 21 ALDI IPIN DO PIN 2 gt ARDUINO A1 19 AI DL IPIN DO PING gt ARDUINO A2 17 ALDI DO PIN 4 gt ARDUINO A3 15 ALDI DO PIN 5 gt ARDUINO A4 13 AI DI FI PI CI IP IN DO PIN 6 gt ARDUINO AS5 11 AI DI FI PI CI IP IN DO PIN 7 gt ARDUINO D10 9 Al DI FI PI CI IP IN DO gt DI gt 9 gt DO OC 7 PIN ARDUINO D12 5 Die s s DG 0C PIN 10 gt ARDUINO D13 3 DL DO OC PIN 11 ARDUINO DO 4 DI DO PIN 12 ARDUINO DI 6 DL DO PIN 13 ARDUINO D2 8 DL DO OC PIN 14 gt ARDUINO D3 10 DI DO OC PIN 15 ARDUINO D4 12 DL DO OC PIN 16 ARDUINO D5 14 DL DO OC PIN 7 gt ARDUINO D6 16 DL DO OC PIN 18 gt ARDUINO D7 18 DL DO O0C PIN 19 gt ARDUINO D8 20 ALDL DO PIN 20 ARDUINO D9 22 ALD gt 4 gt DO GND gt GND x3 1 2 25 26 5V gt 5v 1 23 3 3V gt 3 3v 1 24 NOTE The PIN 7 PIN 8
16. k operation 512KB Flash memory 128KB RAM memory USB with OTG functionality UARTs SPIs I2C ADC CAN PMP Three DuinoMite boards are in production DuinoMite Mega __http www olimex com dev DUINO duinomite mega hrml DuinoMite Mini http www olimex com dev DUINO duinomite mini hrml DuinoMite http www olimex com dev DUINO duinomite hrml and two more boards are in design phase at the current date DuinoMite eMega board with Ethernet Internal Flash and PMP with possibility for color VGA output PIC32 T795 which is a low cost general purpose development board for easy bread boarding using wire jumpers 2 BOARDS 2 1 DuinoMite Mega This is to date the most sophisticated board from DuinoMite range of boards BEPPPREER LEED h CIE 3393 pep CANT ie 2 A 449 a Glinex con dev dontronics com gt kenseglerdesigns com VRZI dus er gee Made in Bulgaria titt Rev C SPY PEE oh ery The schematic of the current revision of the DuinoMite Mega can be found online in the DUINO section at http www olimex com dev you will also find the CAD schematics and board files DuinoMite Mega is available for sale as either a pre assembled board only or alternatively in a laser cut custom made plastic enclosure Hardware features PIC32MX795F512H processor running at 80Mhz with 128KB RAM and 512kB Flash DC DC power supply 9 30V DC input USB Device USB Host OTG miniSD c
17. ogramming in C you will have access to all processor resources What you will need is Obtain MPLAB X and the C32 compiler from Microchip http www microchip com and download the latest DuinoMite firmware from Olimex http www olimex com we assume you already have a PIC32 programmer debugger if you do not have you may need to obtain the PIC KIT3 and PIC ICSP note that you will need the PIC ICSP even if you have the Microchip programmer as DuinoMite uses a small 0 05 ICSP connector instead of the more common 0 10 ICSP connector With this setup you have access to a complete development environment which works on Windows Linux MAC OS and you can use all of the hardware features of DuinoMite boards 4 2 PINGUINO IDE The Pinguino Project is a complete integrated IDE and C compiler It works with the boot loader so there is no need for programmers etc when you program using the Pinguino IDE The project page is at http www pinguino cc Pinguino implements the ARDUINO like language which is generally C libraries to allow easy programming of the hardware The DuinoMite boards are based on our PIC32 PINGUINO OTG project hardware and evolved from there so they can use the existing Pinguino programming environment the only difference is that a different boot loader should be programmed into the DuinoMite to support Pinguino IDE The Pinguino IDE allows you to program the DuinoMite in ARDUINO language or pure C C and
18. on time All Basic interpreters allow instructions to be executed at command prompt too First code on every language is to print HELLO WORLD this could be done in BASIC like this gt PRINT Hello world the result will be Hello world gt CONSOLE USE If you do not have PS2 keyboard and VGA monitor but have PC you still can develop with Duinomite by using it s virtual USB console To do this you need mini USB cable which you should plug to your PC and DuinoMite When you do this the red LED power will turn on along with the yellow LED which indicates the video sync and PIC32 CPU chip is good The green LED indicates SD card activity LINUX If you use Linux the DuinoMite drivers will be automatically recognized and installed Open console and install minicom terminal program S sudo apt get install minicom Then you should locate which virtual communication port is DuinoMite by running this command S dmesg grep tty You will see cdc_acm driver something like 1034731694556 cde acm S 171 0 TtyACMO USB ACM device Please remember tt yACMO as you have to setup minicom to use it minicom sS Setup the serial port to tt yACMO and you will see the greet message MaxiMite BASIC Version x xx Copyright 2011 Geoff Graham Olimex Port By kenseglerdesigns com gt WINDOWS If you use Windows it will try to search for drivers and will should fail so you have to download files from the Olimex website under
19. regulated or voltage above 5V could DESTROY the DuinoMite Mini Our recommendation is to use USB to power this board or the cheap under 2 power supply adapters for iPods iPads e readers etc which are with specification 5V 1A and are available on eBay 3 1 3 DuinoMite The DuinoMite has same sophisticated power supply like DuinoMite Mega and allows power supply 9 30VDC 3 2 USB The PIC32MX795 has a USB controller which can work in two modes USB device in this mode you can make USB HID devices or USB CDC devices and emulate such devices like Keyboard Mouse Serial port etc this mode is supported by all DuinoMite boards USB On The Go OTG host device mode in which the USB host PIC32 can interface USB mouse USB keyboard USB camera USB printers USB Bluetooth WiFi modules USB memory stick etc Of course all of these devices need proper drivers to be implemented This mode is not yet supported by DuinoMite Mini board Special care is taken in the DuinoMite design for USB noise immunity and protection when it works in host mode When working as USB host DuinoMite may provide up to 500mA to the USB devices attached so this should be taken into account when you size the power supply input voltage current MM BASIC uses USB as an HID device during boot loading when new firmware is updating then as a CDC serial port to establish a virtual console from which you can write your MM BASIC code via a terminal program
20. s 5V power supply from the USB host source to power the board note that depending on what frequency the DuinoMite Mega runs at it may consume up to 140mA so the USB port needs to be able to provide this current some USB ports are set to 100mA maximum current supply and may be not able to power the DuinoMite Mega Lithium Polimer battery DuinoMite Mega hardware is build to be very power efficient In Low Power mode DuinoMite Mega consumes only 30uA plus current draw from the I O pins while the RTC low frequency clock is running so this allows handheld and battery powered devices to be built with the DuinoMite VIN port on the Arduino platform Connector 1 Note that on this connector there is NO reverse protection diode so you should make sure 9 30V DC is applied to this port DuinoMite Mega could be powered by more than one power source at the same time for instance POWER JACK and USB at same time The different power sources have different priorities this means when two or more power sources are available at the same time only one of them is used The priority is the POWER JACK and VIN if the power supply is applied to any of these two connectors the power is sourced from them and not from the USB and or the battery second priority is USB if there is no power applied to POWER JACK or VIN and USB is active then the power will be taken from the USB The battery power supply is with lowest priority and board will take power from it only
21. signed to allow them to run in low power mode for battery operation USB FAULT is connected to RG7 to allow the firmware to be aware that it is running on battery instead of an external power supply If USB FAULT is read as 0 the board is powered by battery The battery charge state can be monitored by measuring the power supply on BAT port RB2 The Lithium Polimer battery is connected via the R31 R29 voltage divider 0 319727891 to RB2 port as RB2 can handle a maximum voltage of 3 3V but the battery voltage can go up to 4 2V when completely charged DM firmware adds PIN 21 analog input pin which could be used for Battery voltage monitoring Note that voltage is sensed through voltage vivider as PIC32 inputs can t measure more than 3 3V while Li Po battery voltage may go up to 4 2V when completely loaded This is why the measured values from PIN 21 should be multiplied by the magic number 3 13 to get the real battery voltage 3 14 HARDWARE SIGNATURE The DuinoMite hardware signature allows the firmware to be aware of which board it is running This is very useful for the boot loader to determine which firmware to download to it The signature is done by a voltage divider made from R40 R30 read on RB14 initialized as analog input For the current revision of the hardware the voltage divider is 1 10 so if 0 33V is read on this port your code runs on the DuinoMite hardware 4 SOFTWARE 4 1 DIRECT PROGRAMMING USING MPLAB C32 PIC KIT3 By pr
22. ty ICSP programming connector for programming and debugging 32 768 KHz low frequency crystal allow implementation of RTC and low power modes 2 3 DuinoMite DuinoMite IO DuinoMite Shield This is a compact low cost board in ARDUINO form factor ready to interface with ARDUINO shields The schematic of the current revision of DuinoMite DuinoMite IO DuinoMite Shield is at http www olimex com dev in DUINO section where you will also find the CAD schematics and board files Hardware features PIC32MX795F512H processor running at 80Mhz with 128KB RAM and 512kB Flash DC DC power supply 9 30V DC input USB Device USB Host OTG mini SD card socket UEXT connector EXT connector to connect DuinoMite IO with Keyboard Video Audio connectors GPIO connector ARDUINO shield connector DUINOMITE IO connector RESET and USER buttons three status LEDs build in LiPo Lithium Polimer battery charger ultra Low power design which allow down to 30uA current consumption Industrial temperature operation 40 85C Noise immunity ICSP programming connector for programming and debugging 32 768 KHz low frequency crystal allow implementation of RTC and low power modes 2 4 DuinoMite eMega This is a new Ethernet enabled board still in development The features will be similar to the DuinoMite Mega but with some additional features such as Ethernet connector and PHY controller which will add a 100Mbit Ethernet interfa
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