ATmega32U4 USB Development Board, Arduino compatible

MT-DB-U4 Features

*   ATmega32U4 USB microcontroller
*   32KB FLASH, 2.5KB SRAM, 1KB EEPROM
*   12 10-bit ADC channels (1 used by LED)
*   Serial USART, SPI, and TWI (I2C) communications
*   4 timers with 14 PWM channels (up to 7 simultaneous)
*   Arduino compatible
*   CDC (Arduino/AVRDUDE) or DFU (FLIP) bootloader preinstalled
*   Bitlash preinstalled (Arduino command shell)
*   ISP header (program chip using external programmer)
*   16MHz crystal
*   Green Status LED
*   Reset button
*   Bootloader selection jumper
*   Mini USB connector
*   Powered by USB or external power supply
*   5V (USB) or 3V - 5.5V (external)
*   All pins routed to headers (including those used by on-board hardware)
*   Can be mounted on a breadboard
*   USB pins routed to header pins (for panel-mount USB connector)
*   Inductor on analog supply with separate ground pin
*   High-quality PCB with gold-plated finish
*   Measures approx. 2.1” x 0.9” (52mm x 23mm) and 0.062” (1.6mm) thick.
*   LUFA USB library compatible (http://www.fourwalledcubicle.com/)

Documentation

   User Guide

Arduino Support Features

* Arduino core and libraries ported to MattairTech USB boards
   26 digital, 11 analog, 7 PWM, 5 INT, 8 PCINT, TWI, SPI, USART1, 32KB FLASH, 2.5KB SRAM, 1KB EEPROM
* USB Serial interface replaces USART0
   Hardware maximum speed of 8Mbps
   Can use terminal emulator or serial monitor
   LED blinks when data is transferred (can be disabled)
   Uses the same methods as the original HardwareSerial.cpp (ie: Serial.println("Hello!"))
   Based on LUFA USB library by Dean Camera (www.fourwalledcubicle.com)
   USART1 also available; can be used at the same time
* Arduino/AVRDUDE compatible CDC bootloader preinstalled (optional)
* Bitlash Arduino command interpreter (bitlash.net) preinstalled
* All libraries included with Arduino download are now supported
* Bootloader automatically jumps to sketch after it is uploaded, reset button returns to bootloader


Arduino Pin Mapping




Bitlash / DAQ

Bitlash is an open source interpreted language shell and embedded programming environment. The preinstalled Bitlash firmware was compiled in the Arduino environment and supports Arduino functions (ie: dw() for digitalWrite()). A terminal emulator (ie: HyperTerm) or the Arduino serial monitor may be used.

* Up to 26 digital input/output (w/ optional pullups)
* Up to 11 10-bit analog inputs (0V-5V)
* Up to 7 8-bit PWM outputs (can be used for analog out)
* Up to 5 external pin interrupts
* Up to 2 simultaneous frequency outputs
* Pulse width measurement

The following example demonstrates data acquisition and control capabilities:

bitlash here! v2.0RC4 (c)2011 Bill Roy, bitlash.net -type HELP- 1706 bytes free
> pinmode(13,1)        // set pin 13 to be a digital output
> d13=1                // set pin 13 to high
> pinmode(12,0)        // set pin 12 to be a digital input
> d12=1                // enable internal pullup resistor for pin 12
> x=d12                // read pin 12 and store result in x
> print x              // display value of x
1
> print ar(0)          // read analog input 0, returns 0 - 1023 (0V - 5V), print result
784
> pinmode(1,1)         // set pin 1 to be a digital output
> a1=127               // set pin 1 to output a 50% duty cycle PWM (0 - 255)
> if (d12==0) {a1=(ar(0)/4);}    // set PWM output 1 to be proportional to analog input 0
>

The following example saves three functions to EEPROM. It is then run in the background, pulsing the LED using analog write (PWM). Note that this could also be setup to run automatically at boot, thus allowing for some autonomous operation:

bitlash here! v2.0RC4 (c)2011 Bill Roy, bitlash.net -type HELP- 1706 bytes free
> print free, " bytes free"
1702  bytes free
> pinmode(13,1)
> d13=1
> x=255;d=0;
> function brighter {if (x==255) {d=0;} else { a13=++x; snooze(2);}}
saved
> function dimmer {if (x==0) {d=1;} else {a13=--x; snooze(2);}}
saved
> function pulseLED {if (d==0) {dimmer();} else {brighter();}
saved
> ls
function brighter {if (x==255) {d=0;} else { a13=++x; snooze(2);}};
function dimmer {if (x==0) {d=1;} else {a13=--x; snooze(2);}};
function pulseled {if (d==0) {dimmer();} else {brighter();};
> run pulseled
> ps
0: pulseled
> stop 0
> 

Documentation for Bitlash is available at http://bitlash.net/wiki/docindex

Commands	arg else function help if ls peep print ps return rm run stop switch while
Functions	abs ar aw bc beep br bs bw constrain delay dr dw er ew free inb max millis min outb pinmode printf pulsein random shiftout sign snooze