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How to use a Minimus board with Arduino
Installing Minimus board package
The minimus board support directory should be placed in the hardware subdirectory of you sketchbook directory. On a linux system you can do this with:
mkdir -p ~/sketchbook/hardware git clone git://github.com/pbrook/minimus-arduino.git ~/sketchbook/hardware/minimus
If using Windows I suggest creating the hardware directory inside your sketchbook directory, then extracting the github Download as zip archive there.
place the above
minimus directory into
avr-gcc used by the Arduino IDE is too old to support
atmega32u2, luckily there are nice people that maintain an AVR Crosspack for OSX here: http://www.obdev.at/products/crosspack
Download and install that
By default it install into
/usr/local/CrossPack-AVR while the Arduino IDE expects it to be in its app directory, so we do the 'ol switcharoo
cd /Applications/Arduino.app/Contents/Resources/Java/hardware/tools/ mv avr avr-original ln -s /usr/local/CrossPack-AVR /Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr
The 'minimus' directory needs to go into your 'My Documents\Arduino' folder.
The avr-gcc with the Arduino IDE for windows is out of date. You can either re-compile this yourself for windows, find someone who already has or you can download a full archive of the Arduino IDE and avr-gcc (combined with a snapshot of other minimus specific libraries).
Flashing the bootloader
The Minimus comes with a DFU bootloader installed. This is fine for "native" avr-c development, but does not play well with the Arduino IDE. To install the Arduino bootloader you will need an ISP programmer (e.g. and AVRISP mkII or Clone based on a Minimus or an Arduino running the ArduinoISP sketch). See below for the correct connections. Once connected fire up the Arduino IDE, ensure the correct board and programmer are selected, and click Tools/Burn Bootloader.
This only needs to be done once. The device should now appear as a serial port lite other Arduino boards. A glowing red LED indicates the bootloader is running. Windows users may need to install the Arduino Leonardo drivers.
I2C (aka TWI, i.e. the arduino "Wire" library) is not supported.
No analogue inputs. Analogue comparator support not implemented.
Servo library and tone function untested.
Pins are numbered 0-23 anticlockwise starting from the USB connector, as in the diagram below. Pins 11 (Ground), 20 (Reset) and 23 (Vcc) are not accessible from Arduino sketches. Pin 7 will be used to indicate USB activity if not otherwise used.