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Step 2Programming the microcontroller
to program the microcontroller you will need the Atmel AVR ISP mkII programming kit (digikey part ATAVRISP2-ND). this connects between your USB port and the programming header on the circuit board. You will need the gnu AVR tool chain (http://sourceforge.net/projects/winavr/) to compile and download the code, or download with Atmel's free AVR Studio. the supplied code was written for the Imagecraft C compiler, but making it work with the gnu tool is simple.
The C code supplied does not include on/off button functionality, this should not be hard to add. you could also add a battery-voltage tester to sense when the battery is dead (this is important for lithium-ion, they are permanently damaged by discharging too much). to make a battery-voltage tester, you could (i think!) use a 3.0V zener diode and 220k resistor across the battery, and use the a-to-d converter on the mega8 to compare when the battery voltage falls below the zener reference voltage.
The C code supplied does not include on/off button functionality, this should not be hard to add. you could also add a battery-voltage tester to sense when the battery is dead (this is important for lithium-ion, they are permanently damaged by discharging too much). to make a battery-voltage tester, you could (i think!) use a 3.0V zener diode and 220k resistor across the battery, and use the a-to-d converter on the mega8 to compare when the battery voltage falls below the zener reference voltage.
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