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I2C RGB LED driver in an ATTiny25 By Andrew Dodd atd7 at cornell dot edu Requires avr-gcc and avr-libc Control the LED's color by sending three bytes to the driver's I2C address, one each of Red, Green, Blue color. This code is currently configured to drive a common anode LED. It can be recompiled to support common cathode LEDs by changing a #define The I2C address defaults to 0x32 unless the first entry in the EEPROM is a valid I2C address, in which case that address is used for the EEPROM.