Ideas for setting I2C device IDs I am using I2C to communicate between a collection of ATtiny85s that are acting as controllers for various parts of a system and the "Main Brain" -- a RaspberryPi. Most of the ATtiny85s only have a couple of free pins left (usually Pins 1 and 2 -- the reset and the pin that can't be used for PWM) so I can't use something like a DIP switch to directly set device IDs. I'd rather not hardcode the device IDs when I push code to the tinys but I can't think of a good, simple, and reliable way to do it otherwise. Anyone here have a suggestion?
Put the address in EEPROM. It's still "on the chip" but it can be programmed independent of the flash, and can be changed on the fly if deemed appropriate.