I messed up when designing my PCB and just assumed that I could use software slave I2C with ATTiny84.
The reason I did so is - I needed to use all of the analog inputs.
The pins I have on my connector are:
PB0 (pin 2), PB1 (pin 3), PB2 (pin 5) and PA0 (pin 13)
Is there an alternative to I2C or a different communication protocol I could use to connect multiple of these slave boards to a master (ATMEGA328 etc.)?
Thanks a lot, I can provide any further information.