Is it possible to use XOD with the ATTINY85 ?
No in practice. XOD underlying type for a number is IEEE-754 float. AFAIK the compiler for ATtiny target lacks it. And there’s too few RAM on Tinies. So, I’d say the ATmega168 is a minimum requirement.
Thanks … I will have a look at the power requirement (and memory specs) for the ATmega168.