KISS indeed... huge fan of the concept here. Only when the simple stuff werks correctly, that I start adding candies
Correct. That would be the ATTINY85-20MURCT-ND in a QFN20 package. The smallest I've found (4x4x0.5), its minuscule. A dab of paste and it sits by itself (weightless).
https://www.digikey.com/product-deta...8aAoscEALw_wcB
Edit: just noticed the url ^ is wrong. Following one is correct:
https://www.digikey.com/product-deta...RCT-ND/2774367