I can not find what I thought would easy to find - what is the digital output for an attiny 25v or 45v.
As I understand it, an UNO will output 5v. But an attiny may operate on as low as 1.8v. is there a choice of digital output voltages ?
In a word, no.
Operating voltage is 1.8v to 5.5v per the datasheet. The digital output voltage is directly related to the voltage you provide. It is not exactly the voltage you provide, but very close and directly related.
TY_
thanks. that was helpful.