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PB1 is digital pin 1. PA5 is digital pin 5.
Agreed!
As I tried to state in my second post I now use PA7 on attiny (physical pin 6, digital pin 3) connected to arduino pin 7.
I see how this:
the rx from arduino to pin 7 and the tx on the tiny to PA7
can seem a bit confused.
What I meant was the tx on arduino is assigned pin 7 (in relaysoftserial.h) and the rx on attiny is assigned to PA7.
I will now test all pin positions on the attiny to rule out any assignment error...