I have a strange one that I hope someone can explain so I don’t go mad.
Iam using a pir sensor to wake an Arduino attached to interrupt 0 (nothing out of the ordinary)
However I am able to wake the Arduino even with there being no connection between the pir sense pin and the interrupt pin. I discovered this after I had accidentally pulled out the connecting wire and realised that mcu was waking from sleep still (full power down)
Any idea how this is still working? Is this witchcraft ?
Hardware is a Arduino mega core board using avr/sleep library.