debounce problem

Using Arduino General Electronics
30

BenF:

tuxduino:
When the code enters an ISR interrupts are automatically disabled.
And automatically re-enabled when the ISR ends.
Also, how are you going to measure this bounce guard time, if interrupts are disabled hence millis() can't advance ?

The trick is to only disable the relevant interrupt vector (external interrupt or pin-change interrupt). Using external debounce-circuits with microcontrollers went out of fashion 20 years ago.- This thread can serve as good example why that is.

I thought about that. But then you'd have nested interrupts. Scary :stuck_out_tongue: Much better IMHO to have the ISR fire at regular intervals and debounce using volatile global variables, or by using static locals and using a volatile global to communicate with the main code.