It's not a matter of turning on or off the relay itself. afaik all those relay boards have the embedded diode for this part of the problem.Grenello wrote: ↑Wed Oct 18, 2017 2:03 pmYes, you are quite right. After turning OFF the relay (GPIO from HIGH to LOW), I get massive feedback on a number of INPUT pins that are listening for momentary switches - its as if I have hit all 4 switches at once - all 4 interrupts get triggered as a result.
The real problem it turning on or off the load itself.
If you have feedback turning off the load, you need (NEED) to put a proper capacitor accross relay connectors (load side!)