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  • Thank you for getting involved - it is much appreciated. I have tried to follow your suggestions and I have altered my code accordingly, however, I get an error message saying "debounced" not declared in this scope. I'm not sure if I am reading this correctly but I see that the if (debounced) statement comes before the Bool debounce statement - does this have an impact on the program? Commented Oct 4, 2024 at 12:50
  • My code now looks like this: void revmotor (){ if (debounced()) setdir = !setdir; } bool debounce() { static uint16_t state = 0; state = (state<<1) | digitalRead(reverseSwitch) | 0xfe00; return (state == 0xff00); } void setup() { pinMode (driverPUL, OUTPUT); pinMode (driverDIR, OUTPUT); attachInterrupt(digitalPinToInterrupt(reverseSwitch), revmotor, FALLING); } Commented Oct 4, 2024 at 12:53
  • OK - problem solved - tiny spelling error debounce / debounced. code is running now although the debounce action is still a little erratic. I'll keep experimenting. Thank you. Commented Oct 4, 2024 at 12:58
  • You could change the 0xfe00 to 0x8000 and 0xff00 to 0xc000 to have longer debouncing period. Commented Oct 5, 2024 at 4:26
  • Thank you again for your input. For me to understand what this change will do, could you explain what the changes mean please. Commented Oct 6, 2024 at 12:30