IbounceOn() applies the time filter only when the input changes from OFF to ON.

bool IbounceOn(uint8_t pin, uint32_t debounceTime)

void setup() {
  pinMode(0, INPUT);
}
 
void loop() {
  bool stableInput = Ibounce(0, 20);  // Applies a debounce time in both ON and OFF directions of the input.
  bool onDelayed = IbounceOn(1, 100);  // Apply the time filter only when the input changes from OFF to ON.
  bool offDelayed = IbounceOff(2, 100);  // Apply the time filter only when the input changes from ON to OFF.
}

The Ibounce functions retain state, so keep calling them in loop(). Specify the actual pin or logical channel for your product.

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