reuse a function that check if limit switch is activted

Projects Programming
3

You can't use the same function for both because a single function can only store one 'previous state'. You can use a single function if you pass both the pin number and a REFERENCE to the previous state.

boolean ButtonPressed(byte input_pin, boolean &lastState) {
  boolean buttonState = digitalRead(input_pin);
  boolean pressed = false;
  if (buttonState != lastState) {  // State has changed
    lastState = buttonState;  // Record the new state
    if (buttonState)
      pressed = true;
  }
  return pressed;
}

// Example calls:
const byte UP_STOP_SW = 0;
int buttonPushCounter_up = 0;   // counter for the number of button presses
boolean lastButtonState_up = 0;     // previous state of the button

const byte DW_STOP_SW = 29;
int buttonPushCounter_dw = 0;   // counter for the number of button presses
boolean lastButtonState_dw = 0;     // previous state of the button

if (ButtonPressed(UP_STOP_SW, lastButtonState_up))
  buttonPushCounter_up++;  // Count presses

if (ButtonPressed(DW_STOP_SW, lastButtonState_dw))
  buttonPushCounter_dw++;  // Count presses