//  Sketch: Arduino - push button switch - time pressed 001
//  Show the time a button switch has been pressed
//  www.martyncurrey.com
//  Pins
//  D12 to push button switch with 10K ohm pull down resistor

// tester le 8/11/24, source: https://www.martyncurrey.com/ardiuino-time-a-push-button-switch/
//FONCTIONNE: OUI

const int PIN_PUSH_BUTTON_SWITCH = 12;
   
// variables 

// switch status. Current and previous
boolean oldSwitchState = LOW;

// extra variables used for debounce
boolean newSwitchState1 = LOW;      
boolean newSwitchState2 = LOW;     
boolean newSwitchState3 = LOW; 

// timer to record how long the switch is closed
long timer_timeStart = 0;
long timer_timeStop  = 0;
  
void setup() 
{
    Serial.begin(9600);
    Serial.print("Sketch:   ");   Serial.println(__FILE__);
    Serial.print("Uploaded: ");   Serial.println(__DATE__);
    Serial.println(" ");

    pinMode(PIN_PUSH_BUTTON_SWITCH, INPUT); 
}
 
void loop()
{
    // simple debounce
    newSwitchState1 = digitalRead(PIN_PUSH_BUTTON_SWITCH);      delay(1);
    newSwitchState2 = digitalRead(PIN_PUSH_BUTTON_SWITCH);      delay(1);
    newSwitchState3 = digitalRead(PIN_PUSH_BUTTON_SWITCH);

    // if all are the same value then we have a reliable reading
   if (  (newSwitchState1==newSwitchState2) && (newSwitchState1==newSwitchState3) )
   {
        // check to see if the switch state has changed. 
        // This can be OPEN to CLOSED or CLOSED to OPEN.
        if (newSwitchState1 != oldSwitchState)
        {

            //  OPEN to CLOSED
            if ( oldSwitchState == LOW && newSwitchState1 == HIGH )
            {
                // the switch has just been closed / button has been pressed.
                // start the timer
                timer_timeStart = millis();
                Serial.print("Key pressed.  "); 
            }


            //  CLOSED toOPEN
            if ( oldSwitchState == HIGH && newSwitchState1== LOW )
            {
                // switch is OPEN and was CLOSED last time. 
                // stop timer and print the time the button was pressed
                timer_timeStop = millis();
                Serial.print("Key was pressed for ");   
                Serial.print(timer_timeStop - timer_timeStart ); 
                Serial.println(" ms"); 
            }

            oldSwitchState = newSwitchState1;
         
        } //  if (switchState != oldSwitchState)

  } // if (  (newSwitchState1==newSwitchState2) && (newSwitchState1==newSwitchState3) )
    
}  // loop