// https://www.programmingelectronics.com/make-one-button-functionality-two-arduino/
/////////Declare and Initialize Variables////////////////////////////

//We need to track how long the momentary pushbutton is held in order to execute different commands
//This value will be recorded in seconds
float pressLength_milliSeconds = 0;

// Define the *minimum* length of time, in milli-seconds, that the button must be pressed for a particular option to occur
int optionOne_milliSeconds = 100;
int optionTwo_milliSeconds = 500;  
int optionThree_milliSeconds = 2000;      

//The Pin your button is attached to
int buttonPin = 2;

//Pin your LEDs are attached to
int ledPin_Option_1 = 11;
int ledPin_Option_2 = 12;

void setup(){

  // Initialize the pushbutton pin as an input pullup
  // Keep in mind, when pin 2 has ground voltage applied, we know the button is being pressed
  pinMode(buttonPin, INPUT_PULLUP);     

  //set the LEDs pins as outputs
  pinMode(ledPin_Option_1, OUTPUT); 
  pinMode(ledPin_Option_2, OUTPUT); 

  //Start serial communication - for debugging purposes only
  Serial.begin(9600);                                     

} // close setup


void loop() {

  //Record *roughly* the tenths of seconds the button in being held down
  while (digitalRead(buttonPin) == LOW ){ 

    delay(100);  //if you want more resolution, lower this number 
    pressLength_milliSeconds = pressLength_milliSeconds + 100;   

    //display how long button is has been held
    Serial.print("ms = ");
    Serial.println(pressLength_milliSeconds);


  }//close while


  //Different if-else conditions are triggered based on the length of the button press
  //Start with the longest time option first

  if(pressLength_milliSeconds >= optionThree_milliSeconds){

    digitalWrite(ledPin_Option_1, HIGH);
    digitalWrite(ledPin_Option_2, HIGH);
  }

  //Option 2 - Execute the second option if the button is held for the correct amount of time
  else if (pressLength_milliSeconds >= optionTwo_milliSeconds){

    digitalWrite(ledPin_Option_2, HIGH); 
    digitalWrite(ledPin_Option_1, LOW);    

  } 

  //option 1 - Execute the first option if the button is held for the correct amount of time
  else if(pressLength_milliSeconds >= optionOne_milliSeconds){

    digitalWrite(ledPin_Option_1, HIGH);
    digitalWrite(ledPin_Option_2, LOW);  

  }//close if options

  //every time through the loop, we need to reset the pressLength_Seconds counter
  pressLength_milliSeconds = 0;

} // close void loop