/*
Simple Solenoid Timer - Mark Qvale
This will turn on an output (D13) for an adjustable amount of time (20ms to 600ms) with a 1 second fire delay to keep the activation a single event.
*/

// pin assignments
const int triggerPin = 2;    // the number of the trigger pin
const int firePin =  13;     // the number of the fire pin
int adjPin = A3;             // the analog adjustment pin

// variables
int buttonState = 0;         // variable for reading the triggerPin state
int interval;                // variable to set the firing time
unsigned long currentTime;   // variable to capture current time (ms)
int adj = 0;                 // variable to capture fire time adjustment

void setup() {
  pinMode(firePin, OUTPUT);      	 // initialize the fire pin as an output:
  pinMode(triggerPin, INPUT);        // initialize the trigger pin as an input:
}

void loop() {
  adj = analogRead(adjPin);					// sets adj to integer value
  interval = map(adj, 0, 1023, 20, 600);	// re-maps values to use in interval
  
  buttonState = digitalRead(triggerPin);
    if(buttonState == HIGH)
      {
      delay(1000);									// delay guarantees a single fire
      currentTime = millis();
      while(currentTime + interval >= millis()){	
      digitalWrite(firePin, HIGH);  				// fires solenoid for time = interval
      }
    }
  digitalWrite(firePin, LOW);						// resets firePin to off (0)
}