Arduino Timer with Time Selector

timer.ino

// include url: http://www.forward.com.au/pfod/ArduinoProgramming/elapsedMillis.zip
#include <elapsedMillis.h>
// Init Hardware
int led[] = {8,9,10,11,12,13}; // Progress LEDs
int startBtn = 7; // Start btn
int resetBtn = 5; // Reset btn
int flip = 6; // Turn system off/on
int dial = 2; // Dial to set time

// Loop variables
int systemStatus = 0; // 0 = system is off, 1 = system is on
int runState = 0;
int resetState = 0;
int dialValue = 0;
int counterTime = 0; // Set up counter
int running = 0; // Is the timer running?

elapsedMillis timer0;
#define interval 60000

void setup() {
  pinMode(led[0], OUTPUT); // Define LED outputs
  pinMode(led[1], OUTPUT);
  pinMode(led[2], OUTPUT);
  pinMode(led[3], OUTPUT);
  pinMode(led[4], OUTPUT);
  pinMode(led[5], OUTPUT); // Status indicator light

  timer0 = 0; // clear the timer at the end of startup
  Serial.begin(9600);
}

void loop() {
  systemStatus = digitalRead(flip);

  if (systemStatus == HIGH) {
    // Start the system

    digitalWrite(led[5], HIGH); // Yellow system indicator LED

    if (running == 0) {
      // Only show dial's time estimate when timer isnt already running
      dialValue = analogRead(dial);
      counterTime = map(dialValue, 0, 1023, 0, 4);
    } else {
      // Timer 
      if (timer0 > interval) {
        timer0 -= interval;
        counterTime = counterTime - 1;
      }     
      // Make sure counter doesn't go below 0
      if (counterTime < 0) {
        counterTime = 0;
      }
    }

    // Light LEDs based on counterTime
    if (counterTime > 3) {
        digitalWrite(led[0], HIGH);
        digitalWrite(led[1], HIGH);
        digitalWrite(led[2], HIGH);
        digitalWrite(led[3], HIGH);
        digitalWrite(led[4], LOW);
      } else if (counterTime <= 3 && counterTime > 2) {
        digitalWrite(led[0], LOW);
        digitalWrite(led[1], HIGH);
        digitalWrite(led[2], HIGH);
        digitalWrite(led[3], HIGH);
        digitalWrite(led[4], LOW);
      } else if (counterTime <= 2 && counterTime > 1) {
        digitalWrite(led[0], LOW);
        digitalWrite(led[1], LOW);
        digitalWrite(led[2], HIGH);
        digitalWrite(led[3], HIGH);
        digitalWrite(led[4], LOW);
      } else if (counterTime <= 1 && counterTime > 0.1) {
        digitalWrite(led[0], LOW);
        digitalWrite(led[1], LOW);
        digitalWrite(led[2], LOW);
        digitalWrite(led[3], HIGH);
        digitalWrite(led[4], LOW);
      } else if (counterTime <= 0.1) {
        digitalWrite(led[0], LOW);
        digitalWrite(led[1], LOW);
        digitalWrite(led[2], LOW);
        digitalWrite(led[3], LOW);
        digitalWrite(led[4], HIGH);
      }

    // Start / Reset button
    runState = digitalRead(startBtn); // read the state of the pushbutton value:
    resetState = digitalRead(resetBtn); // read the state of the pushbutton value:

    if (resetState == HIGH) {
      running = 0;
      // turn LEDs on:
      digitalWrite(led[0], LOW);
      digitalWrite(led[1], LOW);
      digitalWrite(led[2], LOW);
      digitalWrite(led[3], LOW);
      digitalWrite(led[4], HIGH);
      delay(200);
      digitalWrite(led[0], LOW);
      digitalWrite(led[1], LOW);
      digitalWrite(led[2], LOW);
      digitalWrite(led[3], LOW);
      digitalWrite(led[4], LOW);
      delay(400);
    }

    if (runState == HIGH) {
      timer0 = 0; // clear the timer on button press
      running = 1;
      // turn LEDs on:
      digitalWrite(led[0], HIGH);
      digitalWrite(led[1], HIGH);
      digitalWrite(led[2], HIGH);
      digitalWrite(led[3], HIGH);
      digitalWrite(led[4], LOW);
      delay(200);
      digitalWrite(led[0], LOW);
      digitalWrite(led[1], LOW);
      digitalWrite(led[2], LOW);
      digitalWrite(led[3], LOW);
      digitalWrite(led[4], LOW);
      delay(400);
    } else {
      // turn LEDs off:
      digitalWrite(led[0], LOW);
      digitalWrite(led[1], LOW);
      digitalWrite(led[2], LOW);
      digitalWrite(led[3], LOW);
      digitalWrite(led[4], LOW);
    }
  } else {
    // System is off, reset variables and do nothing
    running = 0;
    digitalWrite(led[5], LOW); // Yellow system indicator LED
  }
}