/* sketch to turn on leds depending on pot setting
*/

byte led1Pin = 13;
byte led2Pin = 12;
byte led3Pin = 11;
byte potPin = A0;
int potVal;
const int thresh1 = 250;
const int thresh2 = 500;
const int thresh3 = 750;
int delayDT = 100;

void setup() {
  // put your setup code here, to run once:

  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(potVal, INPUT);

  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  potVal = analogRead(potPin);
  Serial.print("potVal = ");
  Serial.println(potVal);

   // default case, all leds low

  digitalWrite(led1Pin, LOW);
  digitalWrite(led2Pin, LOW);
  digitalWrite(led3Pin, LOW);
  
  if (potVal >= thresh1) {
    digitalWrite(led1Pin, HIGH);
    digitalWrite(led2Pin, LOW);
    digitalWrite(led3Pin, LOW);
  }
  if (( potVal >= thresh1) && (potVal >= thresh2)) {
    digitalWrite(led2Pin, HIGH);
    digitalWrite(led1Pin, LOW);
    digitalWrite(led3Pin, LOW);
  }
  if (( potVal >= thresh1) && (potVal >= thresh2) && (potVal >= thresh3) )  {
    digitalWrite(led3Pin, HIGH);
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
  }
 
  delay(delayDT);
}