// This circuit switches an exhast fan (led) on for the time set by the three switches after 
// the button has been pressed. Typical delay of 5, 10, 20 minutes making max time of 35 minutes.
// Relay NC contact used because my relay is faulty and NO does not work!

// variables:
int switch0 = 0; //switch 0 connected to digital pin 0
int switch1 = 1; //switch 1 connected to digital pin 1
int switch2 = 2; //switch 2 connected to digital pin 2
int pbStart3 = 3; //start push button connected to digital pin 3
int relayPin = 4; //relay connected to digital pin 4
int rstButton = 5; // restart button

int lsw0 = 0; //set initial value of switch0
int msw1 = 0; //set initial value of switch1
int hsw2 = 0; //set initial value of switch2
// int pbStart3 = HIGH; //set initial value of pbStart button

int totalDelay = 0; //sum of switch values

int subroutine1();

void setup() {
  // put your setup code here, to run once:
  pinMode(switch0, INPUT_PULLUP);
  pinMode(switch1, INPUT_PULLUP);
  pinMode(switch2, INPUT_PULLUP);
  pinMode(pbStart3, INPUT_PULLUP);
  pinMode(relayPin, OUTPUT);
  pinMode(rstButton, INPUT_PULLUP);

  digitalWrite(relayPin, HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:

  int pbStart3Val = digitalRead(pbStart3);
  if (pbStart3Val == HIGH) {
    delay(150);
  } else {
    subroutine1();
  }
}

int subroutine1() {

int sw0Val = digitalRead(switch0);
//sw0Val = LOW;
  if (sw0Val == HIGH) {
    lsw0 = 1;
  } else {
    lsw0 = 0;
  }
 int sw1Val = digitalRead(switch1);
//sw1Val = LOW;
  if (sw1Val == HIGH) {
    msw1 = 2;
  } else {
    msw1 = 0;
  }
 int sw2Val = digitalRead(switch2);
//sw2Val = LOW;
  if (sw2Val == HIGH) {
    hsw2 = 4;
  } else {
    hsw2 = 0;
  }

totalDelay = (lsw0 + msw1 + hsw2) * 1000;

  digitalWrite(relayPin, LOW);
  delay(totalDelay);
  digitalWrite(relayPin, HIGH);
  delay(1000);  

}