// Solar-powered Light for a Bus Shelter with a motion sensor

//analog pins
int ldrPin = A0;

//digital pins
int ldrSignal = 4; //this pin is turn activates the latch whenever there is dark
int stopSignal = 6; //this pin acts as a stop signal for latch
int pirSensor = 3;

int dataVal = 5;

int output;

void setup()
{
  pinMode(ldrPin, INPUT);
  pinMode(ldrSignal, OUTPUT);
  pinMode(stopSignal, OUTPUT);
  pinMode(pirSensor, INPUT);
  Serial.begin(9600);
}

void loop()
{


 dataVal = analogRead(ldrPin);

 digitalRead(pirSensor);
 digitalWrite(stopSignal, LOW);
 digitalWrite(ldrSignal, LOW);
 
  //when it's dark enough, Arduino make ldrPin high, indicating that the button can be pushed.
  //Otherwise the button can be pressed during the day which does not make sence)
  if(dataVal <= 400) {
  	digitalWrite(ldrSignal, HIGH);
  }else {
  	digitalWrite(ldrSignal, LOW);
  }
  
  if(digitalRead(pirSensor) == HIGH) {
    
	digitalWrite(stopSignal, LOW);
    delay(15000); //the latch will continue for the next 15 seconds and then it will be unlatched
    digitalWrite(stopSignal, HIGH);
    
  }
  //This part isn't neccasary to have in the final version of code, but it is neccasary to have in order to check the values from a ldr 
 Serial.println(dataVal);
 delay(1000);
}