//By Mike Freda - March 2020
//Diecast electronic finish line
//First car to break IR beam is the lane winner
//Uses Gikfun 5mm 940nm IR LED's emitters and receivers: EK8443

int analogOutPin1 = A1; // finish line beam lane 1
int analogOutPin2 = A2; // finish line beam lane 2

const int ledPin1 = 11; //lane 1 winning LED
const int ledPin2 = 12; //Lane 2 winning LED

int sensorValueFinish1 = 0;
int sensorValueFinish2 = 0;

int sensorThresh = 500; //Sets the trigger sensing threshold of the IR receivers. ~1000 = high
  // Set low on Simulator on each IR receiver. Set around 0.1 LUX then slide high for trigger. This is only for simulator.                

void setup() 
{
  Serial.begin(9600);
  pinMode(ledPin1, OUTPUT); //lane 1
  pinMode(ledPin2, OUTPUT); //lane 2
  digitalWrite(ledPin1, HIGH); //Flashes Winner LED's
  digitalWrite(ledPin2, HIGH);
  delay(2000);
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
}

void loop() 
{
  //reads the analog in value:
  sensorValueFinish1 = analogRead(analogOutPin1);
  sensorValueFinish2 = analogRead(analogOutPin2);

   // remove "//" from below for Debugging and checking actual sensor values. 
   //             You may have to adjust sensorThresh value for better accuracy.
   //             The sensors should read around 900-1000 then go "low" (less than 400) when a car passes through the beam.
    
   Serial.print("Sensor Finish1 = " );
   Serial.println(sensorValueFinish1);
   Serial.print("Sensor Finish2 = " );
   Serial.println(sensorValueFinish2);
   delay(1000);

// wait/check for the finish sensors to be triggered
  
  if(sensorValueFinish1 < sensorThresh && digitalRead(ledPin2) == LOW) //Lane 1 is winner
  {
   digitalWrite(ledPin1, HIGH); //turn on lane 1 winner LED
   delay(15000);
   digitalWrite(ledPin1, LOW); //turn off lane 1 winner LED
  }

  if(sensorValueFinish2<sensorThresh && digitalRead(ledPin1) == LOW) //Lane 2 is winner
  {
   digitalWrite(ledPin2, HIGH); //turn on lane 2 winner LED
   delay(3000);
   digitalWrite(ledPin2, LOW); //turn off lane 2 winner LED
  }
}