Hot Wheels Finish Line

1//By Mike Freda - March 2020
2//Diecast electronic finish line
3//First  car to break IR beam is the lane winner
4//Uses Gikfun 5mm 940nm IR LED's emitters  and receivers: EK8443
5
6int analogOutPin1 = A1; // finish line beam lane 1
7int  analogOutPin2 = A2; // finish line beam lane 2
8
9const int ledPin1 = 11; //lane  1 winning LED
10const int ledPin2 = 12; //Lane 2 winning LED
11
12int sensorValueFinish1  = 0;
13int sensorValueFinish2 = 0;
14
15int sensorThresh = 500; //Sets the trigger  sensing threshold of the IR receivers. ~1000 = high
16
17void setup() 
18{
19  Serial.begin(9600);
20  pinMode(ledPin1, OUTPUT); //lane 1
21  pinMode(ledPin2,  OUTPUT); //lane 2
22  digitalWrite(ledPin1, HIGH); //Flashes Winner LED's
23  digitalWrite(ledPin2,  HIGH);
24  delay(2000);
25  digitalWrite(ledPin1, LOW);
26  digitalWrite(ledPin2,  LOW);
27}
28
29void loop() 
30{
31  //reads the analog in value:
32  sensorValueFinish1  = analogRead(analogOutPin1);
33  sensorValueFinish2 = analogRead(analogOutPin2);
34
35   // remove "//" from below for Debugging and checking actual sensor values.  
36   //             You may have to adjust sensorThresh value for better accuracy.
37   //             The sensors should read around 900-1000 then go "low" (less  than 400) when a car passes through the beam.
38    
39   // Serial.print("Sensor  Finish1 = " );
40   //Serial.println(sensorValueFinish1);
41   //Serial.print("Sensor  Finish2 = " );
42   //Serial.println(sensorValueFinish2);
43   //delay(50);
44
45//  wait/check for the finish sensors to be triggered
46  
47  if(sensorValueFinish1  < sensorThresh && digitalRead(ledPin2) == LOW) //Lane 1 is winner
48  {
49   digitalWrite(ledPin1,  HIGH); //turn on lane 1 winner LED
50   delay(5000);
51   digitalWrite(ledPin1,  LOW); //turn off lane 1 winner LED
52  }
53
54  if(sensorValueFinish2<sensorThresh  && digitalRead(ledPin1) == LOW) //Lane 2 is winner
55  {
56   digitalWrite(ledPin2,  HIGH); //turn on lane 2 winner LED
57   delay(5000);
58   digitalWrite(ledPin2,  LOW); //turn off lane 2 winner LED
59  }
60}