/*
SN165 Phase 2 Two Switch input along blinking LEDs and Piezo sound generation with tone
Modified by Paul and David Bradt
Part of this code is based on this example code is in the public domain.
https://www.arduino.cc/en/Tutorial/BuiltInExamples/StateChangeDetection
*/
// this constant won’t change:
const int intTrack10 = 10; //IR Sensor 10
const int intTrack11 = 11; //IR sensor 11
int piezoPin = 8; //Setting up peizo transducer to make sound
// Variables will change:
int sensorVal_10 = 0; // counter for the number of button presses
int sensorVal_11 = 0; // current state of the button
void setup() {
//configure pin 0 and 1 as an input and enable the internal pull-up resistor
//configure the LED outputs
pinMode(intTrack10, INPUT_PULLUP); //IR sensor Track10
pinMode(intTrack11, INPUT_PULLUP); //IR sensor Track10
pinMode(2, OUTPUT);//Red LED2
pinMode(3, OUTPUT);//Red LED3
Serial.begin(9600);
}
void loop() {
digitalWrite(1, LOW); //Red2
digitalWrite(0, LOW); //Red3
sensorVal_10 = digitalRead(intTrack10);
sensorVal_11 = digitalRead(intTrack11);
//print out the value of the pushbutton
Serial.print("Track 10 value: ");
Serial.println(sensorVal_10);
delay(50);
Serial.print("Track 11 value: ");
Serial.println(sensorVal_11);
delay(50);
// Keep in mind the pull-up means the pushbutton’s logic is inverted. It goes
// HIGH when it’s open, and LOW when it’s pressed.
if (sensorVal_10 == LOW || sensorVal_11 == LOW){
digitalWrite(2, LOW); //Red2
digitalWrite(3, HIGH); //Red3
delay (200);
digitalWrite(2, HIGH); //Red2
digitalWrite(3, LOW); //Red3
// Section of code that simulates the crossing bell
tone(piezoPin, 1000, 100);
delay (200); //Pause then start again
} else{
digitalWrite(2, LOW); //Red2
digitalWrite(3, LOW); //Red3
}
}