/*
Traffic light with a pedestrian button
*/
// constants won't change. They're used here to
// set pin numbers:
// in Pin 12 we will connect the car red LED.
// Give it a name.
int carRed = 12;
// in Pin 11 we will connect the car yellow LED.
// Give it a name.
int carYellow = 11;
// in Pin 10 we will connect the car green LED.
// Give it a name.
int carGreen = 10;
// in Pin 9 we will connect the pedestrian red
// LED. Give it a name.
int pedRed = 9; //ped lights being assigned
// in Pin 8 we will connect the pedestrian green
// LED. Give it a name.
int pedGreen = 8;
// in Pin 12 we will connect the pedestrian
// button. Give it a name.
int button = 2;
//crossing time given to pedestrians
int crossTime = 5000;
// Variables
// collects the time since the button was last
// pressed
unsigned long changeTime;
// store pedestrian press button
int pedestrian;
// the setup routine runs once when you press
// reset:
void setup() {
// initialize the digital pin as an output.
pinMode(carRed, OUTPUT);
pinMode(carYellow, OUTPUT);
pinMode(carGreen, OUTPUT);
pinMode(pedRed, OUTPUT);
pinMode(pedGreen, OUTPUT);
// initialize the digital pin as an input
pinMode(button, INPUT);
// start with green car light on
digitalWrite(carGreen,HIGH);
// start with red ped light on
digitalWrite(pedRed, HIGH);
// initialize changeTime
changeTime = millis();
// initialize preState
pedestrian = LOW;
}
// the loop routine runs over and over again
// forever:
void loop() {
// check if button is pressed
// and it is over 5 sec since last button
// press
int state = digitalRead(button);
if (state == HIGH) {
pedestrian = HIGH;
}
if (pedestrian == HIGH &&
(millis() - changeTime) > 15000) {
//function to change lights
changeLights();
changeTime = millis();
pedestrian = LOW;
}
}
void changeLights() {
//green car light off
digitalWrite(carGreen,LOW);
// yellow car light on
digitalWrite(carYellow,HIGH);
//wait 2 seconds
delay(2000);
// yellow car light off
digitalWrite(carYellow,LOW);
//red car light on
digitalWrite(carRed,HIGH);
//wait 1 second to turn on ped light
delay(1000);
//red ped light off
digitalWrite(pedRed,LOW);
//green ped light on. allow crossing
digitalWrite(pedGreen,HIGH);
//delay preset time of 5 seconds
delay(crossTime);
//flashing of ped green light
for (int x=0; x<10; x++) {
digitalWrite(pedGreen,HIGH);
delay(250);
digitalWrite(pedGreen,LOW);
delay(250);
}
//turn red ped light on
digitalWrite(pedRed, HIGH);
delay(100);
//car green light on
digitalWrite(carGreen,HIGH);
//car red light off
digitalWrite(carRed,LOW);
}
