Start by adding a new variable to the start of the program:
int button = 12; // switch is on pin 12
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
Now, in the setup function, add a new line to declare the switch as an input. I’ve also added a single line to start the traffic lights in the green stage. Without this initial setting, they would be turned off.
int button = 12; // switch is on pin 12
void setup() {
// put your setup code here, to run once:
pinMode(button, INPUT);
digitalWrite(green, HIGH);
}
void loop() {
// put your main code here, to run repeatedly:
}
In the loop function add the following:
int button = 12; // switch is on pin 12
void setup() {
// put your setup code here, to run once:
pinMode(button, INPUT);
digitalWrite(green, HIGH);
}
void loop() {
// put your main code here, to run repeatedly:
if (digitalRead(button) == HIGH){
delay(15); // software debounce
if (digitalRead(button) == HIGH) {
// if the switch is HIGH, ie. pushed down - change the lights!
changeLights();
delay(15000); // wait for 15 seconds
}
}
}
