Simulating a traffic light using LEDs and Arduino, I did the project with my 8-year-old son! He found it so cool.
COMPONENTS
- Arduino UNO
- Breadboard (Generic)
- Jumper Wires (Generic)
- LED (Red, Green, Yellow)
- Arduino USB 2.0 Data Cable
- Resistor 100 ohm
IDE used: Arduino IDE
This simple "for beginners " uses an Arduino and LEDs to simulate a traffic light.
Define variables, use lights by colour name:
// variables
int red = 10;
int yellow = 9;
int green = 8;
Create a function to configure the output colours of the LEDs (Red, Yellow, Green):
void setup(){
pinMode(red, OUTPUT);
pinMode(yellow, OUTPUT);
pinMode(green, OUTPUT);
}
This pinMODE function, configures the Arduino to use a defined pin as an output.
Write the code for the actual logic behind the traffic light simulation. The given values are in milliseconds
void loop(){
changeLights();
delay(15000);
}
void changeLights(){
// green off, yellow on for 3 seconds
digitalWrite(green, LOW);
digitalWrite(yellow, HIGH);
delay(3000);
// turn off yellow, then turn red on for 5 seconds
digitalWrite(yellow, LOW);
digitalWrite(red, HIGH);
delay(5000);
// red and yellow on for 2 seconds (red is already on though)
digitalWrite(yellow, HIGH);
delay(2000);
// turn off red and yellow, then turn on green
digitalWrite(yellow, LOW);
digitalWrite(red, LOW);
digitalWrite(green, HIGH);
delay(3000);
}
Upload the above code to your Arduino and run (make sure the right board and port are selected from Tools menu)
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