Arduino Traffic Light

Let's start small. A basic, single traffic light is a good place to start.

Jun 1, 2021

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55700 views

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10 respects

Devices & Components

Arduino Uno Rev3

Male/Male Jumper Wires

5 mm LED: Red

Resistor 220 ohm

5 mm LED: Green

Breadboard (generic)

5 mm LED: Yellow

Project description

Code

Traffic Light Code

python

Arduino Traffic Light Project Code

1int red = 10;
2int yellow = 9;
3int green = 8;
4void setup(){
5     pinMode(red, OUTPUT);
6    pinMode(yellow, OUTPUT);
7    pinMode(green,   OUTPUT);
8}
9void loop(){
10    changeLights();
11    delay(15000);
12}
13void   changeLights(){
14    // green off, yellow on for 3 seconds
15    digitalWrite(green,   LOW);
16    digitalWrite(yellow, HIGH);
17    delay(3000);
18    // turn off   yellow, then turn red on for 5 seconds
19    digitalWrite(yellow, LOW);
20    digitalWrite(red,   HIGH);
21    delay(5000);
22    // red and yellow on for 2 seconds (red is already   on though)
23    digitalWrite(yellow, HIGH);
24    delay(2000);
25    // turn   off red and yellow, then turn on green
26    digitalWrite(yellow, LOW);
27    digitalWrite(red,   LOW);
28    digitalWrite(green, HIGH);
29    delay(3000);
30}

int red = 10;
int yellow = 9;
int green = 8;
void setup(){
     pinMode(red, OUTPUT);
    pinMode(yellow, OUTPUT);
    pinMode(green,   OUTPUT);
}
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);
}

Traffic Light Code

python

Arduino Traffic Light Project Code

1int red = 10;
2int yellow = 9;
3int green = 8;
4void setup(){
5    pinMode(red, OUTPUT);
6    pinMode(yellow, OUTPUT);
7    pinMode(green,  OUTPUT);
8}
9void loop(){
10    changeLights();
11    delay(15000);
12}
13void  changeLights(){
14    // green off, yellow on for 3 seconds
15    digitalWrite(green,  LOW);
16    digitalWrite(yellow, HIGH);
17    delay(3000);
18    // turn off  yellow, then turn red on for 5 seconds
19    digitalWrite(yellow, LOW);
20    digitalWrite(red,  HIGH);
21    delay(5000);
22    // red and yellow on for 2 seconds (red is already  on though)
23    digitalWrite(yellow, HIGH);
24    delay(2000);
25    // turn  off red and yellow, then turn on green
26    digitalWrite(yellow, LOW);
27    digitalWrite(red,  LOW);
28    digitalWrite(green, HIGH);
29    delay(3000);
30}

int red = 10;
int yellow = 9;
int green = 8;
void setup(){
    pinMode(red, OUTPUT);
    pinMode(yellow, OUTPUT);
    pinMode(green,  OUTPUT);
}
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);
}

Downloadable files

Circuit Diagram

Arduino Traffic Light Project Diagram

Circuit Diagram

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