Step 1 Wiring:

Published July 28, 2022 © GPL3+

Traffic Light LED

A simple 3 led traffic light system.

BeginnerFull instructions provided367

Things used in this project

Hardware components

5 mm LED: Red

5 mm LED: Yellow

5 mm LED: Green

Solderless Breadboard Half Size

Resistor 220 ohm

Jumper wires (generic)

Arduino UNO

USB-A to B Cable

Story

I think LEDs are VERY interesting. I wated to possibly add some LED traffic lights to my lego city, so I wanted to check out how I would make it; Im glad I did! I think that this system works amazingly! I am very happy with how it turned out. I didn't have my Arduino Uno on me, so I used the arduino HERO board from inventr.io. IT works the exact same.

A video showing my project! It cycles forever, until you tell it to stop. You can also plug in a 9V battery.

The code and wiring are provided below! These traffic lights can be used for anything too! I learned quite a few new things, and im sure beginners will too. Thanks for looking at my project!

Step 1 Wiring:

Wiring of the Traffic Lights

I used PowerPoint for the wiring. I don't have Fritzing

Make sure you use a 220 Ohm Resistor

Step 2 Coding:

So the next part is coding it! I'll explain the code, but it's very simple, which is why it's a beginner project!

So at the beginning of the code, we define every LED. Each LED is connected to a pin on our Arduino Uno. This lets the code know what each pin is, and its name.

So then we declare the LEDs as outputs.

Finally, this goes on forever.

So when we turn on our Arduino, it turns on the green LED, waits 10 seconds, turns it off, waits.2 seconds, turns on the yellow LED, waits 4 seconds, turns off the yellow LED, waits.2 seconds, turns on the red LED, waits 10 seconds, turns off the red LED and the whole process starts over.

Heres some part of the code

Code

Arduino Traffic Lights Code

//Coded BY: nolimitcircuit
//Last edited: 7/28/22...10:02 Am EST 


#define RLED 5 //Pin Red LED is connected to
#define YLED 6 //Pin Yellow LED is connected to
#define GLED 7 //Pin Green LED is connected to 

void setup() {
  // Declare the LEDs as an output
  pinMode(RLED, OUTPUT);
  pinMode(YLED, OUTPUT);
  pinMode(GLED, OUTPUT);
}

void loop() {
  
  digitalWrite(GLED, HIGH); // Turn the Green LED on
  delay(10000); // Wait for 10000 milliseconds (10 seconds)
  digitalWrite(GLED, LOW); // Turn the Green LED off
  delay(200); // Wait for 200 milliseconds (.2 seconds)
  digitalWrite(YLED, HIGH);// Turn the Yellow LED on
  delay(4000); //Wait 4000 milliseconds (4 seconds)
  digitalWrite(YLED, LOW); // Turn the Yellow LED off
  delay(200); //Wait for 200 milliseconds (.2 seconds) 
  digitalWrite(RLED, HIGH); //Turn the red LED on 
  delay(10000); //Wait 10000 milliseconds (10 seconds) 
  digitalWrite(RLED, LOW); //Turn Red LED off 
  
}

Credits

nolimitcircuit

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Traffic Light LED

Things used in this project

Hardware components

Story

Step 1 Wiring:

Schematics

Arduino Traffic Lights Schematics

Code

Arduino Traffic Lights Code

Credits

nolimitcircuit

Comments

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Traffic Light LED

Traffic Light LED

Things used in this project

Hardware components

Story

Step 1 Wiring:

Schematics

Arduino Traffic Lights Schematics

Code

Arduino Traffic Lights Code

Credits

nolimitcircuit

Comments

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