Police light using arduino nano

In this tutorial, we are going to make a police light using Arduino nano. This project is based on the concept of led blinking. Police light is a good beginner project to understand how microcontrollers work with simple programs.

The components required to make this project are

1. Arduino nano / uno
2. 2 x blue led
3. 2 x red led
4. 220-ohm resistor
5. Breadboard
6. Jumper wires

As long as your desktop is connected to Arduino through cable. we don’t need any external power supply for Arduino.

Connection

Connect the pins of Arduino with the led as mentioned in the table below

Arduino pins	Led pins
D9	Blue led 1 +ve
D10	Blue led 2 +ve
D11	Red led 1 +ve
D12	Red led 2 +ve
Gnd	-ve of all led’s

Arduino code for police light using arduino nano

The code for police light using Arduino nano is given below with an explanation in the comments.

void setup()  // setup code

{

pinMode (9,OUTPUT);  // declaring pin D₉ for output mode

pinMode (10,OUTPUT); // declaring pin D₁₀ for output mode

pinMode (11,OUTPUT); // declaring pin D₁₁ for output mode

pinMode (12,OUTPUT); // declaring pin D₁₂ for output mode

}

 

void loop()  // to run code repeatedly

{

digitalWrite(9,HIGH);  // Putting pin D₉ high, led connected to D₉ will glow.

digitalWrite(10,HIGH); // Putting pin D₁₀ high, led connected to D₁₀ will glow.

 

delay(1000);  // delay code for 1 second

 

digitalWrite(9,LOW);   // Putting pin D₉ low, led connected to D₉ will off.

digitalWrite(10,LOW);  // Putting pin D₁₀ low, led connected to D₁₀ will off.

 

digitalWrite(11,HIGH); // Putting pin D₁₁ high, led connected to D₁₁ will glow.

digitalWrite(12,HIGH); // Putting pin D₉ high, led connected to D₁₂ will glow.

 

delay(1000);  // delay code for 1 second

 

digitalWrite(11,LOW);  // Putting pin D₁₁ low, led connected to D₉ will off.

digitalWrite(12,LOW);  // Putting pin D₁₂ low, led connected to D₉ will off.

}

More led can be put in parallel for a single pin of Arduino. Up to 3 led in parallel is good. A single command in a program can run multiple led in parallel.

https://www.youtube.com/watch?v=JKoMCeg6Qas

Author

Akash Sharma

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More projects on Arduino nano

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2. RADAR system using Arduino nano