Controlling an LED using a Raspberry Pi and Node.js is super fun and easy with the onoff library, which gives you GPIO control right from JavaScript!

Here’s a full guide to blink an LED on a Raspberry Pi using Node.js 👇

✅ What You Need

• Raspberry Pi (any model with GPIO)

• LED

• 330Ω resistor

• Breadboard + jumper wires

🧰 Circuit Setup

1. Connect the LED:

   • Long leg (anode) → GPIO pin (e.g., GPIO17 → Pin 11 on Pi header)

   • Short leg (cathode) → Resistor → GND (e.g., Pin 6)

📦 Step 1: Install Node.js on Raspberry Pi

bash
sudo apt updatesudo apt install nodejs npm -y

Check version:

bash
node -vnpm -v

📦 Step 2: Create Project and Install onoff

bash
mkdir led-blinkcd led-blinknpm init -ynpm install onoff

💡 Step 3: Create blink.js

js
const Gpio = require('onoff').Gpio;// Use GPIO17 (pin 11)const led = new Gpio(17, 'out');let isOn = 0;// Blink every 500msconst interval = setInterval(() => {  isOn = isOn ^ 1; // toggle 0/1  led.writeSync(isOn);}, 500);// Cleanup on exitprocess.on('SIGINT', () => {  clearInterval(interval);  led.writeSync(0); // turn LED off  led.unexport();  console.log('\nLED Blinking stopped.');  process.exit();});

🚀 Step 4: Run the Code

bash
sudo node blink.js

Use sudo to access GPIO pins.

Your LED should now blink every 0.5 seconds! 🎉

🧠 Bonus: Control Multiple LEDs or Add a Button?

Want to:

• Blink multiple LEDs?

• Control via button or web UI?

• Build a REST API or dashboard for GPIO?