Complete Guide to IoT Development with Raspberry Pi

Hardware Requirements

• Raspberry Pi 4 (4GB RAM)
• MicroSD card (32GB)
• DHT22 sensor
• Soil moisture sensor
• Relay module

Setup

sudo apt update
curl -fsSL https://deb.nodesource.com/setup_18.x | sudo -E bash -
sudo apt install -y nodejs

Building Smart Irrigation

const { Gpio } = require('onoff');

class SensorManager {
  constructor() {
    this.soilSensor = new Gpio(17, 'in');
    this.relay = new Gpio(27, 'out');
  }
  
  async readSoilMoisture() {
    const value = this.soilSensor.readSync();
    return (value / 1023) * 100;
  }
}

Cloud Integration

Connect to Parse Server for data storage and remote monitoring.

Conclusion

Raspberry Pi and Node.js provide a powerful platform for IoT solutions.