Automated Irrigation System Using Windows IoT

Hardware Overview

• Windows IoT Core on Raspberry Pi 4
• Soil‑moisture sensors (capacitive)
• 4‑channel relay module for pump control
• Azure IoT Hub for cloud‑to‑device messaging

Sample Code (C#)

// Program.cs
using System;
using Windows.Devices.Gpio;
using Microsoft.Azure.Devices.Client;
using Newtonsoft.Json;

class IrrigationController
{
    static GpioPin moisturePin, relayPin;
    static DeviceClient client;

    static async Task Main()
    {
        InitGpio();
        client = DeviceClient.CreateFromConnectionString(
            "HostName=your-iot-hub.azure-devices.net;DeviceId=raspi01;SharedAccessKey=...", TransportType.Mqtt);
        await client.SetMethodHandlerAsync("SetIrrigation", SetIrrigationAsync, null);
        Console.WriteLine("IoT Hub ready.");
        while (true)
        {
            var moisture = moisturePin.Read();
            await client.SendEventAsync(new Message(
                System.Text.Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new { moisture }))));
            await Task.Delay(30000);
        }
    }

    static void InitGpio()
    {
        var gpio = GpioController.GetDefault();
        moisturePin = gpio.OpenPin(5);
        relayPin = gpio.OpenPin(6);
        relayPin.SetDriveMode(GpioPinDriveMode.Output);
        relayPin.Write(GpioPinValue.Low);
    }

    static async Task SetIrrigationAsync(MethodRequest request, object userContext)
    {
        var payload = JsonConvert.DeserializeObject<dynamic>(request.DataAsString);
        bool on = payload?.on ?? false;
        relayPin.Write(on ? GpioPinValue.High : GpioPinValue.Low);
        return new MethodResponse(0);
    }
}

Deploying the Application

1. Flash the Windows IoT image to the SD card.
2. Enable Developer Mode on the device.
3. Install Visual Studio with the Windows IoT workload.
4. Deploy the project via Remote Machine debugging.
5. Configure the Azure IoT Hub connection string in appsettings.json.