Overview

.NET implementations that help for better interaction with various IoT devices (LED, displays, keyboards, sensors, etc).

Keynotes

• Platform: netstandard2.0;
• Distributed via NuGet (check out Menaver.IoT.Devices)
• This repository leverages Github Actions (GHA);

Supported devices

• 💡 Light-emitting diode (LED)
• ⌨️ Matrix Keyboard M×N
• 📟 Liquid-crystal display (LCD): PCF8574, PCF8575, PCA8574, PCA8575
• 🌡️ Humidity & Temperature Sensor (DHT): DHT11, DHT12, DHT21, DHT22

Examples

More examples of using the IoT devices can be found in the test project Menaver.IoT.Devices.Tests.

Basic LED

Scheme

Code

List<Led> leds = new()
{
    new Led(4, Color.Red, false),
};

using var ledPanel = new LedPanel(leds);

ledPanel.SetAll(Color.Red);
await Task.Delay(300);

ledPanel.ResetAll();
await Task.Delay(300);

ledPanel.Toggle(4);

Obtaining Humidity & Temperature data from DHT sensor

Scheme

Code

using var dht = new Dht(dataPin: 4, DhtDevice.Dht22);

Console.WriteLine("Waiting for the sensor to response...");

while (true)
{
    var temperature = await dht.GetTemperatureAsync(TemperatureUnit.Celsius, CancellationToken.None);
    Console.WriteLine($"Temperature: {temperature:F1}\u00B0C");

    var humidity = await dht.GetHumidityAsync(CancellationToken.None);
    Console.WriteLine($"Humidity: {humidity:F1}%");

    await Task.Delay(1000);
}

Matrix Keyboard 4x4

Scheme

Code

    private static readonly int[] _inputs = { 18, 23, 24, 25 };
    private static readonly int[] _outputs = { 10, 22, 27, 17 };

    private static readonly char[,] _keyMap =
    {
        { '1', '2', '3', 'A' },
        { '4', '5', '6', 'B' },
        { '7', '8', '9', 'C' },
        { '*', '0', '#', 'D' }
    };

    public static async Task<int> RunAsync()
    {
        using var keypad4x4 = new MatrixKeyboard(_inputs, _outputs, _keyMap);

        while (true)
        {
            var key = await keypad4x4.ReadKeyAsync();

            Console.WriteLine($"Key pressed: {key}");
        }
    }