C#でIoTプログラミング on ESP32 #10 - SHT40

I2C接続のデジタル温湿度センサーのサンプルを紹介します。

ハードウェア

・Freenove ESP32-S3-WROOM Board or Espressif ESP32-S3-DevKitC
・Adafruit SHT40

配線

導入パッケージ

・nanoFramework.Hardware.Esp32
・nanoFramework.System.Device.I2c

プログラミング

Program.cs

using nanoFramework.Hardware.Esp32;
using System;
using System.Device.I2c;
using System.Threading;

namespace ESP32S3_SHT40
{
    public class Program
    {
        public static void Main()
        {
            Configuration.SetPinFunction(8, DeviceFunction.I2C1_DATA);
            Configuration.SetPinFunction(9, DeviceFunction.I2C1_CLOCK);

            var device = I2cDevice.Create(new I2cConnectionSettings(
                1,
                0x44,
                I2cBusSpeed.FastMode));

            while (true)
            {
                device.WriteByte(0xfd);
                Thread.Sleep(10);

                byte[] data = new byte[6];

                device.Read(data);

                ushort rawTemp = (ushort)(data[0] << 8 | data[1]);
                double temp = -45 + 175 * (rawTemp / 65535.0);

                ushort rawHum = (ushort)(data[3] << 8 | data[4]);
                double hum = -6 + 125 * (rawHum / 65535.0);

                Console.WriteLine($"Temp: {temp:F2}℃, Hum: {hum:F2}%");

                Thread.Sleep(1000);
            }
        }
    }
}