使用 C# 來操作 Arduino

C# 與 Arduino 相互溝通

整個概念就是依靠 Serial Port 來溝通，讓電腦端可以控制 Arduino 的 LED 燈

要讓 C# 可以控制 Serial Port，必須要引入 using System.IO.Ports 這個東西才行，安裝方式我是直接用 Nuget 去裝，不知為何我沒有內建這個東西。
相關介紹可以去看微軟的技術文件

C# 程式

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
namespace App1
{
    public partial class Form1 : Form
    {
        private SerialPort serialPort1 = new SerialPort();
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            serialPort1.BaudRate = 9600;
            serialPort1.Parity = Parity.None;
            serialPort1.DataBits = 8;
            serialPort1.StopBits = StopBits.One;
            btnDisconnect.Enabled = false;
            btnLedOpen.Enabled = false;
            btnLedClose.Enabled = false;
            cbPortNumber.Items.AddRange(SerialPort.GetPortNames());
            label1.Text = "PC狀態：尚未連線";
        }
        private void cbPortNumber_SelectedIndexChanged(object sender, EventArgs e)
        {
            serialPort1.PortName = cbPortNumber.Text;
        }
        private void btnConnect_Click(object sender, EventArgs e)
        {
            serialPort1.Open();
            btnConnect.Enabled = false;
            btnDisconnect.Enabled = true;
            btnLedOpen.Enabled = true;
            btnLedClose.Enabled = true;
            label1.Text = "PC狀態：連線中";
        }
        private void btnDisconnect_Click(object sender, EventArgs e)
        {
            serialPort1.Write("0");
            serialPort1.Close();
            btnConnect.Enabled = true;
            btnDisconnect.Enabled = false;
            btnLedOpen.Enabled = false;
            btnLedClose.Enabled = false;
            label1.Text = "PC狀態：斷線中";
            label2.Text = "Arduino回傳：";
        }
        private void btnLedOpen_Click(object sender, EventArgs e)
        {
            serialPort1.Write("1");
            btnLedClose.Enabled = true;
            btnLedOpen.Enabled = false;
            label1.Text = "送出指令：LED ON";
            label2.Text = "Arduino回傳：" + serialPort1.ReadLine();
        }
        private void btnLedClose_Click(object sender, EventArgs e)
        {
            serialPort1.Write("0");
            btnLedOpen.Enabled = true;
            btnLedClose.Enabled = false;
            label1.Text = "送出指令：LED OFF";
            label2.Text = "Arduino回傳：" + serialPort1.ReadLine();
        }
    }
}

Arduino 程式

void setup() {
   Serial.begin(9600);     // 開啟 Serial port, 通訊速率為 9600 bps
   // 初始化 LED 接腳
   pinMode(13, OUTPUT);
}
void loop() {
   // 檢查是否有資料可供讀取
   if (Serial.available() > 0) {
     // 讀取進來的 byte
     char inByte = Serial.read();
     // 根據收到的字元決定要打開或關掉 LED
     switch (inByte) {
     case '0':    
       digitalWrite(13, LOW);
       delay(1);
       Serial.println("LED OFF");
       break;
     case '1': 
       digitalWrite(13, HIGH);
       delay(1);
       Serial.println("LED ON");
       break;
     default:
       // 關掉所有的 LED
       digitalWrite(13, LOW);
     }
   } 
}