read temperature

button1, button2, richtexbox1, serialport1,

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 serialCom
{
public partial class Form1 : Form
{
 
string datain;
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

}
private void button1_Click(object sender, EventArgs e)
{
serialPort1.PortName = "COM5"; //通信端口
serialPort1.BaudRate = 4800; //设置波特率
serialPort1.Open();//打开串口
}

private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
datain = serialPort1.ReadExisting();
this.Invoke(new EventHandler(DisplayText));
}

//定义返回数据函数
private void DisplayText(object sender, EventArgs e)
{
richTextBox1.Text = datain;

}

private void button2_Click(object sender, EventArgs e)
{
serialPort1.Close();
Close();
}

}
}

*************************************************************************

2.

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.Windows.Forms.DataVisualization.Charting;
using System.IO;

namespace sw
{
public partial class Form1 : Form
{
Queue<string> dataQueue = new Queue<string>(100);
int num =10;
string datain;

Boolean flag = true;

public Form1()
{
InitializeComponent();
serialInt();
InitChart();
}
private void button1_Click(object sender, EventArgs e)
{
serialSetInt();

this.timer1.Start();

}

private void button2_Click(object sender, EventArgs e)
{

if (flag == true)
{
this.timer1.Stop();
serialPort1.Close();
flag = false;
button2.Text = "继续测量";
}
else
{
this.timer1.Start();
serialPort1.Open();
flag = true;
button2.Text = "暂停测量";
}

}
private void button4_Click(object sender, EventArgs e)
{
this.timer1.Stop();
Close();
}

private void timer1_Tick(object sender, EventArgs e)
{

this.chart1.Series[0].Points.Clear();

updateQueue();
for (int i = 0; i < dataQueue.Count; i++)
{

this.chart1.Series[0].Points.AddXY(i, dataQueue.ElementAt(i));

}
}

private void updateQueue()
{

if (dataQueue.Count > 90)
{
//先出列
for (int i = 0; i < num; i++)
{
dataQueue.Dequeue();
}
}
for (int i = 0; i < num; i++)
{

dataQueue.Enqueue(datain);

}
this.chart1.ChartAreas[0].AxisY.Maximum = Convert.ToDouble(dataQueue.Max()) + 5;
//this.chart1.ChartAreas[0].AxisY.Minimum = Convert.ToDouble(dataQueue.Min()) +5;

}

private void serialSetInt()
{
serialPort1.PortName = comboBox1.Text;
serialPort1.Open();
serialPort1.BaudRate = int.Parse(comboBox2.Text);

}
private void serialInt()
{
string[] portList = System.IO.Ports.SerialPort.GetPortNames();
for (int i = 0; i < portList.Length; ++i)
{
string name = portList[i];
comboBox1.Items.Add(name);
}

string[] BaudRateList = { "1200","2400", "4800", "9600","19200","38400","57600","115200" };
for (int i = 0; i < BaudRateList.Length; i++)
{
comboBox2.Items.Add(BaudRateList[i]);
}

}

private void InitChart()
{
//定义图表区域
this.chart1.ChartAreas.Clear();
ChartArea chartArea1 = new ChartArea( );
this.chart1.ChartAreas.Add(chartArea1);
//定义存储和显示点的容器
this.chart1.Series.Clear();
Series series1 = new Series( );
this.chart1.Series.Add(series1);
//设置图表显示样式
this.chart1.ChartAreas[0].AxisY.Minimum = 260;
this.chart1.ChartAreas[0].AxisY.Maximum =360;
this.chart1.ChartAreas[0].AxisX.Interval = 5;
this.chart1.ChartAreas[0].AxisX.MajorGrid.LineColor = System.Drawing.Color.Silver;
this.chart1.ChartAreas[0].AxisY.MajorGrid.LineColor = System.Drawing.Color.Silver;
this.chart1.Series[0].Color = Color.Red;
this.chart1.Series[0].ChartType = SeriesChartType.Line;

}

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
datain= serialPort1.ReadExisting();
}

}
}

***********************************************************************

3.