Arduino 雷达测距案例

1
// trigPin和echoPin是用于超声波传感器的引脚
2
const int trigPin = 9;
3
const int echoPin = 10;
4
// buzzerPin是蜂鸣器的引脚
5
const int buzzerPin = 11;
6
// redLedPin和greenLedPin是LED灯的引脚
7
const int redLedPin = 12;
8
const int greenLedPin = 13;
9

10
// 启动函数
11
void setup() {
12
  // 定义每个引脚的模式（是输入还是输出）
13
  pinMode(trigPin, OUTPUT);
14
  pinMode(echoPin, INPUT);
15
  pinMode(buzzerPin, OUTPUT);
38 collapsed lines
16
  pinMode(redLedPin, OUTPUT);
17
  pinMode(greenLedPin, OUTPUT);
18

19
  // 用于初始化串口通信，波特率为9600
20
  Serial.begin(9600);
21
}
22

23
// 主循环
24
void loop() {
25
  long duration, distance;
26
  // 触发超声波传感器发送一个信号
27
  digitalWrite(trigPin, LOW);
28
  delayMicroseconds(2); // 2微妙
29
  digitalWrite(trigPin, HIGH);
30
  delayMicroseconds(10); // 10微妙
31
  digitalWrite(trigPin, LOW);
32
  // 测量信号返回的时间
33
  duration = pulseIn(echoPin, HIGH);
34
  // 将时间转换为距离 29.1是将微秒转换为厘米的一个常数。
35
  distance = (duration / 2) / 29.1;
36

37
  // 距离小于10厘米，蜂鸣器和红色LED亮起，绿色LED熄灭；否则，蜂鸣器和红色LED熄灭，绿色LED亮起。
38
  if (distance < 10) {
39
    digitalWrite(buzzerPin, HIGH);
40
    digitalWrite(redLedPin, HIGH);
41
    digitalWrite(greenLedPin, LOW);
42
  } else {
43
    digitalWrite(buzzerPin, LOW);
44
    digitalWrite(redLedPin, LOW);
45
    digitalWrite(greenLedPin, HIGH);
46
  }
47

48
  // 将距离值输出到串口监视器
49
  Serial.println(distance);
50

51
  // 程序暂停100毫秒
52
  delay(100);
53
}

1
using System.IO.Ports;
2

3
namespace ArduinoExperiment
4
{
5
    public partial class FormMain : Form
6
    {
7
        SerialPort serialPort = new SerialPort("COM5", 9600);
8
        public FormMain()
9
        {
10
            InitializeComponent();
11
            serialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
12
        }
13

14

15
        private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
33 collapsed lines
16
        {
17
            string data = serialPort.ReadLine();
18
            Console.WriteLine(data);
19
            this.Invoke(new MethodInvoker(delegate
20
            {
21
                if (int.TryParse(data, out int distance))
22
                {
23
                    label2.Text = $@"当前距离:{data}";
24

25
                    if (distance < 10)
26
                    {
27
                        label1.Text = "距离过近!";
28
                        label1.BackColor = System.Drawing.Color.Red;
29
                    }
30
                    else
31
                    {
32
                        label1.Text = "安全距离!";
33
                        label1.BackColor = System.Drawing.Color.Green;
34
                    }
35
                }
36
            }));
37
        }
38

39
        private void startButton_Click(object sender, EventArgs e)
40
        {
41
            Console.WriteLine(1);
42
            if (!serialPort.IsOpen)
43
            {
44
                serialPort.Open();
45
            }
46
        }
47
    }
48
}