46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
// 定义引脚编号
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const int trigPin = 2; //D4
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const int echoPin = 4; //D2
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const int pinBuzzer = 5; //D1
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// 定义变量
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long duration;
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int distance;
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void setup() {
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pinMode(pinBuzzer, OUTPUT);
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digitalWrite(pinBuzzer, LOW);
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pinMode(trigPin, OUTPUT); // 将trigPin设置为输出
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pinMode(echoPin, INPUT); // 将echoPin设置为输入
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Serial.begin(9600); // 启动串行通信
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}
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void loop() {
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// Clears the trigPin
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digitalWrite(trigPin, LOW);
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delayMicroseconds(2);
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//将trigPin设置为HIGH状态10微秒
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digitalWrite(trigPin, HIGH);
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delayMicroseconds(10);
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digitalWrite(trigPin, LOW);
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// 读取echoPin，以微秒为单位返回声波传播时间
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duration = pulseIn(echoPin, HIGH);
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// 计算距离
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distance = duration * 0.034 / 2;
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// 打印距离在串行监视器
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Serial.print("Distance: ");
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Serial.println(distance);
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if (distance <= 20) { //如果距离小于10厘米小灯亮起
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digitalWrite(LED_BUILTIN, LOW);
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digitalWrite(pinBuzzer, HIGH);
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} else {
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digitalWrite(LED_BUILTIN, HIGH);
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digitalWrite(pinBuzzer, LOW);
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}
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delay(1000);
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}
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