+---------------+          +---------------+          +-------------+
|  HC-SR04      |          |  Arduino      |          |  繼電器模塊  |
|               |          |               |          |             |
| VCC  → 5V     |          |               |          | IN  → D8    |
| Trig → D9     |          |               |          | VCC → 5V    |
| Echo → D10    |          |               |          | GND → GND   |
| GND  → GND    |          | A0 ← 電位器中點(diǎn)|          | COM → 負(fù)載+  |
+---------------+          +---------------+          +-------------+
       ▲                          ▲                          |
       |                          |                          |
       +--------------------------+--------------------------+
                                GND

const int trigPin = 9;
const int echoPin = 10;
const int relayPin = 8;
int thresholdDistance = 0;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(relayPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // 讀取電位器設(shè)定閾值（0-200cm）
  thresholdDistance = map(analogRead(A0), 0, 1023, 0, 200);

  // 觸發(fā)超聲波測距
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // 計算距離
  long duration = pulseIn(echoPin, HIGH);
  int distance = duration / 58;

  // 控制繼電器
  if (distance < thresholdDistance && distance > 0) {
    digitalWrite(relayPin, HIGH);  // 觸發(fā)開關(guān)
  } else {
    digitalWrite(relayPin, LOW);   // 關(guān)閉開關(guān)
  }

  delay(100);
}

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