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const int trigPin = 9; const int echoPin = 10; const int ledPin = 11; // Connect the LED to digital pin 11 long duration; int distance; void setup() { pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); pinMode(ledPin, OUTPUT); // Set LED pin as an output Serial.begin(9600); } void loop() { digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance = duration * 0.034 / 2; Serial.print("Distance: "); Serial.println(distance); if (distance < 10) { digitalWrite(ledPin, HIGH); // Turn on the LED } else { digitalWrite(ledPin, LOW); // Turn off the LED } }
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