Circuit Diagram Ultrasonic Distance Measurement

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Arduino Code

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 //define Pins #include <Servo.h> Servo servo; int trigPin = 11; int echoPin = 12; // defines variables long duration; int distance; void setup()  {   servo.attach(13);   servo.write(180);  delay(2000);    // Sets the trigPin as an Output pinMode(trigPin, OUTPUT); // Sets the echoPin as an Input  pinMode(echoPin, INPUT); } void loop()  { // Clears the trigPin digitalWrite(trigPin, LOW); delayMicroseconds(2); // Sets the trigPin on HIGH state for 10 micro seconds digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); // Reads the echoPin, returns the sound wave travel time in microseconds duration = pulseIn(echoPin, HIGH); // Calculating the distance distance= duration*0.034/2; // Prints the distance on the Serial Monitor Serial.print("Distance: "); Serial.println(distance); if ( distance <= 25   ) // Change Distance according to Ultrasonic Sensor Placement  { servo.write(180); delay(3000);  }  else  { servo.write(90);  } }
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