Automatic Door Opening System – Assembly Video & Arduino Code

Code

// C++ Arduino Code (Copy Below)

#include <Servo.h>

Servo dustbinServo;

// Define pins
const int trigPin = 5;
const int echoPin = 6;
const int servoPin = 9;

// Variables
long duration;
int distance;

void setup() {

  dustbinServo.attach(servoPin);

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

  dustbinServo.write(0); // Lid closed

  Serial.begin(9600);

}

void loop() {

  // Send ultrasonic pulse
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read echo time
  duration = pulseIn(echoPin, HIGH);

  // Calculate distance (in cm)
  distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // If object is near (less than 15 cm)
  if (distance > 0 && distance < 15) {

    dustbinServo.write(90);  // Open lid

    delay(3000);             // Keep open for 3 seconds

    dustbinServo.write(0);   // Close lid
  }

  delay(300);
}

What You Need for This Project

To build this Automatic Goalkeeper, we used the following parts from the Plzpapa Basic Robotic Kit:

• Arduino Uno Board
• Servo Motor (SG90)
• Ultrasonic Sersor
• Wooden Goalkeeper Structure
• Jumper Wires
• (No soldering required!)