Touchless Door Opener

This is a simple project to teach basic usage of Ultrasonic sensor with Servo motor to kids. The project is simple in terms of code, circuit & implementation.

• Arduino Nano/Uno/Mini
• SG-90 Servo motor
• HC-SR04 Ultrasonic sensor
• Jumper Cables

There are only a few connections to be made, follow the steps below:

• Attach the Arduino board to a breadboard.
• Connect 5v & GND to the side power rails of the breadboard.
• Connect the VCC & GND of Servo motor & Ultrasonic sensor to the power rails.
• Connect the Orange wire(Signal) of the Servo motor to pin 9 of Arduino.
• Connect the Trigger pin of the Ultrasonic sensor to pin 10 of Arduino.
• Connect the Echo pin of the Ultrasonic sensor to pin 11 of Arduino.

Explanation: This code uses the simple Servo library.

• Four variables were declared initially.
• In the setup part, the Servo pin is declared as 9. Trigger pin is declared as output & Echo pin is declared as input.
• In the Loop section, a function named Ultra was called & then the servo was made to rotate for 0 degrees.
• If Case checks the presence of the hand in front of ultrasonic sensor & hence rotate the servo to 90 degrees.