Touchless Door Opener

A simple circuit which allows you to open the door without touching it.

BeginnerFull instructions provided30 minutes1,512

Things used in this project

Hardware components

Arduino Nano R3

Ultrasonic Sensor - HC-SR04 (Generic)

SG90 Micro-servo motor

4xAA battery holder

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Hot glue gun (generic)

Story

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.

Step 1: Material Required

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

Step 2: Making the connections

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.

Step 3: Let's Code

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.

Code

Touchless door

#include <Servo.h>
Servo servo1;
int trigPin = 11;
int echoPin = 10;
long distance;
long duration;
 
void setup() 
{
servo1.attach(9); 
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);// put your setup code here, to run once:
}
 
void loop() {
  ultra();
  servo1.write(0);
  if(distance <= 10){
  servo1.write(90);
  }
}
 
void ultra(){
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration*0.034/2;
  }

Credits

Random Stuff We Make!

17 projects • 65 followers

We at RSWM! try to bring Fiction to Reality through projects which are Interactive, Creative & way too simpler in terms of making.

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Touchless Door Opener