Introduction:
The working principle of the automatic sanitizer dispenser is to actuate the servo to press the sanitizer tap whenever the sensor observes a low distance reading due to an obstruction in its line-of-sight. When a person’s hand comes below the sanitizer and obstructs the sensor line-of-sight, the Arduino board receives a low distance reading and instructs the servo motor to actuate and dispense the sanitizer.
Component Required:
Arduino Uno
Uno cable
Ultrasonic sensor
Small breadboard
SG90 Micro-Servo motor
Jumper Wire
9V battery
Battery snapper connector
Circuit Diagram
Connections:
Connect sensor VCC pin to VCC
Connect sensor Trig pin to Arduino pin 3
Connect sensor Echo pin to Arduino pin 2
Connect sensor GND pin to GND
Connect motor VCC pin to VCC
Connect motor GND pin to GND
Connect motor Signal pin to Arduino pin 4
Code for Automatic hand sanitizer dispenser:
#include <Servo.h>
#define trigPin 3
#define echoPin 2
Servo servo;
int sound = 250;
void setup() {
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
servo.attach(4);
}
void loop() {
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if (distance < 5) {
Serial.println(“the distance is less than 5”);
servo.write(90);
}
else {
servo.write(0);
}
if (distance > 60 || distance <= 0){
Serial.println(“The distance is more than 60”);
}
else {
Serial.print(distance);
Serial.println(” cm”);
}
delay(500);
}
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Hope you understand the project well and if you are facing any errors do inform us in the comments section below.
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