Automatic Hand Sanitizer Dispenser

• 30 cm timber (depends on the size of sanitizer or hand wash.)

• 19 cm by 16 cm plywood

• Ultrasonic sensor

• Servo motor

• Arduino Uno

Servo motor:

• Red wire to 5v

• Brown wire to ground

• Orange wire to digital pin 7

Ultrasonic sensor:

• vcc to 5v

• trig to digital pin 9

• echo to digital pin 8

• ground to ground

#include <Servo.h>

Servo servo1;

int trigPin = 9;

int echoPin = 8;

long distance;

long duration;

void setup()

{

servo1.attach(7);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

Serial.begin(9600);

}

void loop() {

delay(10);

ultra();

servo1.write(0);

if(distance <=5)

{

servo1.write(400);

delay(1000);

}

if(distance >=6)

{

servo1.write(0);

}

}

void ultra()

{

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = duration*0.034/2;

Serial.println(distance);

}