How To Make Automatic Hand Sanitizer Dispenser Using Arduino – DIY

Arduino Code For Ultrasonic Sensor

    const int trigPin = 3;
    const int echoPin = 2;
    // defines pins
    long duration;
    int distance;
    void setup() {
    pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
    pinMode(echoPin, INPUT); // Sets the echoPin as an Input
    Serial.begin(9600); // For serial communication
    }
    void loop() {
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    //Distance calculation
    distance= duration*0.034/2;
    // Printinng the distance on the Serial Monitor
    Serial.print("Distance: ");
    Serial.println(distance);
    }

The above figure shows the connection diagram. In the above image, we have used IR sensors for object detection. If you don’t have an IR sensor then you can use the Ultrasonic sensor. In the above image, we have connected the IR sensor on pin number 2. 

Arduino Code For IR Sensor

#define IRsensor 2
void setup()
{
  pinMode(IRsensor, INPUT);
  Serial.begin(9600);
}
int readPin = 0;
void loop()
{
 readPin = digitalRead(IRsensor);
 Serial.print("IR Sernsor Output = ");
 Serial.println(readPin);
 delay(200);
}

In this, we have connected the relay module to the D7 pin of the Arduino board.

Arduino Code For Relay Module

#define DCwater_pump 8
void setup()
{
  pinMode(DCwater_pump, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
 digitalWrite(DCwater_pump,HIGH);
 Serial.println("DC Pump is ON Now!!");
 delay(500);
 digitalWrite(DCwater_pump,LOW);
 Serial.println("DC Pump is OFF Now!!");
 delay(500);
}

Code for Automatic Hand sanitizer (IR sensor) 

#define IRsensor 2
#define DCwater_pump 8
void setup()
{
  pinMode(IRsensor, INPUT);
  pinMode(DCwater_pump, OUTPUT);
  Serial.begin(9600);
}
int readPin = 0;
void loop()
{
 readPin = digitalRead(IRsensor);
 if (readPin == HIGH)
{
 digitalWrite(DCwater_pump,HIGH);
 Serial.println("DC Pump is ON Now!!");
 delay(500);
}
else
{
 digitalWrite(DCwater_pump,LOW);
 Serial.println("DC Pump is OFF Now!!");
 delay(500);

}
}

Code for Automatic Hand Sanitizer (Ultrasonic Sensor) 

    const int trigPin = 3;
    const int echoPin = 2;
    #define DCwater_pump 8
    // defines pins
    long duration;
    int distance;
    void setup() 
{
    pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
    pinMode(echoPin, INPUT); // Sets the echoPin as an Input
    pinMode(DCwater_pump, OUTPUT);
    Serial.begin(9600); // For serial communication
}
    void loop() 
{
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    //Distance calculation
    distance= duration*0.034/2;
    // Printinng the distance on the Serial Monitor
    Serial.print("Distance: ");
    Serial.println(distance);
    
 if (distance < 30)
{
 digitalWrite(DCwater_pump,HIGH);
 Serial.println("DC Pump is ON Now!!");
 delay(500);
}
else
{
 digitalWrite(DCwater_pump,LOW);
 Serial.println("DC Pump is OFF Now!!");
 delay(500);

}
}