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Corona Protected Automatic Doorbell


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A doorbell is an indicator/informative device typically placed near a door to a house/building entrance. When a guest/sightseer presses a button at the entrance gate, the doorbell rings inside the house/building, which alerts the owner/householder to the presence of the guest/sightseer. Continue touching the bell switch by different people is harmful as sars-cov-2 coronavirus communicates via touching anything that already comes in touch with the infected person. So protection from coronavirus at the entrance (doorbell switch) is necessary.

Hand-sanitization is one among all good precautions to prevent transmission of the novel coronavirus (sars-cov-2) in addition to social distancing.CDC (centers for disease control and prevention) recommends using hand sanitizer which at least contains 60 to 80% alcohol. The hand sanitizer which is available in markets contains ethanol with some other ingredients.

Here in our proposed project we design and implement an automatic doorbell with the help of interfacing of Arduino which rings automatically only when user/ guest/sightseer hands are sanitised by hand sanitizer. When someone wants to ring the bell he/she should show his/her hands just 3 to 5 cm. apart in front of the mq3 sensor (this sensor is the heart of our proposed project).

MQ3-SENSOR
MQ3-SENSOR

MQ3 Sensor

MQ3 sensor is a metal oxide semiconductor (mos) type of sensor also known as chemiresistors due to its sensing based on the change of the sensing material when exposed to sanitizer order (which contains ethanol).

MQ3 sensor consists a heating element that actually heats the conductive material layer whose resistance will be measured. The resistance changes when sanitiser smell comes into contact with mq3.

MQ3 sensor has both analog and digital output. Here we use the analog output from the mq3 sensor because a huge range of values from 0 to 1023 in signal (analog) is transmitted which corresponds to the intensity of alcohol in a sanitizer.

ULN-2003 (RELAY DRIVER IC)

ULN2003IC is a relay driver IC. we use this IC  when we require to drive high current loads by the use of digital logic circuits like an operational amplifier, 555 timers, logic gates, Arduino-Uno, microcontroller etc. ULN 2003 is basically used to drive a relay, dc motors, and stepper motors. This relay driver IC is used to drive 5-volt relay in the proposed work.

ULN-2003-(RELAY-DRIVERIC)
ULN-2003-(RELAY-DRIVERIC)

Working

When someone put his hands in front of (2 to 5 cm. distance) MQ3 after sanitise his/her hands from hand sanitizer then mq3 generates an analog output which will drive the interfaced Arduino-Uno to generate a signal at  pin-8 and pin- 9.  here led is connected at pin-8 which will glow when mq3 sense odor of sanitizer and pin 9 is connected to uln2003IC which actually drives relay at the same time and relay is connected to doorbell so it will ring.

If the user/ visitor does not sanitize his/her hands with hand- sanitiser then mq3 will not generate analog output so further Arduino-Uno and relay not drive so bell will not ring.

Advantage

  1. Automatic bell ring facility at entrance of Building.
  2. Mandatory use of hand- sanitizer so protection From corona.

Bill Of Material

LIST OF COMPONENTS
NAME QUANTITY APPROX. COST
ARDUINO-UNO 1 500/-
12v,2A adapter 1 230/-
MQ-3 ALCOHOL SENSOR 1 130/-
IC-ULN 2003 1 15/-
5V RELAY 1 20/-
ELECTRIC DOORBELL 1 150/-
LED 1 2/-
220OHM RESISTOR 1 1/-
Breadboard 1 75/-

Table 1:- List of components use in project (Bill of Material)

Circuit-diagram
Circuit-diagram

//rakesh Jain program
#define MQ3 A0
#define Thresold 420
int value;
void setup() {
pinMode(MQ3, INPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
Serial.begin(9600);
}
void loop () {
value = analogRead(MQ3);
Serial.println(value);
if ( value > Thresold )
{
digitalWrite ( 8 , HIGH );
digitalWrite ( 9 , HIGH );
}
else {
digitalWrite(8, LOW);
digitalWrite(9, LOW);
}
delay (500);
}

Circuit Prototype

(CIRCUIT PROTOTYPE WITH A MUSICAL ELECTRIC BELL)
(CIRCUIT PROTOTYPE WITH A MUSICAL ELECTRIC BELL)
(CIRCUIT-PROTOTYPE-WITH-A-SIMPLE-ELECTRIC-BELL)
(CIRCUIT-PROTOTYPE-WITH-A-SIMPLE-ELECTRIC-BELL)
(CIRCUIT-PROTOTYPE-DURING-TESTING)
(CIRCUIT-PROTOTYPE-DURING-TESTING)
(CLOSER-VIEW-OF-BREADBOARD)
(CLOSER-VIEW-OF-BREADBOARD)

RAKESH JAIN received Master degree in VLSI, B.E. in electronics and communication, DIPLOMA in electronics. He is currently working as an Assistant professor in ECE department in Geetanjali institute of technical studies, Udaipur. His research area is SENSOR and Microcontroller. He has 17 copyright and 3 Indian patents.

RAHUL MOUD received Master degree in VLSI, B.E. in electronics and communication. He is currently working as an Assistant professor in ECE department & Dean Student affair in Geetanjali institute of technical studies, Udaipur. His research area is Network theory and analysis.





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