Published March 15, 2020 © CC BY

Covid-19 Coronavirus Doorbell

This Coronavirus Doorbell will detect people with high fever outside your home.

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Things used in this project

Hardware components

Arduino Nano R3

SparkFun MP3 Player Shield

Speaker: 3W, 4 ohms

IR temperature sensor MLX90614

SparkFun 7-Segment Serial Display - Red

Buzzer

DFRobot Gravity:Digital Push Button (Yellow)

Software apps and online services

Arduino IDE

Autodesk Fusion

Story

Coronavirus doorbell

It seems that writer Dean R. Koontz was right and Coronavirus pandemic is spreading at high speed.

Using airports method, scan your home visitors body temperature as soon as they ring the bell using IR remote temperature. If body temperature is normal ring the bell, otherwise an alarm will appear.

Connections

// IR Temp sensor SDA A4 SCL A5
// 7 Seg Display Clock D12 DIO D9
// Buzzer GND and D4
// Button GND and D3
// MP3 Player

Libraries required

#include <Wire.h>
#include <Adafruit_MLX90614.h>
#include <TM1637Display.h>
#include "SoftwareSerial.h"

Main loop code explained

  // read button
  buttonValue = digitalRead(buttonPin);  
               
  if (buttonValue == LOW) {
   // button has been pressed  
   
       beep(); // Play a beep
 
          
  // determines object temperature 
  bodyTemperature=mlx.readObjectTempC(); 

  // manual adjustment to temp reading
  bodyTemperature=bodyTemperature+adjustTemp;

  // send temperature to the 7 segment display
  display.showNumberDec(bodyTemperature, false,4);

  // Play mp3 doorbell sound
  execute_CMD(0x0F,0x01,0x01);
          
  // compare temperature with high fever in celsius
  if (bodyTemperature>38) {
      Serial.println("High fever");    
      // play mp3 alert sound 
      execute_CMD(0x0F,0x01,0x02);      
    }

  Serial.println();

  // delay until next push button reading
  delay(5000);
  
  } // button pressed

IR thermometer theory

Everything that has mass emits energy in the form of heat. Since there is heat being emitted by any object or person, an infrared thermometer can use the difference between the IR rays coming off of the person and the surrounding environment to determine temperature of the person itself.

The IR thermometer works by focusing light that is coming from the object in the form of IR rays and funneling that light into a thermopile. In the thermopile IR radiation is turned into heat, which is then turned to electricity, which is then measured.

Project details

The entire process starts with a doorbell button pressed. At that point, a hidden IR thermometer measures body temperature, the temperature is displayed in the 7 segment display screen and compared with standard fever temperatures. If visitor body has no temperature, the doorbell will ring, otherwise an alarm will alert you about a potentially infected visitor.

Coronavirus and fever

Coronavirus infected people have fever and fever can be easily measured but you have to consider that there are asymptomatic infected people and incubation periods.