Published May 9, 2020 © GPL3+

Fever Detection and Alert System

Afraid of Covid 19 crises?? Say no to people having FEVER in your House

BeginnerFull instructions provided2 hours1,036

Things used in this project

Hardware components

Bolt IoT Bolt WiFi Module

LM35 temperature sensor

LED (generic)

Buzzer

Breadboard (generic)

Jumper wires (generic)

Software apps and online services

Jupyter Notebook

Twilio SMS Messaging API

Bolt IoT Bolt Cloud

Bolt IoT Android App

Story

Introduction

No one is oblivious of Corona Pandemic rechristen as COVID 19 by WHO that has wreaked havoc all around the globe. We are going through a precarious phase of life and death. So it becomes paramount that we keep ourselves safe and maintain good health. One way of restricting the spread of coronavirus is to maintain social distancing. We must watch out for those who show symptoms of flu, cough etc and refrain us from getting in contact with them.

The idea of this project is inspired by the ongoing crises. It aims to detect whether the person standing at the door has fever or not and also notify the member of the house whether he should be allowed inside the house or not.

Setting up the project

Circuit Connection:- For making the hardware connection first collect all the parts shown in the below images:

1 / 6 • LM35 Temperature Sensor

Now to connect temperature sensor read from left to right (facing LM35 towards you) and do the connections as follows using male to female jumper wires:-

VCC pin of the LM35 connects to 5v of the Bolt Wifi module.
The output pin of the LM35 connects to A0 (Analog input pin) of the Bolt Wifi module.
GND pin of the LM35 connects to the GND.

Then connect the positive terminal of LED and Buzzer to the digital pin 1 and 2 respectively of the Bolt WiFi module and negative terminal to the GND.

At last, connect the Bolt Wifi module with Power Bank or Charger and connect it with WiFi using Bolt-Mobile App.

(Make sure to do the connection correctly as any wrong connection may damage the parts when you give supply to the module)

Circuit Connection

Account Set-up:- Make an account on Bolt Cloud and Twilio using the following link:-

Bolt Cloud:- https://cloud.boltiot.com/register/

Twilio SMS Service:- https://www.twilio.com/try-twilio

(Refer to the Bolt IoT course if you find any problem in making these accounts; you will have access to the course once you purchase the Bolt WiFi module)

Link:- https://trainings.boltiot.com/p/iotandml

After making both the accounts you will get your credentials as shown in the images below:-

1 / 3 • Copy the Device ID from here (crossed with blue)

Coding Environment:- Install Jupyter Notebook using the following link:- https://jupyter.org/

If you have "pip" already installed in your system then type the following command in Command Prompt terminal:-

pip install Jupyter

In the same terminal install bolt library by the following command (you won't be able to run the code of the project without this library):-

pip install boltiot

After installing open Jupyter Notebook and write down the project code using your following credentials:-

API_KEY = "xxxxxxxxxxxxxxxxxxxxx"   # Bolt API Key
DEVICE_ID = "xxxxxxxxxxxxxxxxxxxx" # Bolt Device ID
SID = 'xxxxxxxxxxxxxxxxxxxx' # Twilio Account SID
AUTH_TOKEN = 'xxxxxxxxxxxxxxxxxxxxxx' #Twilio Auth Token
FROM_NUMBER = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxx' # Twilio Trial Number
TO_NUMBER = 'xxxxxxxxxxxxxxxxxxxxxxxxx' #Your own mobile number

Demonstration

Now let us start with the working of the project

As the loop starts, both Buzzer and LED will blink for 0.5 seconds which will notify the user to put the temperature sensor between his arms to check for the fever. Then the reading time will start for 15 seconds. After 15 seconds the sensor value is compared with the threshold value i.e 380 (which is equal to 37 °C, The human body temperature is 37 °C)

(Formula to convert sensor value to °C = sensor_value*100/1024)

If the sensor value found to be less than 380 i.e. 37 °C, this means that the person is safe. He will get to know by the blinking of LED and the members of the house will get notified by the Twilio message as shown below:

Message from Twilio when person is safe

But if the sensor value turned out to be greater than 380 i.e. 37 °C, this means that the person has a fever. He might be affected by coronavirus as well. In that case, the buzzer will buzz and the members of the house will get notified by the Twilio message as shown below:

Message from Twilio when person is not safe

After the loop is over, the buzzer will buzz for 5 times which indicates that the person is tested. The next loop will start after 5 seconds to test the next person.

Working of the Project

Output

Messages from Twilio Trial Account

Output of Jupyter Notebook

Code

Code for the Project

                        #Project: Fever Detection and Alert System
#Import the Required Libraries

from boltiot import Sms,Bolt #Libraries required to connect with Bolt Wifi Module
import requests 
import json
import time

API_KEY = "xxxxxxxxxxxxxxxxxxxxx"   # Bolt API Key
DEVICE_ID = "xxxxxxxxxxxxxxxxxxxx" # Bolt Device ID
SID = 'xxxxxxxxxxxxxxxxxxxx' # Twilio Account SID
AUTH_TOKEN = 'xxxxxxxxxxxxxxxxxxxxxx' #Twilio Auth Token
FROM_NUMBER = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxx' # Twilio Trial Number
TO_NUMBER = 'xxxxxxxxxxxxxxxxxxxxxxxxx' #Your own mobile number
threshold = 380                    


mybolt = Bolt(API_KEY,DEVICE_ID)
sms = Sms(SID, AUTH_TOKEN, TO_NUMBER, FROM_NUMBER)

#Function for reading sensor value from Bolt Wifi Module
def get_sensor_value_from_pin(pin): 
    """Returns the sensor value. Returns -999 if request fails"""
    try:
        response = mybolt.analogRead(pin)
        data = json.loads(response)
        if data["success"] != 1:
            print("Request not successfull")
            print("This is the response->", data)
            return -999
        sensor_value = int(data["value"])
        return sensor_value
    except Exception as e:
        print("Something went wrong when returning the sensor value")
        print(e)
        return -999
    

while True:
    print("*******************************")
    print("Loop Starting")
    mybolt.digitalWrite("2","HIGH") # Both buzzer and led will be 'ON' which  
    mybolt.digitalWrite("1","HIGH") # indicate that the loop has started and you
    time.sleep(0.5)                 # need to place the temperature sensor 
    mybolt.digitalWrite("2","LOW")  # between your arms
    mybolt.digitalWrite("1","LOW")
    print("Reading time 15 secs") # Read the temperature of your body for 15 sec
    time.sleep(15)
    sensor_value = get_sensor_value_from_pin("A0")
    print(sensor_value)
    
    if(sensor_value > threshold): # true, means the Person has fever
        print("Making request to Twilio to send a SMS")
        response = sms.send_sms("Alert! The Person has fever. Body temperure is" + "{:.2f}".format(sensor_value*100/1024) + "°C. Don't let him enter the House")#sending message
        print("Response received from Twilio is: " + str(sensor_value))
        mybolt.digitalWrite("2","HIGH") 
        time.sleep(4)                    # Buzzer will be 'ON' for 4 seconds
        mybolt.digitalWrite("2","LOW")
        
    # true, means the person is safe
    else: 
        print("Making request to Twilio to send a SMS")
        response = sms.send_sms("Don't worry, the Person is Safe. Body temperature is "+ "{:.2f}".format(sensor_value*100/1024) + "°C. You may let him enter the House")#sending message
        print("Response received from Twilio is: " + str(sensor_value))
        mybolt.digitalWrite("1","HIGH")
        time.sleep(4)                   # LED will GLOW for 4 seconds
        mybolt.digitalWrite("1","LOW")
        
        for _ in range(5): #buzzer will 'ON' and 'OFF' 5 times which indicate 
            mybolt.digitalWrite("2","HIGH") #that the loop is over
            time.sleep(0.5)
            mybolt.digitalWrite("2","LOW")
    print("next cycle will start in 5 secs") # next cycle to test next person
    print("*******************************")
    time.sleep(5)

Credits

Pragati Gupta

1 project • 3 followers

Electronic and Communication Engineer student from University of Lucknow

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Fever Detection and Alert System

Fever Detection and Alert System

Things used in this project

Hardware components

Software apps and online services

Story

Introduction

Setting up the project

Demonstration

Output

Schematics

Circuit Connection

Code

Code for the Project

Credits

Pragati Gupta

Comments

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