Overview
Things
Story

How this Project works
Steps
Setting up Twillo for SMS Alerts
Testing
Conclusion

Published December 26, 2020

Hands-Free Doorbell with SMS Alert

Worried about sanitization of the Doorbell ? Why, Don't make it hands-free! Want to get notified through SMS alert. ? Lets Dive In!

IntermediateFull instructions provided1 hour585

Things used in this project

Hardware components

Bolt IoT Bolt WiFi Module

Digilent IR Proximity Sensor

Buzzer

Breadboard (generic)

LED (generic)

Male/Female Jumper Wires

Resistor 330 ohm

USB-A to Micro-USB Cable

Software apps and online services

Bolt IoT Bolt Cloud

Twilio SMS Messaging API

Story

Covid-19 can be best prevented by Social Distancing and regular Sanitization. To stop the spread, everything which comes in contact with others need to be sanitized. Doorbell is one such case which poses the risk of spread of Infection.

What if we make the doorbell handsfree, a person just need to raise his hand in front of the sensor and the buzzer will beep. LED will indicate that person that the buzzer is ON.

Owner will also have the advantage of getting notified through SMS whenever someone rings the doorbell.

How this Project works?

Initially when no-one is in-front of doorbell, the output of IR Sensor is 1 (digital) and buzzer and LED are in OFF State.

Whenever, someone puts the hand in front of the IR sensor, It is sensed by IR Sensor and send by bolt WiFi module to the BoltCloud.

On detecting the decrease in the sensor value (That is sensor value changed to 0), Buzzer and LED are turned ON. SMS alert is sent to the owner's phone with the help of Twillo.

When someone leaves, IR value again increases and LED and Buzzer are Turned off.

Steps

(Refer to circuit diagram for reference)

1. Connecting IR Sensor

VCC of IR to 3v3 volt pin of Bolt wifi module
GND of IR to GND of Bolt wifi Module
Output pin of IR to pin '0' of Bolt Wifi Module

2. Connecting Buzzer

VCC of Buzzer to Pin '1' of Bolt Wifi Module
GND of Buzzer to GND of Bolt Wifi Module

3. Connecting LED

VCC of LED to one end of resistor and other end of resistor to Pin '1' of Bolt Wifi Module
GND of LED to GND of Bolt Wifi Module

(LED and Buzzer are connected in parallel)

Setting up Twillo for SMS Alerts

Visit https://www.twilio.com/ .
Create account by clicking sign up, fill required details.
Confirm your email.
You will need to authenticate your phone number on which the sms alerts will be notified.
Enter the code sent to your phone
When prompted " Do you write code?" Click yes
Select python as your programming language
When prompted "What is your target today? "Choose" Twilio as a project.
When prompted "What do you want to do first? "Choose" Send or receive a message.
My First Twilio Project Dashboard page will open. Now you can Edit your Project as "My Project".
Get a trial number and save it somewhere and then choose to use this number.
You will see the ACCOUNT SID and AUTH TOKEN
We will need both of these so save them somewhere.

Testing

Connect bolt wifi module to the power supply using USB A to micro-USB cable.
connect the bolt wifi module with the hotspot
Run Handsfree_Buzzer.py file
put your hand in front of IR Sensor and see the results.

(As in code I have kept the delay of 4 seconds so output may need max 4 sec to show the output. You can also keep this delay to 1 sec.)

Conclusion

In this Project we were able to ring the doorbell without even touching it, which is beneficial for Covid-19 Safety.

Person ringing the doorbell is aware that the doorbell is ringing by the LED light.

Owner is notified on phone through the SMS Service that someone just ringed the doorbell.

This project may become more useful when used with the CCTV camera as:

When no one is at home and someone rings the doorbell then owner will be notified of it.
Owner will have the advantage of knowing who ringed the doorbell, at exact same moment and make take necessary steps and actions.
It will also act as a preventive measure against thief, as if and when someone passes in front of the doorbell it will ring and owner will also be notified of the same.
Now, you can rely on this whenever you are out, without any thought of security.

Schematics

Code

import conf, json, time
from boltiot import Sms, Bolt

#Extract required information from conf.py file
mybolt = Bolt(conf.API_KEY, conf.DEVICE_ID)
sms = Sms(conf.SSID, conf.AUTH_TOKEN, conf.TO_NUMBER, conf.FROM_NUMBER)

history_data=[]

while True:
    response = mybolt.digitalRead('0')
    data = json.loads(response)

    #If there was error in loading data
    if data['success'] != 1:
        print("There was an error while retriving the data.")
        
        #printing the error
        print("This is the error:"+data['value'])
        time.sleep(10)
        continue

    #If no error then print the value 
    print ("This is the value "+data['value'])
    sensor_value=0
    
    try:
        sensor_value = int(data['value'])
    except e:
        print("There was an error while parsing the response: ",e)
        continue

    


    try:
        #When no one is there set buzzer and led to OFF
        if(sensor_value==1):
            mybolt.digitalWrite('1','LOW')

        #when someone came and raised palm in front of doorbell set buzzer and led to ON
        else:
            mybolt.digitalWrite('1','HIGH')
            print ("Someone Ringed the DoorBell")

            #sending sms to phone number
            response = sms.send_sms("Someone Ringed the DoorBell")



       
    except Exception as e:
        print ("Error",e)
    time.sleep(4)

SSID = 'ACeexxxxxxxxxxxxxxxxxxxxxxxx98030'
 
#'You can find SSID in your Twilio Dashboard' 

AUTH_TOKEN = 'b6ec3xxxxxxxxxxxxxxxxxxxxae' 
#'You can find  on your Twilio Dashboard'

FROM_NUMBER = '+xxxxxxxx80'
#'This is the no. generated by Twilio. You can find this on your #Twilio Dashboard'

TO_NUMBER = '+91xxxxxxxxx2'
#'This is your number. Make sure you are adding +91 in beginning'

API_KEY = 'd7xxx838-xxxx-xxxx-xxxx-aaxxxxxxx0e'
#'This is your Bolt Cloud account API key'

DEVICE_ID = 'BOLTxxxxxxxxx'
#'This is the ID of your Bolt device'

Credits

Nikhil Likhar

1 project • 0 followers

Final year BE Computer Science Student at Shri Ramdeobaba College of Engineering and Management, Nagpur.

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Hands-Free Doorbell with SMS Alert