Published May 5, 2020

Smart Social Distancing Bot

Social distancing is one of the important things to observe in this pandemic. This device will help you maintain it smartly

IntermediateProtip4 hours477

Things used in this project

Hardware components

Ultrasonic Sensor - HC-SR04 (Generic)

Bolt IoT Bolt WiFi Module

Arduino UNO

Buzzer

LED (generic)

Breadboard (generic)

Jumper wires (generic)

Software apps and online services

Bolt IoT Bolt Cloud

Arduino IDE

Story

INTRODUCTION

We are all locked in our houses in this COVID-19 pandemic situation.When everything will fall into place then also we would all be scared with it.The precaution measures advised by the WHO are to maintain social distancing and to wash hands regularly.To maintain social distancing is a tough task. Hence we have designed a smart bot which will alert if anyone is at a distance less than 1m. Also it will send a message to the telegram bot to alert the person and also will make him aware by buzzing the buzzer and a red light will be on. The distance will also be displayed to create awareness.It will work as a two way device

1) Measure and alert about the distance

2) Check if the social distancing norm is broken and alerts he person smartly

HARDWARE SETUP

We have used Arduino Uno and interfaced it with HC-SR04 ultrasonic sensor. The data from the Arduino is transferred serially to the Bolt Wifi Module.

Further a Buzzer and a LED is connected to the GPIO pin of the IOT module such that it will become HIGH whenever the echo PULSE is High

This is just the circuit .We can modify it in the form of band or card according to our need

WORKING OF HC-SR04

HC-SR04 Ultrasonic (US) sensor is a 4 pin module, whose pin names are Vcc, Trigger, Echo and Ground respectively. This sensor is a very popular sensor used in many applications where measuring distance or sensing objects are required. The module has two eyes like projects in the front which forms the Ultrasonic transmitter and Receiver. The sensor works with the simple high school formula that

Distance = Speed × Time

The Ultrasonic transmitter transmits an ultrasonic wave, this wave travels in air and when it gets objected by any material it gets reflected back toward the sensor this reflected wave is observed by the Ultrasonic receiver module as shown in the picture below

Working of sensor

Connections:

Ultrasonic Pins:

Vcc = +5V pin of Arduino

GND : GND Pins of Arduino

Echo :Pin 13

Trig : Pin 12

BOLT IOT MODULE :

Pin 1 : Buzzer and LED

Rx - Tx

Tx-Rx (Both of Arduino)

GND = GND of Arduino

VCC = +5 V of Arduino

Working :

We have connected both the serial pins of IOT Module and Arduino with each other.Hence the data will be transferred via serial communication. The Ultrasonic Sensor is connected with the Arduino which will measure the distance and transfers it to the bolt Module.Then the code is designed with conditions which will check if the distance is less than 1 m and then will alert it through telegram bot

SOFTWARE SETUP

CONNECTING BOLT TO CLOUD

If you already have an account on the cloud.boltiot.com then skip this step.

To create your new account and link your Bolt device to cloud click here.

HOW TO SETUP TELEGRAM ACCOUNT

Content Credits for this topic -BOLT IOT

Steps to sign-up for/sign-in to Telegram

Go to the Playstore or App Store on your phone and search for Telegram.
Download and Install the latest version of Telegram app.
Signup for a new account or sign in to Telegram by providing your mobile number.
Telegram will call you OR send you a SMS to verify your mobile number.
Get your account verified and approve any permissions if required.
You will be logged in to Telegram and will be shown a screen similar to the one below. (It's okay if it differs from the screenshot below)

telegram account

Steps to create a channel

Go to the home screen of the Telegram app.
Swipe from the left side to reveal the menu.
Click on "New Channel".

It will ask you for a Name and Description for your channel. Give a suitable name and description. Adding photo is optional.
In the next screen set the channel as Public.
On the same screen, it will ask you to enter a permanent link for your channel. You can use lowercase letters and numbers 0-9 to create the channel link.
Please note that the channel link name is global and you will be able to create a channel link only if the link name is available. The channel link name is something similar to an email address, i.e. only one unique email ID can exist at one time.
You can keep the channel link name as temperature_alert_ followed by your email ID. Example, if my email ID is developer@boltiot.com, I can keep the channel link name as temperature_alert_developer_boltiot_com(I have removed the @ and. symbol since it was not allowed and replaced it with an underscore _). This is just a suggestion. You can keep the channel link name as you like as long as it is valid.
Keep a note of this Channel permanent link name. It will be required later on to send messages to this channel.
Congratulations! You have created a new channel. You can also view this channel from your app home screen.
You can click on the channel name at the top to view more details about it.
Next we will need to create and add a Bot to the channel so that it can post alerts for us in this channel.

Create a new Bot

Telegram allows us to create a new bot with the help of a bot called as "BotFather". It is a single bot to create and manage other bots.

On the Home screen of the app, click on the search icon on the top right and type in "botfather".

In the search results, click on the correct result for "BotFather" as shown below. The correct "BotFather" will have a blue tick mark next to its name. This will take you to a chat window with the "BotFather".

The chat will have a few items already and will display you a list of commands to get started.

Since we need to create a new Bot, go ahead and type in "/newbot" in the window.
It will ask you to type in few more details like Bot name and Bot username.
When your bot is created successfully, you will be shown a screen similar to the one below and will contain the Bot Token. This token is used to control your Bot as well as send messages on behalf of it. Please keep this token secure as it will allow anyone to access your Bot.

The telegram_bot_id will be used in the python code to send messages. The python code will be taught in the later lessons.
Also, please be careful when saving the Bot ID. You may get confused between 0 and O, I and 1 etc. as they are similar looking.
Congratulations, you have created a new Bot. Now, we will need to add it to the channel we have created previously so that we can send alerts.

Add the bot to channel

From the App home screen, open the channel we have created earlier.
In the screen, click on the channel name on the top to open the information for the Channel.
Click on the Administrators button so that we can add the newly created bot to the channel.
Search for the bot that we have created using the Bot's username. Once you have found the correct Bot click on it to add it to the channel. Please make sure you have clicked on the Administrators button in the previous step as this will allow our bot to post to the channel.
You will be asked to confirm the rights for the bot. Press on the tick mark on the top right to continue adding the bot to the channel. Make sure that the bot has the rights to "Post Messages".
You will now see the newly created Bot in the list of administrators for the channel.
Now we will code for sending messages to the channel via the Bot.

OUTPUT

Output for the telegram BOT

Output for the python terminal

Code

import requests                 # for making HTTP requests
import json                     # library for handling JSON data
import time                     # module for sleep operation

from boltiot import Bolt        # importing Bolt from boltiot module
api_key = "XXXX"               # This is your Bolt Cloud API Key
device_id = "XXXX"                  # This is the device ID and will be similar to BOLTXXXX where XXXX is some numbers
telegram_chat_id = "@XXXX"          # This is the channel ID of the created Telegram channel. Paste after @
telegram_bot_id = "botXXXX"         # This is the bot ID of the created Telegram Bot. Paste after bot
threshold = 100                   # Threshold beyond which the alert should be sent

mybolt = Bolt(api_key,device_id)
response=mybolt.serialRead('13')
print(response)


def get_sensor_value_from_pin(pin):
    """Returns the sensor value. Returns -999 if request fails"""
    try:
        response = mybolt.serialRead(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


def send_telegram_message(message):
    """Sends message via Telegram"""
    url = "https://api.telegram.org/" + telegram_bot_id + "/sendMessage"
    data = {
        "chat_id": telegram_chat_id,
        "text": message
    }
    try:
        response = requests.request(
            "POST",
            url,
            params=data
        )
        print("This is the Telegram URL")
        print(url)
        print("This is the Telegram response")
        print(response.text)
        telegram_data = json.loads(response.text)
        return telegram_data["ok"]
    except Exception as e:
        print("An error occurred in sending the alert message via Telegram")
        print(e)
        return False


while True:
  sensor_value = get_sensor_value_from_pin('13')
  print("The current sensor value is :", sensor_value)
  
  if sensor_value <= threshold:
    message=" Stay away .You are too close .Distance is " +str(sensor_value)
    telegram_status=send_telegram_message(message)
    mybolt.digitalWrite("1","HIGH")
    time.sleep(0.1)
    mybolt.digitalWrite("1","LOW")
  else:
    message = " You are safe .Distance is " str(sensor_value)
    telegram_status=send_telegram_message(message)
  time.sleep(5)

int trigPin=12;
int echoPin=13;
long duration,cm,inches;

void setup()
{ Serial.begin(9600);
pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
}

void loop()
{
  digitalWrite(trigPin,LOW);
  delayMicroseconds(5);
  digitalWrite(trigPin,HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,LOW);
 
/* Taking value of echoPin */
  pinMode(echoPin,INPUT);
  duration=pulseIn(echoPin,HIGH);
  /* TO display in cm */
  cm = (duration/2) /29.1;
  /* sending to the bolt iot module via serial communication*/
  Serial.println(cm);
  delay(250);
}

Smart Social Distancing Bot

Things used in this project

Hardware components

Software apps and online services

Story

INTRODUCTION

HARDWARE SETUP

WORKING OF HC-SR04

Working :

Steps to create a channel

Create a new Bot

Add the bot to channel

OUTPUT

Schematics

circuit diagram

circuit schematic

Code

social.py

ultrasonic sensor

Credits

Kashish Tilokani

Comments

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Smart Social Distancing Bot

Smart Social Distancing Bot

Things used in this project

Hardware components

Software apps and online services

Story

INTRODUCTION

HARDWARE SETUP

WORKING OF HC-SR04

Working :

Steps to create a channel

Create a new Bot

Add the bot to channel

OUTPUT

Schematics

circuit diagram

circuit schematic

Code

social.py

ultrasonic sensor

Credits

Kashish Tilokani

Comments

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