Team The Quadratic Equations:

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Published August 3, 2020 © GPL3+

Pango Band

This band helps in maintaining social distancing and also monitoring body temperature and alarm for sanitizing hands

IntermediateFull instructions provided387

Things used in this project

Hardware components

Espressif Wemos D1 Mini

Temperature Sensor

Buzzer, Piezo

LED (generic)

Resistor 1k ohm

Slide Switch

Rechargeable Battery, Lithium Ion

Software apps and online services

Arduino IDE

Story

Problem Statement:

These days we find people overthinking, thinking and neglecting one common thing, that is COVID-19. It does not have a particular treatment to cure so what one can do to not to be a target of this virus is taking preventive measures like

• Staying at home

• Maintaining distance from others

• Washing hands with alcohol-based soap or hand wash regularly

• Covering face with a mask or a cloth

We are frequently emphasised to keep a minimum distance of 1.5m between people and sanitise hands frequently and keep a regular check on our health conditions.

Social distancing matters a lot as lock down is ended. Normal working of society became necessary for economic growth. We have to stay apart to do our part but people are not following that and they tend to forget the actual situation we are in. Washing hands regularly or sanitizing hands for every 30 minutes is needed in this hard time. But we don't remember to do this in our daily schedules.

So, a device that always alerts you and keeps you in track of your health condition. This is very essential to tackle the present situation smartly.

Real time useof project:

This Pango band makes things simple for us by alerting us precisely. It reminds us to wash or sanitize our hands for every 30 mins through a buzzer. It alerts us to maintain distance from other person when we go close to the person by blinking red led.It notifies us about our body temperature if it is greater than normal body temperature (37.5℃ or 99.5℉) it enlightens a led so that we can take proper medication. It is simple and portable. It is easy to operate.

Circuit diagram:

Working:

Pango band is an ESP8266 based band which helps us to maintain social distance from others in our workplace or at any public places, to disinfect our hands time to time and to monitor our body temperature 24/7.

LM35 is a precision integrated circuit temperature sensor which monitors temperature based on ADC function. It has 3 pins: Vin for the supply (5V), Ground for ground(0V), Output for the output (Analog pin of microcontroller). If the body temperature is greater than normal human body temperature the led glows.

Piezo buzzer generates sound by inverse principal of piezo electricity. It has 2 pins in which one is attached to a PWM pin and the other is connected to the ground. It sounds for every 30 mins indicating us to clean our hands.

The band has aunique SSID and password same like a Wi-Fi router. The band is constantly present in access points (it acts as host for other band to connect) and station mode (it searches for other source to connect). Simply, a band which is acting like an access point is also searching for a Wi-Fi (another band). The band constantly checks for the presence of another band near to it. When it senses that there is a band near to it, it will find out the distance between 2 bands using RSSI. If the signal strength is greater than the threshold strength it blinks led as an indication to maintain distance and led goes off when the distance is maintained.

Note: The ESP doesn’t get confused between its own access point and others because the software of ESP enables it to ignore its own SSID even though it is searching for other access points of same name.

Code

Pango band code

#include <ESP8266WiFi.h> //includes wifi modules library
#include <Scheduler.h>
const char* APssid = "Pango band"; //the acess point credintails of the device
const char* APpassword = "life or death";
const int RSSI_MAX =-71;// maximum strength of signal in dBm
const int RSSI_MIN =-74;// minimum strength of signal in dBm
int LM35=A0;
#define LED1 D0
#define LED2 D1
#define buz D2
void setup()
{
pinMode(LED2,OUTPUT);
pinMode(LED1,OUTPUT);
pinMode(buz,OUTPUT);
WiFi.disconnect();
delay(100); //this part turns off the wifi and resets it if it was already on
Serial.begin(115200);
WiFi.mode(WIFI_OFF);
Serial.println();
WiFi.mode(WIFI_AP_STA); //configuring the board in hybrid mode
Serial.print("Configuring access point...");
WiFi.softAP(APssid, APpassword);
Serial.println(WiFi.softAPIP());
Scheduler.startLoop(loop2);
}
void loop()
{
Serial.println("Wifi scan started");
int n = WiFi.scanNetworks(); //assigns the scanned value to n 
Serial.println("Wifi scan ended");
if (n == 0)
{
Serial.println("no networks found");
}
else
{
Serial.print(n);
Serial.println(" networks found");
for (int i = 0; i < n; ++i) {
// Print SSID and RSSI for each network found
Serial.print(i + 1);
Serial.print(") ");
Serial.print(WiFi.SSID(i));// SSID
Serial.print(WiFi.RSSI(i));//Signal strength in dBm
Serial.print("dBm (");
if(WiFi.SSID(i) == "Pango band")
{
if(WiFi.RSSI(i) > -71 )//THIS -71 is the key this is the threshold value btw this value is set according to the distance of 1m
{
int i=1;
for(i=1;i<=10;i++)
{
digitalWrite(LED2,HIGH);
delay(1000);
digitalWrite(LED2,LOW);
delay(1000);
}
Serial.println("A BAND WAS FOUND")
break;
}
}
else
{
digitalWrite(LED2,LOW);
}
}
delay(100);
}
Serial.println("");
delay(100);
int analogValue = analogRead(LM35);
float millivolts = (analogValue/1024.0) * 3300; //3300 is the voltage provided by NodeMCU
float celsius = millivolts/10;
Serial.print("Temp in celsius= ");
Serial.println(celsius);
if(celsius>37)
{
digitalWrite(LED1,HIGH); 
Serial.println("led on");
delay(1000);
}
else
{
digitalWrite(LED1,LOW);
Serial.println("led off");
}
}
void loop2()
{
tone(buz,1000); //send 1khz sound signal
delay(3000);
noTone(buz); //no sound
delay(18000000);
}

Credits

Comments

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Pango Band

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Image

Code

Pango band code

Credits

Quadraticequation

Sneha Sneha

susmithapriya

Sabari Ganesh

Ravi teja Eegalapati

Comments

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Pango Band

Pango Band

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Image

Code

Pango band code

Credits

Quadraticequation

Sneha Sneha

susmithapriya

Sabari Ganesh

Ravi teja Eegalapati

Comments

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