IoT Motion Sensor – ESP8266 01 + PIR

IoT Motion Sensor

In this project, we are going to learn how to make an Internet of things motion sensor which will give us alert on our phone when motion is detected at the place we installed the sensor. Everything works through the internet so there is no limitation of the distance between the sensor and the phone.

Video

Hardware Used

Components	AliExpress	Amazon.in	Amazon.com	Banggood	Utsource
ESP8266 01
PIR Motion sensor
ESP8266 serial adaptor

Working Theory

• We have connected the PIR motion sensor to one of the GPIO pins of the ESP 8266 – 01.
• Whenever the PIR detects motion then the output sates of the PIR sensor will change which will be detected by our ESP 8266 – 01 controller.
• We have programmed the ESP to make an HTTP GET request to our IFTTT webhooks applet.
• Whenever the HTTP GET request has been made then it will trigger a notification alert on our mobile phone.

Pin Out Diagrams

Circuit

• Connect the GND of ESP 01 and PIR sensor to the negative of the power supply
• Connect the 3.3v of the power supply to the VCC of both ESP 01 and PIR sensor
• If you are not using 3.3v supported PIR Sensor then follow this tutorial to use 3.3v in cheap PIR modules.
• Connect the OUT of PIR sensor to the GPIO 2 pin of ESP

IFTTT Applet Creation

• Before creating Applet in IFTTT you need to create an account in the IFTTT web site. www.ifttt.com
• Also, download the IFTTT app for your Android or iPhone.
• Download the Android app from here.
• Download the iPhone app from here.
• After downloading the app login with your user credentials.
• Also, allow all the permissions which ask for.

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Obtaining the HTTP GET request URL

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Uploading and testing

• Now upload the code to your ESP8266 – 01 using an FTDI or use an Arduino as a USB to TTL converter and upload the code.
• Then connect the circuit and power it on.
• Wait for 30 seconds to calibrate the PIR sensor, when calibration is done the onboard LED will turn OFF.
• Now whenever motion is detected the onboard LED will blink and
• A push notification will arrive on your phone saying “Motion Detected”.

Code

// IoT motion sensor by www.diyusthad.com
// www.youtube.com/c/diyusthad
// www.hackser.io/najad

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>

const char* ssid = "*****"; //Your WiFI ssid
const char* password = "*****"; //Your WiFi password
boolean PIRstate ; //variable to store PIR state
boolean lastPIRstate = HIGH;
int PIR = 0; //PIR connected to GPIO 0

WiFiClient wifiClient;

void setup () {

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED)
  {
    delay(1000);
  }

  pinMode(PIR, INPUT); //digitalWrite(PIR, LOW);

  pinMode(LED_BUILTIN, OUTPUT);

  delay(30000);

}

void loop()
{

  PIRstate = digitalRead(PIR);  //HIGH when motion detected, else LOW

  if (PIRstate != lastPIRstate)  //Checking if there is any motion
  {

    digitalWrite(LED_BUILTIN, LOW);
    delay(100);
    digitalWrite(LED_BUILTIN, HIGH);
    if (WiFi.status() == WL_CONNECTED)  //Check WiFi connection status
    {
      HTTPClient http;  //Declare an object of class HTTPClient

      http.begin(wifiClient,"paste the link from ifttt");  //Specify request destination
      http.GET();   //Send the request
      http.end();   //Close connection

    }
    lastPIRstate = PIRstate;
  }

}

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