IoT Motion Sensor – NodeMCU ESP8266 + PIR

Previously we have done the same project using ESP8266 -01 and we received a lot of requests to do the same using NodeMCU ESP8266. So here it is ???? !!!.

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.

Hardware Required

Components	AliExpress	Amazon.com	Banggood
NodeMCU ESP8266
PIR Motion sensor

Working Theory

• We have connected the PIR motion sensor to one of the GPIO pins of the NodeMCU ESP 8266.
• Whenever the PIR detects motion then the output sates of the PIR sensor will change which will be detected by the controller.
• We have programmed the NodeMCU 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.

Circuit

• Connect GND of PIR sensor to the GND of NodeMCU.
• Connect the VCC of PIR sensor to the 3.3v of NodeMCU.
• Connect the OUT of PIR sensor to the digital pin D2 (GPIO 4) of NodeMCU.

Note: Some PIR sensors will work only from 5v above so if you are using such a PIR sensor then instead to connecting the VCC of PIR to 3.3v of NodeMCU connect it directly to separate 5v supply.

Click Here for PIR Sensor Pinout ^{THEPINOUT.TECH}

Click Here for NodeMCU Pinout ^{THEPINOUT.TECH}

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 NodeMCU.
• 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

#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 = 4; //PIR connected to GPIO 4, NodeMCU pin D2
 
void setup () {
 
  WiFi.begin(ssid, password);
  Serial.begin(9600);
 
  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
  {
    Serial.println("Motion Detected");
    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("Request link obtained from IFTTT");  //Specify request destination
      http.GET();   //Send the request
      http.end();   //Close connection
 
    }
    lastPIRstate = PIRstate;
  }
}