We have already discussed the IR sensor you can follow that tutorial as the PIR sensor has similar Arduino programming concepts, before going into depth about PIR sensor interfacing we should have a basic idea about the PIR sensor.

The full form of PIR is Passive Infrared Sensor. It detects the heat or energy of the environment. It also acts as a motion detection sensor. The internal structure of this sensor is based on a differential amplifier which detects the change of all external changes.

This PIR interfacing gives you a basic idea about how it can be controlled remotely using the Blynk mobile app, BlueTooth module.

Hardware Required:

01. Arduino UNO and Cell-Phone

02. OTG Cable

03. Arduino Cable

04. IR Sensor

05. Bluetooth HC-05 Module

06. Jumper Wires

Software Required:

01. Arduino-Droid App in Cell-Phone

02. Blynk App in Cell-Phone

Arduino and bluetooth module pin configuration will be like given table.

Arduino and PIR Sensor module pin configuration will be like given table.

01. Make the Circuit-Connections as shown above.

02. Open Arduino Droid App.

03. Paste the Code written in the Code-Section.

04. First Compile (try to remove comments if you get error) and then Upload the code to Arduino.

05. Now open Blynk App.

06. Open Widget Box in Blynk App by touching (+) icon in the Upper-Right Corner.

07. Now choose LED by clicking on it and set the Virtual Pin V1.

08. Now similarly choose Bluetooth Button.

09. The Blynk App Will Look like this.

10. Click Play Button and now you can read your PIR Sensor status in the Blynk App.

#define BLYNK_PRINT Serial
#include <SoftwareSerial.h>
SoftwareSerial SwSerial(10, 11); // RX, TX
#include <BlynkSimpleSerialBLE.h>
#include <SoftwareSerial.h>
int B;
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "b78eaead9f4246feb01a646e35286f40"; //(Your Auth. Code)
SoftwareSerial SerialBLE(10, 11); // RX, TX
BlynkTimer timer;
// This function sends Arduino's up time every second to Virtual Pin (5).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
WidgetLED led1(V1);
void myTimerEvent()
{
// You can send any value at any time.
// Please don't send more that 10 values per second.
Serial.print("Reading:");
if (B==HIGH) {
led1.on();
}
else
{
led1.off();}
}
void setup()
{
// Debug console
Serial.begin(9600);
pinMode(3,INPUT);
SerialBLE.begin(9600);
Blynk.begin(SerialBLE, auth);
Serial.println("Waiting for connections...");
// Setup a function to be called every second
timer.setInterval(100L, myTimerEvent);
}
void loop()
{
Blynk.run();
timer.run(); // Initiates BlynkTimer

1. Automatic Door Opening
2. Automatic Light Control
3. Motion Sensor Water-Gun