Published April 19, 2019

MEGR 3171 Security Alarm

This project is a security system that will alert your cell phone when the PIR sensor is tripped.

IntermediateFull instructions provided3 hours787

Things used in this project

Hardware components

5 mm LED: Yellow

Jumper wires (generic)

Seeed Studio Grove - PIR Motion Sensor

Particle Photon

Buzzer, Piezo

Portable charger

Software apps and online services

Particle Build Web IDE

ThingSpeak API

IFTTT Maker service

Google Sheets

Fritzing

Hand tools and fabrication machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Story

Are you afraid of your residence being broken into and losing your valuable belongings? This project is aimed to prevent just that.

Video demonstration:

Purpose

As someone who has experienced a break in, we understand the worry of loosing valuable possessions. The security system was designed with that in mind. The best part about this system is that it is both simple to build and low cost. This security system uses 2 Particle photons that communicate with each other in order to alert you of an intruder. The system utilizes a very sensitive PIR sensor to insure no threat goes undetected.

Key Features

There are few parts to this design, however; each one plays a big part in the system.

PIR Sensor

First you have the PIR sensor. This sensor has a 120 degree field of view which makes it impossible for a person to avoid detection. It also comes as a prepackaged part that only requires 3 connections. The decision to use this model was to simplify its integration into a small breadboard. Having a simplified design makes the project much more approachable and user friendly.

The back of the PIR sensor. This shows how it is a prepackage sensor that only requires 3 connections.

Particle photon

This design uses 2 Particle photons to have different tasks. The "photon 1" is connected to the PIR sensor and its job is to detect movement and send the information to the other photon. This information is just 1s and 0s which indicate if the sensor is tripped.

Photon 1; This photon is connected to the PIR sensor to detect motion.

The other photon, "photon 2" receives the information from "photon 1" and uses that to set off a buzzer and alert your phone. The data that is received is eventually plotted into Google sheets using IFTTT.

Photon 2: This photon alerts your phone and sets off a buzzer when the PIR sensor is tripped.

Buzzer

The purpose of the buzzer is to give an alert to the intruder. This buzzer has a high pitch noise that was selected to spook any person that sets it off (it even spooked us during the building process). The buzzer can be heard in the demonstration video.

Data Collection

The photon data that "Photon 2" received and sent out.

The data from the photon/tinker app gets pulled and used by IFTTT. IFTTT then projects it into a google sheets graph. An example of the data can be seen above.

This video shows how to set up the IFTTT program.

IFTTT setup video, Credit: John's DIY Playground

Conclusion

Some people don't think that they need a security alarm system until their residence is broken into and possessions were stolen. This project is a cheap solution to try out the benefits of a security system. This security system was designed with simplicity and cost in mind because lots of people can't afford a security system from companies such as ADT and CPI. We took the time introduce those people to the world of security alarm systems in order to show the importance of keeping your possessions safe.

Code

// Buzzer/LED alarm

//parameters
int inPin = D0;              
int ledPin = D7;                
int pIRstate = LOW;             
int val = 0;                    

int ResetTime = 8000;      
//led signal config
void setup()
{
  pinMode( ledPin, OUTPUT );
  pinMode(inPin, INPUT);     
}
//sensor feedback config
void loop()
{

 
  if ( calibrated() )
  {
    readTheSensor();
    
    reportTheData();
  }
}

void readTheSensor() {
  val = digitalRead(inPin);
}

bool calibrated() {
  return response() - ResetTime > 0;
}

void reportTheData() {

  
  if (val == HIGH) {

    if (pIRstate == LOW) {
     
      Particle.publish("ezeIR", "1");
      
      pIRstate = HIGH;
      setLED( pIRstate );
    }
  } else {
    if (pIRstate == HIGH) {
     
      pIRstate = LOW;
      setLED( pIRstate );
    }
  }
}

//end
 void setLED( int state )
{
  digitalWrite( ledPin, state );
}

// Photon1-PIR_Motion sensor


//parameters
int inPin = D0;              
int ledPin = D7;                
int pIRstate = LOW;             
int val = 0; 
int ezeIR =1;
int led = D7;

//photon LED config
int calibrateTime = 5000;      

void setup()
{
  pinMode( ledPin, OUTPUT );
  pinMode(inPin, INPUT);
  Particle.subscribe("Recieved", Recieve, "2d002d000947373034353237");
}
void Recieve(const char *event, const char *data)
{
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  delay(1000);
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  delay(1000);
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
}
void loop()
{
//Sensor breach parameters
  
  
  if ( calibrated() )
  {

    readTheSensor();

   
    reportTheData();
  }
}

void readTheSensor() {
  val = digitalRead(inPin);
}

bool calibrated() {
  return millis() - calibrateTime > 0;
}

void reportTheData() {

  
  if (val == HIGH) {

   ezeIR= ezeIR;
   Particle.publish("Intruder_Alert", String(ezeIR));
   delay(10000);
   }
   else if (pIRstate == LOW) {
     ezeIR = 0;
    }
}
//end
void setLED( int state )
{
  digitalWrite( ledPin, state );
}