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Problem statement: I am designing this solution for all my friends who stay alone in an apartment. Many times when they are out for college, they get worried what if someone tries to break into their apartment. Hence, I am designing a solution for them so that they can keep a check on their home safety. If someone tries to enter their house, they will be notified about it via their phones. This way, they could take immediate action as well.

Goals: I am trying to design a device which would be right next to the door and will be activated by the owner once he leaves the house. It will be directly linked to his phone so that he could be notified as and when someone tries to enter his/her house.

Precedents

Photon home alert system - by Shawn Osborne and Tracy Easter https://particle.hackster.io/29519/photon-home-alert-system-39a289?ref=search&ref_id=home%20safety&offset=0
College Friendly Security system- by Aidia Naim, Thomas Joyce and Babiker Suliman https://particle.hackster.io/30375/college-friendly-security-system-e75394?ref=search&ref_id=home&offset=43

Process: Since this was the very first IoT project I was doing, I started with a very basic circuit and code and built upon it as I progressed. The first phase included having only PIR sensor and a LED which glowed when the sensor detected someone. Once this worked out properly, phase 2 included implementing a Piezo buzzer as well to add to the output. The third phase included giving it a more visual appeal. It was done by replacing the normal LED with an RGB LED which was green when no person was there but turned red and buzzed when it detected a person.

Outcome: The final bill of material consisted of following parts:

PIR sensor
Breadboard
Particle Photon microprocessor
Jumper wires
RGB LED
Piezo buzzer
Resistors

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int inputPin = D0;              // choose the input pin (for PIR sensor)
int redLed = D1;
int greenLed = D3;                // LED Pin
int speakerPin = D2;            // Piezo pin
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status

int calibrateTime = 10000;      // wait for the thingy to calibrate

void setup()
{
  pinMode( redLed, OUTPUT );
  pinMode( greenLed, OUTPUT);
  pinMode( inputPin, INPUT);     // declare sensor as input
  pinMode(speakerPin, OUTPUT);
  Particle.publish("hardikpatelpir");

}

void loop()
{

  // if the sensor is calibrated
  if ( calibrated() )
  {
  // get the data from the sensor
    readTheSensor();

    // report it out, if the state has changed
    reportTheData();
  }
}

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

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

void reportTheData() {

  // if the sensor reads high
  // or there is now motion
  if (val == HIGH) {

    // the current state is no motion
    // i.e. it's just changed
    // announce this change by publishing an event
    if (pirState == LOW) {
      //Particle.subscribe("hardikpatelpir2");
      // we have just turned on
      // Update the current state
      digitalWrite(greenLed, HIGH);
      digitalWrite(redLed, LOW );
      tone(speakerPin, 2000, 1000);
      delay(1000);
      digitalWrite(redLed, HIGH);
      digitalWrite(greenLed, LOW);
      pirState = HIGH;
      //setLED( pirState );
    }
  } else {
    if (pirState == HIGH) {
      // we have just turned of
      // Update the current state
      pirState = LOW;
      digitalWrite(greenLed, LOW);
            //setLED( pirState );
    }
  }
}

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

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Reflections

Initially, I was very scared about doing an actual working prototype in a week since I had never touched electronics or coding before. I decided to learn first from the IoT lab website before starting my project and I was very impressed by the lab website content. The diverse guides and tutorials made me very familiar with the different components. After that, I started building progressively. I started with very basic circuit and fewer components and kept adding more stuff as I learned. I was not able to meet all of my goals because without realizing the scope of things. I had planned on a camera taking image of the person who enters and sending it to my phone. I was able to realise IFTTT and used it to send message but could not work out the image thing yet. With further learning I get in the course, I am confident I would be able to incorporate much more advanced stuff as well.

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