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Honey, Get the gun!

Made by Dan Porter

Found in Home Hack

My wife and I like to travel but when we are away from home she worries about someone breaking into our apartment. I built a device that is placed near the front door and detects motion. When motion is detected an LED turns on and an alarm tone sounds to scare off the intruder. An SMS message is also sent to my cellphone informing me that someone has entered my home.

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Process

Various components were tested prior to selecting the PIR sensor including a hall effect sensor as well as a reed switch.  The PIR sensor was selected due to personal interest in this technology and easier conceal-ability of the device near the door.

I tried hacking other existing code for similar devices but all the code I was able to locate was more bloated than I needed. I ended up created the code myself which require much less debugging. 

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Product

Hardware

Particle Photon microprocessor 

Breadboard

PIR sensor

LED

Piezo

1k ohm Resistor

Wiring for breadboard


Software

build.particle.io was used create the code and flash the Photon microprocessor.  

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Reflection

The key takeaway from this project was that Particle devices can experience uncommon and difficult technical issues when trying to connect to a secondary wifi network as well as a Windows serial monitoring.  I was able to work around these restrictions but will be resolving them soon. 


Future work on this project will include a portable power supply and optimized timing in digital reads as well as SMS output. 

Additionally I would like to enable two way SMS so that I can send commands to turn on, off, and report motion activity measured.

If I were to make this over-the-top crazy, I would create a preset library of .wav files, add a speaker to the circuit and have associated SMS words that I would send to the device to piece together my own sentence to speak to the intruder. 

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int inputPin = D1;              // choose the input pin (for PIR sensor)
int ledPin = D0;                // LED Pin
int piezo = D2;                 // Piezo pin
int val = 0;                    // variable for reading the pin status

void setup()
{
  pinMode( ledPin, OUTPUT );
  pinMode( inputPin, INPUT );     // declare sensor as input
  pinMode( piezo, OUTPUT );
}

void loop()
{
  val = digitalRead(inputPin);
  if (val == HIGH){
    //digitalWrite(piezo, HIGH);
    digitalWrite(ledPin, HIGH);
    delay(1000);
    tone(piezo, 2551, 2000);
    Particle.publish("Intruder")
  }

      digitalWrite(ledPin, LOW);
  delay (2000);
}
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About

My wife and I like to travel but when we are away from home she worries about someone breaking into our apartment.

I built a device that is placed near the front door and detects motion. When motion is detected an LED turns on and an alarm tone sounds to scare off the intruder. An SMS message is also sent to my cellphone informing me that someone has entered my home.

Created

February 1st, 2017