Arduino SMS Alarm

An Arduino based burglar alarm that sends an SMS when motion is detected. It will send an SMS to you every 30 minutes while motion is detected (configurable).

Requirements

Python
Python library pyserial installed
Python library requests installed
A TelAPI account
An Arduino
A Parallax PIR sensor
Some female-female jumper wires
Some break-away headers (to convert female to male)

Set up

Wire it up!

Attach + on the PIR sensor to 5v on the Arduino
Attach - on the PIR sensor to GND on the Arduino
Attach OUT on the PIR sensor to DIGITAL 2 on the Arduino

Upload the sketch

Plug your Arduino into your computer
Open the arduino_pir/arduino_pit.ino sketch with the Arduino IDE
Select your serial port (Tools>Serial Port) and click Upload

Your arduino LED will now be blnking. This means the PIR sensor is calibrating.

Setup the server

Open server.py with a text editor
Change the value of SERIAL_PORT to the serial port you set in the Arduino IDE. For Windows it might look like COM2, for Posix systems, it might look like /dev/tty.usbserial-AH00PP05
Change the value of SMS_FROM to the number in your TelAPI account numbers (You can set this to another number, such as your own phone and it will cost a little extra. This is what I do.)
Change the value SMS_TO to your cell phone
Change the value of TELAPI_ACCOUNT_SID to your Account SID as found at your TelAPI dashboard
Change the value of TELAPI_TOKEN to your Account Token as found at your TelAPI dashboard

Run it!

Open up your terminal and run python server.py (assuming the terminal is CD'd to the directory where server.py is)
The Arduino will blink it's LED for 60 seconds. Get out of the sensor's sight while it calibrates.

Now, whevever motion is detected in the infra-red spectrum (think body heat), server.py will send you an SMS up to once every 30 minutes.