A smart pet door.

A project I made in my junior year of highschool to controll when to let my cat into the house. I live near a forest and my cat is an avid hunter who enjoyed to bring his catch inside the house through a wooden pet door I hand made and installed. In order to stop my cat from bringing the dead animals inside the house I decided to make a "Smart Pet Door" to manage my cats ability to enter the house.

I decided to modify our existing pet door to make it possible to controll what gets inside the house.

• I installed a solenoid lock on one side to block entrance inside the house when the solenoid is in its passive position.
• The solenoid needed more power than the pi could supply, so a seperate power source (12V power adapter plugged into the wall) was used along side a relay to controll the solenoid (on or off).
• I installed a small PIR motion sensor pointing to the outside right beside the entrance to detect if my cat wants to go inside the house.
• I also installed a cheap webcam pointing about at the spot where my cat would be if he wanted to get inside the house through the door.
• As the brains of the cat door I installed the Raspberry Pi 1 with a wifi dongle stick.

The pet door would detect movement near the entrance and instantly take a picture with the webcam. The raspberry pi would then send a GCM notification (using Google's GCM service) to my Android phone. On my Raspberry Pi I run a local server with python, using Django, that uploads the snapshot to an index of the server. I coded an Android app that consists of only a picture display and a button. The app downloads the picture from the local server through an asynchronous task to display if the cat is holding some sort of animal in his mouth. If I want to let my cat in, I simply press the button on the UI that accesses another index on my local server which sends a signal using the GPIO pins to a relay to power on the solenoid for a set time period to unlock the door and let the cat inside.

The "src" folder contains the java code and manifest files for the Android Studio app code.

Unfortunatly I no longer have the code I used on the Raspberry Pi. Basically, I set up a very simple Django local server with 2 indexes, "open" and "pic.jpg". If the "open" index was accessed (the user pressing the "open" button), the Pi knew to trigger the relay with a GPIO pin. The "pic.jpg" index just displayed an image stored in the folder with the python script which would be an image the webcam takes. While the server is running, I have a threaded loop listening for a HIGH signal from the motion detector. If a signal is recieved, the Pi triggers the webcam to take a picture and save it as "pic.jpg", overwriting the old picture, and the Pi also sends a GCM message to the user's phone.