Automatic Window for Cat

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My window spans two floors, giving me a significant advantage. The window won't open far enough for anyone to slip inside, allowing me to install the stepper motor on the second floor where it's out of the way. I installed the stepper motor upstairs and secured it with only one screw so it can rotate freely. This is essential because the window frame doesn't move in a straight line but along a curved path. It also enables you to remove the threaded rod from the nut holder, allowing for manual opening and closing of the window. To attach the threaded rod to the stepper motor's axis, you'll need couplings; my stepper motor has a pulley attached, so I used the couplings I uploaded. For standard stepper motors, search for Z couplings on Thingiverse to find plenty of options. I used a lasercutter to cut out the nut holder pieces from 5mm birch plywood and drilled a small hole at the top for securing the threaded rod with a pin. By removing the pin, you can manually open the window by moving the threaded rod out of the nut holder. Now that you have a motor capable of opening and closing windows, it's time to focus on the electronics controlling the motor. I utilized an Arduino Uno paired with a shield that allowed me to connect a stepper motor, two sensors, a 12v power supply, some LEDs, and a stepper motor driver. The shield was crafted from a piece of prototyping board, which you can find in the documents along with the schematics and code for the Arduino Uno. To link the PIR motion sensors to the shield, I repurposed an old network cable featuring eight threads, using only six of them.