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Bluetooth Low Energy Garage Opener
The concept behind this project was to come up with a way to wirelessly open my garage, using power from the typical two-wire push button panels that come with most garage mainboards.

One challenge in achieving this goal was that drawing power too quickly will result in the garage mainboard sensing a short and removing power from the wires. So, I included an RC circuit with a trim pot and large capacitor to allow the device to run from the capacitor without surging too much current.

Another challenge was in finding a device to regulate the power off the 2-wire interface (mine was about 17V, but I wanted to enable a range of voltages for other potential garage mainboards I may use this on in the future). I ended up using a hysteretic PFET buck regular from TI for this (LM3485, 4.5V - 35V range).


Image 1
The final product...

Image 2
Beginning to solder the PCB...

Image 3
The back of the PCB...

Image 4
3D printed case to house the PCB...

Image 5
3D printed case to house the PCB...

Image 6
Arcade button (snaps in)...

Image 7
Arcade button (snaps in)...

Image 8
Old 2 wire push-button garage opener...

Image 9
Inside of the finished product (the LED turns green when the garage has been opened)...

Image 10
Sending the open command to the device via my phone...

Source code available here