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Automatic Garage Closer #ArduinoMonday

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From Adam Oakley on Hackaday.io:

I use my garage as a workshop and on more than a few occasions I’ve left the garage doors open and forgotten about them. This project is the solution for that issue.

Using an HC-SR04 ultrasonic distance sensor mounted on the ceiling above the garage door allows the sensor to detect if the garage door is open. When the door is open, it’s quite close to the ceiling. When it’s closed, there’s nothing close to the ceiling. With some tuning, the sensed distance can tell you if the garage door is open. Since my garage has two doors, I use two sensors to detect them.

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