I designed a custom wireless ZigBee carport controller, in order to minimize risk of accidentally locking ourselves out of the house. I decided to use the XBEE3 MMT chip, as these are compact, easy to use and receive regular firmware updates from the manufacturer Digi. They also support security features and have AES encrypted communication.

Opening and closing the carport from a custom PCB is fairly straight forward, just add another switch in parallel with the one that's already installed in the wall. I however also wanted a feedback, to check if the carport is fully closed or not.

After checking my carports manual, I discovered that it had a 24V output, which get's enabled whenever the port is fully closed. So this signal is high, when the port is closed. This signal is low, when the ports is opened or not fully closed.