I have been watching the development of mmWave modules. I am interested on it because its capability to detect stationary human presence.
Recently, I notice that the availability of such modules are becoming more common. So I thought I would make a Zigbee solution that would take one of the off the shelve mmWave module and make it available as occupancy sensor for our hub.
Here is my first board for it. It was designed for DFRobot sen0395 module. It is out of stock everywhere. I am getting a similar module from Aliexpress as we speak. I do not have one on my hand yet. I am testing it with my 5.8GHz radar based motion sensor. Here is the first board.
It is AC powered.
I designed it to be installed in electrical box. I will eventually install it next to my wall switch in the room that I like to monitor.
The Zigbee firmware is being tested. I am able to pair it with our hub
I am using nrf52840 for the Zigbee module. This is reasonably newer MCU which support thread(matter). In the future, if I happen to run matter in my house, I want to make sure the sensor is capable to support matter.
I am still very early in this project. I am in the process of getting mmWave modules to evaluate. If everything goes well, I may have boards that I can share with the community.