I wish the documentation was a bit better, but finally got it working. I'll be using this to measure sleep restlessness in my autistic 4 year old boy attaching it to the underside of his bed. A very nice and inexpensive way to get some quantifiable data on night waking patterns.
The board was really easy to configure, and I was able to integrate it into my Fibaro smart home system as a virtual device within minutes! I'll order more in the coming months. Documentation is minimalistic - I'm missing power supply spec and more details about LUA programming options.