I’ve been working with my flatmate recently on getting our apartments communal door open with a Particle Photon, it works a treat!
The full write up, with pictures, can be found at https://www.hackster.io/main-thread-technology/photon-powered-communal-door-b5d1d2.
It was the first time I’ve built a PCB, and it was a great experience going from a prototype to a mostly polished final implementation, still a lot to learn there though.
I’m also looking for some review of the firmware if anyone’s interested at https://codereview.stackexchange.com/questions/125994/particle-photon-c-firmware-to-trigger-relays.
Just want to say thanks for writing such good documentation, it’s helped out a ton!