It's a simple homemade board with those specifications:

Size : 29.8 x 44.8 mm

Content :

Atmega328p RFM69 SI7021 APDS-9306 Sensor power on/off Led Optional : Flash Optional : Atsha204a Optional : Advanced low power management Optional : External Battery measurement (voltage divider) Optional : External pull-up for door switch Some pin to add external sensors Started with a big board and removed everything on it but what I needed the most. I'm thinking about removing atsha, advanced power, external battery measurement because I will probably not use them. (atsha indoor is pretty much useless) Remove Flash too, if OTA is developed for RFM69 (I may try to help with this development)

Actually connected to a raspberry 1 with MySensorsGateway + Mosquitto (Will probably move to WEMO or something else, raspberry not working well for the moment) My controller is Home Assistant

I will not release any board/sketch before I feel the project is mature enough but...

I released my new libraries for SI7021 and APDS-9306 full rewritten from scratch with async programming in mind. https://forum.mysensors.org/topic/9010/async-sensor-libraries-si7021-apds-9306