Kicad stuff for EMW3165 based sensor board v2. This small board has:
- EMW3165 module
- Connector for 1-wire sensors
- SWD connector for programming
- Two alternative power supplies (solder only one):
- MCP1640 step-up converter, provides 3.3V from 2 AA batteries
- MAX604 LDO regulator, provides 3.3V from 3 AAA batteries or from console FTDI
I have written two firmware alternatives for board. First is emw-meter, which displays temperatures and house power usage. Second is emw-sensor, which uses 1-wire devices to measure temperature and send it to MQTT server.
This is Open Source Hardware, licensed under CC-BY 4.0. There are some notes about the board in my blog.