Mysensors RFM69W multisensor node(CR2032)
Description:
This is a Mysensors node using RFM69W radio module, Si7021 temperature/humidity sensor and MAX44009 ambient light sensor.
Key Features:
- Si7021 temperature/humidity sensor
- MAX44009 ambient light sensor
- A3212 micropower hall sensor(this is not a low voltage sensor as it requires 2.5V min to work - there's the A1171 variant but it's a DFN package)
- ATSHA204A for signing
- AT25DF512C-SSHN-B SPI flash module for OTA
- MySensors ready(Atmega328p + RFM69W)
- DC-DC boost converter(NCP1402 based) - can be bypassed using the on board jumpers
- Small board(36mm diameter) using a CR2032 coin cell
Work progress:
- Test/verify the pcb board correctness(from both electrical and mechanical point of views) - TO DO
- Produce the initial PCB's using some external PCB manufacturer
- Components assembly(soldering)
- Upload Mysensors temperature/humidity node sketch code
- Verify the real board with running code
- Code optimizations for low power operation
- Create project enclosure using a 3D printer
** Tested and it works! **
HW Revisions:
- 0.1 - initial design
- 0.2 - added option to bypass step-up converter using jumpers
- 0.3 - added MAX44009 ambient light sensor
- 0.4 - added A3212 hall sensor
Credits:
All credits go to MySensors team for the great work and to the opensource community