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:

1. Test/verify the pcb board correctness(from both electrical and mechanical point of views) - TO DO
2. Produce the initial PCB's using some external PCB manufacturer
3. Components assembly(soldering)
4. Upload Mysensors temperature/humidity node sketch code
5. Verify the real board with running code
6. Code optimizations for low power operation
7. 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