RFM69 Multisensor Node (CR2032)
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Attribution-ShareAlike (CC-BY-SA)
Created:
8 years ago
Updated:
4 years ago
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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