emonTH3

Introduction

The Energy Monitor Temperature Humidity 3 (emonTH3) is an ultra low power temperature and humidity monitoring node with support for pulse counting and additional external sensors.

It is an update to the OpenEnergyMonitor emonTH2 with the following goals:

• Increase the battery life from the current ~4 years on 2xAA
• Update to modern components
• Reduce the overall cost of the system
• Provide user expansion for other sensors

It should be used with the emonTH-fw firmware.

Getting started

The board is designed using KiCAD version 9. The schematic and floorplan are provided as PDF files. If you want to render your own files, run ./generate.py. This produces Gerber files as well as KiCAD PCB and schematic files tagged with the git commit for traceability.

[!NOTE] The emonTH3 will be available fully assembled and programmed from the OpenEnergyMonitor shop.

Feedback and Issues

These can be reported:

• as a GitHub issue
• on the OpenEnergyMonitor forums

Contributing

As the hardware design flow doesn't quite follow as nicely as software, if you want to contribute a change, please raise an issue as described above and we can collaborate.

After cloning the repository, run ./install-hooks.sh to add the render on commit.

References

• CC-Antenna-DK and Antenna Measurements Summary
• Camden Boss CBRS01VBK datasheet

Acknowledgements

• Glyn Hudson and Trystan Lea @ OpenEnergyMonitor
• Gordon Davidson @ OpenEnergyMonitor Forums