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OpenEnergyMonitor is a project to develop open-source energy monitoring tools. These tools can be used to help us relate to our use of energy, our energy systems and the challenge of sustainable energy.

OEM system emoncms2.png

Technical Documentation

This wiki is for up-to-date technical documentation for the various hardware and software modules of the OpenEnergyMonitor project. Please add, edit and improve content. See for main project website

Hardware Modules

Monitoring Nodes

emonTx V2

Copper pipe banged flat at the end with a hole dilerld for the temperature sensor: very neat. Did you put any paste or anything in the pipe to improve the thermal connection to the sensor?What are the black cuboids on the strip board, relays for the fan and engine cutoff? I assume by generator safety unit you mean something to stop the engine if it's getting too hot?

Base Stations



Raspberry Pi

Control Nodes

/ Thanks for the post. I understand your ftsturarion with people mis-quoting the actual words of Dr. Mehrabian. However regardless of the true' percentages, communication still is more a matter of how' you say something, not what' you say. This is easily understood as our voice tone and non-verbal communication (which I'm sure you will agree is a lot more than just body language) create much more of an attitude, feeling, vibe etc. than the mere chosen words. That is also why the easiest form of mis-communication takes place in emails, texts and posts. It is very hard to relay a sender's true feelings this way. This is why emoticons are so popular. At the end of the day, in my opinion, the 7-38-55 can be thrown out if you like, but not the approx. division of how we communicate.Thanks for the great post keep up the good work.

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