OEM is a project to develop open-source energy monitoring tools to help us relate to our
use of energy, our energy systems and the challenge of sustainable energy.
The system is made up of five main units. These can be assembled and configured to work for a variety of applications from home energy monitoring to solar PV import/export monitoring and building fabric thermal performance monitoring. The system is fully open-source: both hardware and software, with documentation on everything from AC theory to sensor circuit design and application programming available in the Resources section.
The emonPi can monitor 2 x single-phase AC circuits using clip-on CT sensors. The emonPi can also monitor temperature & interface directly with utility meters via an optical pulse sensor.
The emonTx can monitor up to 4 × single-phase AC circuits using clip-on CT sensors. A plug-in AC-AC adapter can be used to power the unit and provide an AC voltage sample for real power calculations. 4 × AA batteries can be used to power the emonTx if access to AC power is not available.
The emonTH is powered by 2 × AA batteries and is available with a choice of either DS18B20 based temperature sensing or DHT22 based Temperature and Humidity sensing. An external DS18B20 temperature sensor can easily be wired into a screw terminal connector to provide external temperature readings.
The emonbase is the internet gateway, relaying readings received via wireless from sensor nodes (emonTx / emonTH) to emoncms, an open-source energy monitoring web-application (see below). The emonBase is based on a Raspberry PI, a popular low cost Linux computer. The emonBase runs a web server with emoncms installed for local data-logging to an SD card, and it can be configured to simultaneously forward data to a remote cloud server.
Emoncms.org is a powerful open-source web application for processing, storing, visualising energy and environmental data.
Here you can see and download all the various software components for your custom application: Home | OpenEnergyMonitor