lunedì 27 luglio 2015

Mjölnir - the open source energy advisor


We recently announced the release of the stable version 0.2 of our open source energy management system Mjölnir at http://mjoelnir.sourceforge.net.

While the tool targeted so far mostly "disaggregated" device-level energy and power usage, we have recently introduced full support for circuit-level measurements (buildings, rooms) which unlocks a considerable potential for further data analysis.
The DIN-RAIL module running the measurement system

As most of energy meters use the industrial automation system ModBus, we have been looking for possible shields to extend our open hardware solution with RS485 communication. We finally selected this RPi hat from Libelium while the meter is the Carlo Gavazzi EM24. The implementation is eased by the Libelium ArduPi library, which makes the C code written for Arduino compatible with the Raspberry Pi. The data is then being sent to our servers through a REST interface.

The overall component shown on the picture is therefore a low cost solution able to retrieve remote measurements via the RS485/ModBus and the USB/ZigBee network. This opens for the future integration of other measurement units, such as water and gas meters.

The support of circuit-level measurements required changes on the Mjölnir system.

The system is now organised in buildings, rooms and devices. A circuit is described by its ID and can be associated to a single building or room.

The just introduced device control is implemented using web sockets, so that both the dashboard and the gateway can keep a TCP connection open to publish/subscribe for events. This seemed the lightest and easiest-to-develop alternative to XMPP, RabbitMQ (AMQP) and MQTT.

Below is a video providing a walk through the system.


As usual, the code of the gateway is available on source forge, along with the dashboard system.

Bibliography:
  1. A. Monacchi, F. Versolatto, M. Herold, D. Egarter, A. M. Tonello, and W. Elmenreich. An open solution to provide personalized feedback for building energy management. ArXiv preprint arXiv:1505.01311, 2015.

1 commento:

  1. Thanks for the useful information. Your article is beneficial for us and those who are searching for Energy Advisor.

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