Spark has developed an open-source thermostat that cost just $70 to make, and it did so within a single day. That’s nothing to snub your nose at.The open source thermostat.Image Credit: Spark.io.Before I provide further details about the thermostat, it’s worth noting that the primary reason the project was done so quickly and affordably is that it was an open source project. The team was able to simply integrate an existing open-source tech ...

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http://cleantechnica.com/2014/01/27/open-source-thermostat-70

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