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A comment on Why we won't be selling Genuino or Arduino any more. Parent comment

Re:Why we won't be selling Genuino or Arduino any more by voidz on Thursday August 11, 2016 @11:49AM (#12269203)
How does it read your electricity meter?
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Re:Why we won't be selling Genuino or Arduino any more by pjc50 on Thursday August 11, 2016 @12:06PM (#12269366)
I implemented this project: https://github.com/pjc50/emon-server

The meter has a (standardised) red LED that flashes once for each watt-hour. The Pi has a phototransistor that turns flashes into a GPIO transition interrupt. I've put it on my solar panel generation meter, and plan to build another (slightly improved) unit to monitor the mains input meter.

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Re:Why we won't be selling Genuino or Arduino any more by exhilaration on Friday August 12, 2016 @12:31AM (#12273405)
Very nice, I've got a modern electric meter but had no idea this was possible.
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