Reading SDM120C Power meter

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Reading SDM120C Power meter

Postby ovdleun » Wed Jul 27, 2016 8:44 pm

Hi all,

I've bought a Eastron SDM120C power meter. it has also a pulse output on two pins (pin 6[-] and pin 7 [+]); However, how can I read the pulses? I tried to measure by connecting the + to a GPIO pin of my ESP12E, however it does not see it as a low/high voltage / interrupt. So anyone an idea how to count the pulses? I've heard about something link open collector, I've read the info page on that but still don't know how to use it with ESP12E / NodeMCU.

Any help appreciated. If one needs more information about the meter, please let me know.

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Re: Reading SDM120C Power meter

Postby eDsuB » Fri Nov 17, 2017 5:01 pm

What you need is a device that counts the pulses generated by the meter: The S0PCM-5 module of smartmeterdashboard can do that
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Re: Reading SDM120C Power meter

Postby raymonvdm » Fri Nov 17, 2017 5:56 pm

I think you need to connect the GND on one pin and a GPIO on the other pin. I think the S0 interface is acting like a littel switch
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