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Energy data acquisition from multiple units

Hi there, I would like some advice on the easiest way to monitor pulse outputs from up to 20 industrial panel mounted kWh meters. The meter gives a single pulse per kWh with a minimum duration of 100ms. It’s quite a slow pulse rate say 20Hz max. I was thinking of using an Arduino Uno but digital inputs are limited. I would like to be able to send the data via LAN in .csv format as a report. Any guidance would be greatly appreciated.



I used the 12 input pulse counter for multiple input pulse counting.
I wired it direct serial instead of wireless.
The hardware design and code can be found in the Learn section.

https://learn.openenergymonitor.org/electricity-monitoring/pulse-counting/12-input-pulse-counting

Hi there. Thanks for getting back to me. This looks just what I need. Would there be a way to expand the number of inputs to 20?

Not with the ATMega328, I think 12 is the max Digital Inputs available.

How about Arduino Mega 2560 Rev3? It has 54 digital inputs?