can I use 11 and 12 pin for pzem-400t while using ethernet shield? can It work together? thanks for fast response guys
That depends entirely on the ethernet shield and the Arduino you are using, about which you say nothing. That said, pzem is a serial device and can be used on any pins that will support a serial connection, so where is the problem? Pins 11,12 would be a fatal choice on a Uno, as that is the SPI bus.
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