Nano with dual coil relay

[TomGeorge]

Hi,

@david_2018

I do not see anything in the data sheet that states a reverse-polarity coil will be non-conducting, and if it were non-conducting then wiring the coils in series would seemingly also prevent the other coil from conducting at that point.
If you absolutely have to use an H-bridge, then wiring the coils in parallel, with reversed polarity, and diodes in series with each coil to only allow current flow in the correct direction, might work, but between the diodes and H-bridge the voltage drops are starting to add up.

Believe me, they do not conduct with reverse polarity, so parallel without the steering diodes will suffice. (The relays have the diodes built in.)

Tom.....