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I notice by the datasheet and the schematic that it is the same either direction. I was also noticing that the grounds are the same. I was also thinking if beep the ground legs I could find out which way it goes. But the two grounds don't beep. But looking at the datasheet the grounds aren't connected inside so I get no beep. And it looks like it is two separate things in one and the same either way you put it.
Is this thinking correct? Or will it only work one way and I have to try both to see which one works?