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I accidentally let two of the valve wires touch when testing, sending 24 volts back to the OpensprinklerPi via one of the outputs. I let the smoke out and I just can’t get it back in :-). Beware this error.
Alas, sorry to hear that. 24V AC is indeed a somewhat dangerous voltage to work with. In fact, since many adapters output close to 28V AC voltage, and the peak is 1.414 times that, so the peak voltage can be as high as 40V, and that’s beyond the 36V safe zone. If you put your figure across the transformer wires, you can often feel the tingling on your fingers…
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