I recently (yesterday) hooked up my SH-
I recently (yesterday) hooked up my SH-ESP32 with SensESP and 2 temperature probes. I'd like to add tachometer to the data it sends to signalk. The question is can I safely just connect the wire from the alternator directly to the SH-ESP32 opto-isolator inputs, or do I need any additional circuitry to make sure I don't fry the SH-ESP-32?
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I keep forgetting the existence of the opto I/O... Yeah, it should be safe. The maximum opto input voltage shouldn't exceed 18V, but that shouldn't be an issue. And yes, you'll get a nice pulse train that's easy to count.