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The LM339 just pulls to ground when activated. Doesn't send 12V
Thanks. I also thought of using opto couplers to sperate the voltages and ground in case something goes wrong. I'm planning on using opto couplers from the alarm outputs for siren and another output which triggers on alarm armed so I can monitor the states as well. I think I will also need to use a different board maybe even esp32 with more inputs.