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Knock on one Knock Knock box and the other box knocks too (try saying that three times fast). It’s like they’re a single object that somehow appears in two places at the same time. Magic!

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How do I know the device is working?

I am trying to check the devices work or not. When I tap first device, the first device’s VCC right on MOSFET module turns on, but I can't see anything from second device or both devices of solenoid.

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It’s worth checking if both of your devices are successfully paired and connected to the internet. You can do that by tapping the BOOT button on the ESP32 module, and checking if the blue light flashes on the other ESP32 module, and vice versa. If that’s all working, double check your wiring, particularly the piezo sensor part. Hope that helps!

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Risa will be eternally grateful.