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Joined 3 years ago
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Cake day: July 1st, 2023

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  • I’m not sure if you explain the specifics in the video, but I worry that you’re overcomplicating things?

    Unless there’s a reason for doing it like this to learn about something, if it’s actually working like a doorbell, then start by looking at a doorbell.

    You need the chimes (bit that makes noise or light when electricity is added), wired through the power source (i.e. batteries) in a continual circuit that plays constantly - then you interrupt that circuit with a leaf switch (a push-button).

    When the leaf switch is off, there is no circuit and no noise is made.

    When the leaf switch is pressed, there is a circuit and the noise is played.

    At the most basic level, a leaf switch is a thin bit of metal hovering a few millimetres above another bit of metal - the wire goes into the top bit of metal, and out of the bottom bit of metal (or reverse). A tiny bit of pressure joins the two bits of metal and completes the circuit, making the electric flow. When released, the two pieces of metal separate and the circuit is broken. You may need springs to move them apart.

    From that point, you’re inventing a pressure plate for a cat. Something which will press together with a cat’s weight, then spring back up when the cat is no longer on it.

    You then refine or calibrate that mechanism so it always goes off with a cat, but not with a gust of wind or spider etc.