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Topic: project 12 - knock lock: problem piezo read pulse of the servo (Read 1 time) previous topic - next topic


Hi everybody,

when i do a knock piezo read correctly a value, it's ok.
but i have a problem with piezo and servo. when the servo is locked, il pulses randomly short mouvment that generate signal in the piezo and make a knock.
also if i force manually a mouvement to the servo, that generate signal to piezo.
i do the same circuit in the kit book.

an idea of what hapens ?


A reply several years later.

I am experiencing the same. Movement of the servo sends a back current that registers as piezo signals. Jiggle the servo arm and that's enough to open the lock. Here is a video showing the issue...


Ideas for how to fix this?

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