Percussion

If someone is looking for a good way to do a drum type input to their project I can also recommend this circuit I found earlier in the year. It works nicely with some LM393 comparators.

Enchanted Objects Design Challenge - Knock Knock

http://www.scienceprog.com/thoughts-on-interfacing-piezo-vibration-sensor/

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DAB over 9 years ago +1

Interesting. I happen to have some LM393 chips. I might have to dig them out and try this circuit. Thanks DAB

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D_Hersey over 9 years ago

Sorry, I am not sure what the Zeners are for. Nor do I know Vcc.
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Workshopshed over 9 years ago in reply to D_Hersey

The zeners are there to clip the signal as it could go higher than the input range of the comparator. It's explained in some detail in the link from the original post.

Vcc is the postive power rail, which was +5v in my case. The logic levels on the beaglebone are lower, at 3.3v so you would want to use a lower level supply and also 3.3v zener diodes if you were to adapt the circuit for this challenge. The LM393 would work at that lower voltage without issue.
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Workshopshed over 9 years ago in reply to D_Hersey

The zeners are there to clip the signal as it could go higher than the input range of the comparator. It's explained in some detail in the link from the original post.

Vcc is the postive power rail, which was +5v in my case. The logic levels on the beaglebone are lower, at 3.3v so you would want to use a lower level supply and also 3.3v zener diodes if you were to adapt the circuit for this challenge. The LM393 would work at that lower voltage without issue.
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