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Topic: Piezo Vibration Sensor with 1M ohm resistor (Read 42 times) previous topic - next topic


I found a sketch for Knock on the Arduino site for a vibration sensor. 

This is what I have:

It calls for a 1Mega ohm resistor, which I dont have.

Then I found this sketch:

Of course there is no responsibility claim on either sketch but I inclined to think the second sketch is a bit more risky.  Im unaware of how big a risk it would be to NOT use a resistor.

Anyway, is there a way to test this without a 1megaohm resistor?  Could I wire up resistors of smaller capacities to make a 1megaohm resistor?  Could I just use my largest one, which is a 33kohm resistor.


In this case the physical size does not matter as the power is so low. What you need is a total R of around 1M. This can be done by adding R's in series. Anything of above 470k will probably be ok.



OK then I'll have to just buy a 1M because 33k would to much.  10 just to get to 330k!

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