How to connect more than one piezzos at a time to Arduino Uno?

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1

Hi there,

Sorry I'm really a newbie as I'm more into music but it's a really important part of the project.
As I understand it's quite simple to connect a piezzo pick-up to Arduino Uno. What I have in mind is how to connect two or more of them onto the board? I mean is that possible?
The reason why I ask is as how I see here http://arduino.cc/en/uploads/Tutorial/knock_bb.png
I need two grounds and one analog in to connect one piezzo? But how if the resistor and the piezzo's wire are soldered? Or is there anything wrong with that picture? =) What if I'd like to use two or more piezzos? Are there any space left for ground? As far as I see there's only two possibilities for the ground, so if I use two grounds for one piezzo (as the picture shows if it's correct) I won't be able to connect even another one. Or is that alright to use one ground for more than one analog in?

Thanks for reading!!

Latz

2

There's actually only one ground, but there is more than one ground pin (connected together on the circuit board) All of the external grounds should also be connected together. If you have a multimeter, you can measure the resistance between the Arduino's ground pins to confirm there is zero resistance between the ground pins and that they are all connected together.

If you use more than one piezo, the "hot" (signal side) of each piezo needs it's own analog input pin.

Of course, you'll have to modify the sketch to read more than one analog input.

3

Thanks very much indeed!