[dorkbotpdx-blabber] Piezo used as an input to the arduino.

[Fred Smith]

Might not be enough detail here, but.....
http://www.arduino.cc/en/Tutorial/KnockSensor


On Mon, Jun 15, 2009 at 2:01 PM, Greg Grunest<greg at grunest.com> wrote:
> Hey all…
>
>
>
> I’m looking for the circuit that I saw somewhere that ties a Piezo buzzer to
> the input of an Arduino.  I looked at Collins projects and the circuits he
> uses are more complex than what I need or am looking for.  I’m pretty sure
> Don showed it to me, I breadborded it up and played with it.  It worked
> great and then I tore the circuit apart without writing anything down.
> ARGH!!!  It was a very simple circuit that used a resistor, a diode and the
> Piezo… I think??
>
>
>
> If anyone has a schematic or suggestions, I’d appreciate it.  I could
> probably figure it out myself but I seem to remember talk of a Piezo
> generating enough voltage to blow up the input on the Arduino so I figure
> I’d better ask first (and blow stuff up later).
>
>
>
> Other questions:
>
>
>
> 1)       Has anyone found an easy or creative way to mount the Teensy++?  My
> project needs to have it elevated above the Piezo element (so I can’t use
> long header pins because they would touch the Piezo) and I’m having trouble
> coming up with a solution.  I’ve only got a 2” x 2” x ½” space for it.  The
> best solution I’ve come up with so far is to mount the Teensy++ to another
> board using headers and then mount the board to my surface around the Piezo
> using standoffs.  I can’t permanently attach anything because I need to get
> to the circuit for reprogramming / data downloading.
>
>
>
> 2)       Has anyone tried using the Teensy++ for time keeping?  If so, how
> accurate over the period of a week?  All my experiments have been off by a
> couple of seconds every hour which is too much for my application.  I’d love
> to see code samples if anyone has some.
>
>
>
> Thanks,
>
> Greg
>
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