SparkFun Forums

[balam]

I have been trying to use this with an arduino.
but not able to make it work ( do not see the polarity )

have fallow this tut
http://www.arduino.cc/en/Tutorial/Knock


so far does not work
any ideas

thank you.

[coyote20000]

If you can, take a picture of your circuit and post it here.
I wanna see what you have so far.

[balam]

thanks
I will take a pic and post it soon.
this is piezzo that I am using

http://www.sparkfun.com/commerce/produc ... ts_id=9196

[coyote20000]

According to one users comments.
Negative is on the tabbed side.

http://www.meas-spec.com/downloads/LDT_Series.pdf

I assume you have a 1meg ohm resistor in parallel?

[Selenaut]

Hook it up like a normal sensor, and monitor it until it puts out a specified voltage. Be careful though; that thing could fry your circuit to irreparable proportions (90V, holy crap!).

-Selenaut

[Selenaut]

Hook it up like a normal sensor, and monitor it until it puts out a specified voltage. Be careful though; that thing could fry your circuit to irreparable proportions (90V, holy crap!).

I assume you have a 1meg ohm resistor in parallel?

That would help... a lot. It all just depends on how much voltage it puts out for a certain amount of dB's, and what you are trying to do with it.

-Selenaut

[balam]

thanks
do you guys have a pictures of setup.
so I can fallow them.
thank you.

[balam]

here is pic.
basically is the piezo set up.
still not working
if i use a regular piezo element , it works.
http://www.arduino.cc/en/Tutorial/KnockSensor

but not using the piezo bration sensor
http://www.sparkfun.com/commerce/produc ... ts_id=9196

[coyote20000]

What values do you get from the one that doesn't work?

If your sketch is set up with a certain threshold perhaps it's not hitting it.

Try dropping the threshold, or printing the ADC value.

[balam]

thank you
that seems to some how work
Lowering the values to 10 = no serial print
lowering to 20 = get some feed in serial print
lowering to 30 = no serial print.

what values do you recomend for this.


I am using the default knock form arduino software

thank you

[coyote20000]

Start at 100 and maybe decrease by 10 till it works reliably. Just keep adjusting till its where you like the response. The flex sensor must put out less signal than a standard piezo.