Member Since: February 17, 2010

Country: Greece

  • Could this be cut in its separate pieces?

  • I was also confused about that but I found the answer in the "Technical Manual" you can find above. Check out page 37, "Input Resistance". Basically, the equivalent for this sensor is a voltage source in series with a capacitance. This capacitance combined with the input resistance of your Arduino (or any other circuit you're using for measuring) creates a voltage divider. So as the capacitance increases (this depends on the frequency of the vibrations) the output of the sensor decreases. That's why you have to choose a resistor that will minimize this effect -- so-called "loading effect" http://en.wikipedia.org/wiki/Voltage_divider#Loading_effect
    Someone correct me here if I'm wrong but as I get it we're not using the resistor to limit the current that goes in our analog input but for the reason I stated above.

  • I connected the red lead to the positive of my multimeter and the black lead to the ground. Shouldn't I be getting some voltage by knocking on it? All I get is a few millivolts (negative values too). I used it with a 2.2 KΩ resistor.

  • Anyone?

  • Dear SparkFun,
    do you think we can get those before March? I would like to place my order using credit from the FreeDay ;) And I'm just waiting for this little thingy :)

  • they look great!
    it's a pity I'm short sighted and I have to wear my regular glasses all the time. I guess I can't fit these on top..
    or can I? :D

  • Can we get these in other packaging formats? :) thanks!

  • Thank you!
    We <3 SparkFun ;)

  • If I connect this to my PC directly, using the RS232 port, do you know how do I make the avrdude recognise this board? Or do I have to use a separate programmer?

  • Hi,
    newbie here,
    I want to control 4 RGB LEDs with a small microcontroller. Is it possible to do it with this one? I didn't understand from the description or the datasheet if this micro supports PWM outputs.