×

It is that time again! SparkFun Electronics will be closed Friday, January 13th for our annual inventory day. Please keep in mind that any orders placed after 2PM (Mountain Time) on Thursday, January 12th will not ship or be prepared for local pickup until we open for normal operations on Monday, January 16th. In addition, tours will resume on Friday, January 20th. Thank you for your patience!

dimitristzortzis

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.
    thanks!
    Dimitris