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Member Since: July 17, 2011

Country: United States

  • Please consider reading the datasheet.

  • What about low temperatures? Will this stuff stay sticky below freezing? The datasheet only seems to mention the maximum of its rated range.

  • This is a good breakout! I get a nearly full swing from minimum to maximum ADC value when speaking into it at normal volume. Here’s a plot of the ADC response from me saying “Mississippi one, Mississippi two”, using 8-bit conversion, 5V Vcc, 5V ADC reference voltage, and as high a sampling frequency as I could muster on an ATmega328P.
    You can see that it covers almost the whole 8-bit range from 0 to 255. The mean value is only slightly offset from the ideal of 127, being around 150… this is easy enough to adjust for with some calibration code.
    My only complaint is that I wish they’d used a microphone with a slightly better low-frequency response… this one rolls off below about 100Hz, which is not ideal for working with human speech… I would rather it went down to about 20Hz. Jameco sells such mics for only pennies more than the 100Hz+ mics, so I suppose I could replace the mic on this board with one of those.

  • Slightly noobish question. I’m interested in experimenting with different bandwidths on this chip, which the datasheet says can be selected by placing different capacitances between the x,y,z-outputs and ground. The breakout board comes with 0.1uF capacitors pre-installed, corresponding to a bandwidth of 50Hz. If I wanted to lower the bandwidth, which requires increasing the capacitance, I could just put my own capacitors in parallel with the on-board ones, right? And if I want to increase the bandwidth (lower capacitance), I could put my own capacitors in series with the on-board ones, right? As I understand it, putting capacitors in series will change the overall working voltage of the circuit – won’t this complicate my interpretation of the accelerometer output? i.e., the 0g voltage level, and volt/g response will no longer be as described in the datasheet? Could I damage the chip?

No public wish lists :(