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August 30, 2012
FYI, using Arduino IDE 1.6.6 seems to have issues with deprecated platform.txt and subsequent inability to locate avrdude. Reverting to Arduino 1.6.5 solves this.
Oh, now I see below: “The only differences are the voltage regulator and crystal (and a solder jumper).”
Is the only difference between the 3.3v and the 5v the voltage regulator on the RAW pin, and the software configuration (e.g. clk freq)? I see “VCC = 2.7V to 5.5V (unless otherwise noted)” mentioned on page 383 of the 32U4 datasheet. In general, can microcontrollers be powered with a range of voltages?
Specifically, I am wondering if I can run the 3.3v version at 3.6v. Thanks.
about 3 years ago
I bought two of these because I thought I accidentally fried the first one.
However, I observed that the X-Y-Z axes are centered at different values for my two MMA7361s, even though documentation indicates that all axes should be centered at Vcc/2 = 3.3/2 = 1.65:
 x:1.55 y:1.65 z:1.40
 x:1.65 y:1.75 z:1.45
Am I doing something wrong, or are the centered values just not calibrated right?
useful application note :: http://www.freescale.com/files/sensors/doc/app_note/AN3461.pdf
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