Arduino, Wire, and I2C Part 4b: Noise reduction

Following the manufacturer's recommendations, I put a 1μF capacitor in the circuit to decouple power supply noise at V_S. This meant replacing the .1μF capacitor that sparkfun had put there. Not a particularly big deal, and well worth it as you can see in the attached graph.

The down side is that the vertical axis, whatever that happens to be, remains fairly noisy on the accelerometer and to a lesser extent, on the magnetometer, but clearly the non-vertical axes have had significant reductions of noise. For the purposes of comparison, I did offset the 1μF data set so that the two sets of data shared a common mean value. The 1-sigma error shading is computed solely from the .1μF data set, however.