Accelerometer Sensor Testing

                We tested the ADXL335 accelerometer by first rotating it so that each axis would receive a value of 1g, 0g, and -1g for a given time. We then observed the analog read data saved on the data logger to see what values each axis was giving off, based on the g value they were receiving. Below are the analog read values we found for each g value, for each axis.

	x Val	y Val	z Val
0g	339	339	347
+1g	406	402	412
-1g	270	265	279

                From here we then created three linear calibration equations to place into our code so we would receive g values instead of arbitrary analog read ones. The three equations are below.

               

              As you can see, the three linear equations will convert our analog data into multiples of g, which ensures that the data we collect will be accurate and usable for analysis.