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Accuracy/Precision and Resolution are two extremely relevant parameters when doing a measurement and, consequently, to achieve a complete and objective understanding during the analysis of the measured values.
Resolution - "...smallest change (of the physical unit) that can be measured..."
Accuracy - defines "... how close a reported measurement is to the true value being measured..."
Definitions taken from ☍
Relatively to the resolution of Accelerometer (ACC) sensor, taking into consideration that the range of values collected by ACC sensor are between -3 g and +3 g:
For a 8-bit acquisition the achievable resolution will be approximately:
In terms of accuracy a brief test can be executed in order to estimate this parameter but a small note should be taken into consideration, because the transfer function of accelerometer sensor requires two constants resulting from a calibration procedure, which you should follow to achieve the maximum accuracy (as described here ☍).
For determining the accuracy we need a known reference value.
In our case, this reference value was the gravitational acceleration, so we conducted a set of 10 seconds acquisitions collecting gravitational acceleration from the 3-axes of ACC sensor.
The average difference between the real (1 g) and the acquired sample values are:
* (ACC X - 16 bits)
* (ACC Y - 16 bits)
* (ACC Z - 16 bits)
We can always replicate the same logic to other sensors, with slightly adjustments !