In the Smart Sensors And Applications PDF pages 230-240 ( http://www.parallax.com/Portals/0/Do...nsors-v1.0.pdf ) the memsic 2125 provides pulse width data in the range of 1875 to 3150 whereby these values are scaled and offset to a range of -100 TO +100. This data is then considered to be the Acceleration data for a moving RC car whereby these -100 TO +100 figures are copied to the provided spreadsheet and used as the basis for further calculations, ie., velocity.
I don’t understand how simply offsetting and scaling the memsic range data (provided by the BS2 PULSIN command) automatically makes these figures Acceleration figures when other documentation such as “Memsic 2125 Accelerometer Demo Kit (#28017) ( http://www.parallax.com/Portals/0/Do.../memsickit.pdf ) indicates that the raw memsic data must be converted to acceleration by use of the equation A(g) = ((T1 / T2) – 0.5 ) /12.5% ( where T1 is the sense pulse width, T2 is the total pulse duration).
I have spent many hours pondering this one without success. Any help is greatly appreciated!