topic Setting MMA7660 for meassuring Acceleration in 8-bit Microcontrollers

Setting MMA7660 for meassuring Acceleration

sidel — Tue, 05 Apr 2011 19:56:23 GMT

Hello,

I am using the MMA7660 Accelerometer.

I have tried the following register initialization for "NO interupts, active mode, 8 samples per second"

INTSU = 0x00; // Interrupt Setup Register

MODE = 0x01; // MODE" Register

SR = 0x94; //Sample Rate Register

PDET = 0x00; //Tap/Pulse Detection Register

PD = 0x00; // "PD" Tap/Pulse Debounce Count Register

I am reading out the orientation angles from the chip,

Can someone plz tell what should I change in order to read acceleration measurments instead of orientation?

I have red the datasheet thoroughly but I cannot find anything about switching between orientation and acceleration readout modes.

Kind Regards,

George

Re: Setting MMA7660 for meassuring Acceleration

Jake74 — Fri, 03 Jun 2011 06:21:29 GMT

The acceleration is read in the X,Y,and Z registers (registers 0,1,and 2). Gravity is of course 1G.

Re: Setting MMA7660 for meassuring Acceleration

sidel — Fri, 03 Jun 2011 13:45:51 GMT

Thanks for your Reply Jake,

From what I have understood, the chip outputs either orientation angles or acceleration values. Both measurements are updated on X,Y,Z registers (see page 28) but somehow the mode is selected .

Untill now I can get only orientation angles on X,Y,Z registers can anyone advise how can I switch to acceleration readout?