Body motion Detection using LIS2DH/LIS3DH

shady · ‎2015-09-08

Posted on September 08, 2015 at 14:18

Dear All,

I am writing a firmware that is supposed to detect if a body is moved for a certain time i.e. 3 seconds of continuous motion. I am using LIS3DH Accelerometer sensor. Here is the configuration registers values:

CTRL_REG1 = 0x2F //Enable all axes + ODR = 10 Hz

CTRL_REG2 = 0x00 //Default

CTRL_REG3 = 0x40 //Enable AO1 interrupt on INT1

CTRL_REG4 = 0xB0 //16G full scale

CTRL_REG5 = 0x00 //Default

CTRL_REG6 = 0x00 //Default

INT1_CFG = 0x7F //6D movement recognetion

INT1_THS = 0x02 //Note FS = 16G. (Sensitivity = 0.25G)

INT1_DURATION = 0x1E //0x1E = 30. Note ODR = 10 Hz. (Threshold = 3 Sec)

What I got is that if the body is moved for time

less than

3 seconds, the Accelerometer consider it as an event and interrupt the Micro-controller after 3 seconds. I think by this configurations it has to neglect such motions (which period is less than 3 seconds).

Any one can help me in detecting only motions which period is greater than 3 seconds?

Thanks in advance

#accelerometer #mems-accelerometer

shady · ‎2015-10-21

Posted on October 21, 2015 at 15:05

Please anyone is here ???

Winfred LU · ‎2015-10-26

Posted on October 26, 2015 at 09:13

I think you mis-understood the 6D movement detection.

Instead of body movement, it is actually 6 direction function which tells you the orientation of the device.