LIS2DU12TR accelerometer

[LogosLEE]

Hi. 

I used LIS2DU12TR accelerometer IC on the PCB. 

It's angle value  was changing every sec. but my smart phone app indicated current angle is 0.0 degree. 

current angle is -0.515648
[proc_bt_read_all] TX data (len=15)
00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00
current angle is -0.865430
[proc_bt_read_all] TX data (len=15)
00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00
current angle is -0.460660
[proc_bt_read_all] TX data (len=15)
00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00
current angle is -0.688205
[proc_bt_read_all] TX data (len=15)
00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00
---------------------------------

How can I set  ODR and FS variables , more accuracy and more stable  this IC ,  

LIS2DU12StatusTypeDef LIS2DU12_Begin()

{

/* Disable I3C */

if (lis2du12_bus_mode_set(&reg_ctx, LIS2DU12_I3C_DISABLE) != LIS2DU12_OK) {

return LIS2DU12_ERROR;

}

/* Enable register address automatically incremented during a multiple byte

access with a serial interface. Enable BDU. */

if (lis2du12_init_set(&reg_ctx, LIS2DU12_DRV_RDY) != LIS2DU12_OK) {

return LIS2DU12_ERROR;

}

/* FIFO mode selection */

lis2du12_fifo_md_t fifo_mode = {

.operation = LIS2DU12_BYPASS,

.store = LIS2DU12_16_BIT,

.watermark = 0,

};

if (lis2du12_fifo_mode_set(&reg_ctx, &fifo_mode) != LIS2DU12_OK) {

return LIS2DU12_ERROR;

}

/* Select default output data rate. */

X_odr = 400.0f;

/* Select default ultra low power (disabled). */

X_ultra_low_power = LIS2DU12_ULTRA_LOW_POWER_DISABLE;

/* Output data rate: power down, full scale: 2g */

lis2du12_md_t mode = {

.odr = LIS2DU12_OFF,

.fs = LIS2DU12_2g,

};

if (lis2du12_mode_set(&reg_ctx, &mode) != LIS2DU12_OK) {

return LIS2DU12_ERROR;

}

initialized = 1L;

return LIS2DU12_OK;

}

[Federica Bossi]

Hi @LogosLEE ,

Welcome to ST Community!

Just to understand better your issue, which is your application? why are you trying to measure an angle with the accelerometer?

[LogosLEE]

Hi.  Federica . 

My  application is Solar Tracker , and i want to get  exact angle value, but angle values are changing from -1  to 1 degree.  i want to set  0.5 degree   accuracy. 

so,  i thought my FW setting was wrong.  

How can I set  ODR and FS variables , more accuracy and more stable  this IC ,?

00 00 02 00 00 00 00 00 00 7D 00 64 37 01 00
current angle is -2.193487
[proc_bt_read_all] TX data (len=15)
00 00 02 00 00 00 00 00 00 7D 00 64 37 01 00
current angle is -2.295314
[proc_bt_read_all] TX data (len=15)
00 00 02 00 00 00 00 00 00 7D 00 64 37 01 00
current angle is -2.535645
[proc_bt_read_all] TX data (len=15)
00 00 02 00 00 00 00 00 00 7D 00 64 37 01 00

[Federica Bossi]

Hi @LogosLEE ,

Have a look at AN5648 or DT0058.

Let me know if this helps 🙂

[Federica Bossi]

Hi @LogosLEE ,

Have the Application note and design tip helped you?