How to increase IMU sample rate on Arduino Nano 33 IoT?

ambrose_maker · October 29, 2019, 3:14am

Hello everyone,

In the library Arduino_LSM6DS3, the IMU sample rate is fixed at 104 Hz which is too low for my application. I need accelerometer sample rate greater than 2000Hz.

There is no functions to set the sample rates. So I try to modify the Arduino_LSM6DS3 library.

I modify value of below line in LSM6DS3.cpp
writeRegister(LSM6DS3_CTRL1_XL, 0x4A)
Tried from 0x1A to 0xAA, and expect to get sample rate from 12.5Hz to 6664Hz.

I can get the accelerometer sample rate correctly for 12.5Hz, 26Hz, 52Hz, 104Hz, 208Hz, 416Hz

But I cannot get a higher sample rate, the maximum sample rate is about 500Hz.

How can I change a sample greater than 416Hz?

I use the example from below link to read the accelerometer data.

github.com

arduino-libraries/Arduino_LSM6DS3/blob/master/examples/SimpleAccelerometer/SimpleAccelerometer.ino

/*
  Arduino LSM6DS3 - Simple Accelerometer

  This example reads the acceleration values from the LSM6DS3
  sensor and continuously prints them to the Serial Monitor
  or Serial Plotter.

  The circuit:
  - Arduino Uno WiFi Rev 2 or Arduino Nano 33 IoT

  created 10 Jul 2019
  by Riccardo Rizzo

  This example code is in the public domain.
*/

#include <Arduino_LSM6DS3.h>

void setup() {
  Serial.begin(9600);

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Thanks

Ambrose

ocrdu · October 30, 2019, 5:48pm

I haven't tried myself, but I noticed the library at:

is more elaborate and complete, so maybe you can use that, or at least "steal" some code:

SparkFun_LSM6DS3_Arduino_Library/SparkFunLSM6DS3.cpp at master · sparkfun/SparkFun_LSM6DS3_Arduino_Library · GitHub has the code to change settings at about line 400 .

system · May 7, 2021, 11:56am