Blog - All Comments

RE: ACE - Blog #8 - Offloading computation to LSM6DS3

TobiasR — Sun, 03 Sep 2023 12:21:33 GMT

Thanks for the nice blog post.

I'm trying to detect free falls with my XIAO nRF52840 which has the LSM6DS3 included.

However, I can't make it work to receive an interrupt for this. (Double) Taps work fine but the free-fall detection never interrupts anything.

Even the sample code from the libraries doesn't result anything (it compiles, just does not trigger).

I even asked in forums like here

https://forum.arduino.cc/t/lsm6ds3-free-fall-detection-not-working/1163290/7

and

https://forum.seeedstudio.com/t/xiao-nrf52840-free-fall-detection-not-working/272103

but you seem to be the "reference to go":

My current code looks like that, just in case you see anything I messed up or forgot.

Thanks for any help!

---

#include "LSM6DS3.h"

#include "Wire.h"

LSM6DS3 myIMU(I2C_MODE, 0x6A);

#define int1Pin PIN_LSM6DS3TR_C_INT1

volatile uint8_t interruptCount = 0; // Amount of received interrupts

uint8_t prevInterruptCount = 0; // Interrupt Counter from last loop

void setup() {

Serial.begin(9600);

while (!Serial) {

; // wait for serial port to connect. Needed for native USB port only

}

Serial.println("--- START ---");

pinMode(LED_RED, OUTPUT);

pinMode(LED_GREEN, OUTPUT);

pinMode(LED_BLUE, OUTPUT);

setLedRGB(false, false, true); // set blue led

myIMU.settings.accelEnabled = 1;

myIMU.settings.tempEnabled = 1;

myIMU.settings.gyroEnabled = 1; // Gyro currently not used, disabled to save power

if (myIMU.begin() != 0) {

Serial.println("IMU error");

} else {

Serial.println("IMU OK!");

}

setupFreeFallInterrupt();

pinMode(int1Pin, INPUT);

attachInterrupt(digitalPinToInterrupt(int1Pin), int1ISR, RISING);

}

void loop() {

setLedRGB(false, false, true); // reset led to blue only

Serial.print("\Iterrupt Counter: ");

Serial.println(interruptCount);

// if interrupt was received in this cycle

if (interruptCount > prevInterruptCount) {

Serial.println("\Interrupt received!");

setLedRGB(false, true, false); // set green only

}

prevInterruptCount = interruptCount;

if (interruptCount >= 5) {

// Trigger System OFF after 5 interrupts

goToPowerOff();

}

myIMU.writeRegister(LSM6DS3_ACC_GYRO_TAP_CFG1, 0x01); // LATCHED

delay(500);

}

// -------------------- System ------------------------- //

void goToPowerOff() {

setLedRGB(false, false, false);

Serial.println("Going to System OFF");

setupFreeFallInterrupt(); // not needed here, if already applied..

delay(100); // delay seems important to apply settings, before going to System OFF

//Ensure interrupt pin from IMU is set to wake up device

nrf_gpio_cfg_sense_input(digitalPinToInterrupt(int1Pin), NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);

// Trigger System OFF

NRF_POWER->SYSTEMOFF = 1;

}

// -------------------- Interrupts ------------------------- //

void setupFreeFallInterrupt() {

uint8_t error = 0;

uint8_t dataToWrite = 0;

dataToWrite |= LSM6DS3_ACC_GYRO_BW_XL_100Hz; // 0000 0001 200Hz

dataToWrite |= LSM6DS3_ACC_GYRO_FS_XL_4g; // 0000 0000 2g

dataToWrite |= LSM6DS3_ACC_GYRO_ODR_XL_104Hz;// 0100 0000 104Hz

error += myIMU.writeRegister(LSM6DS3_ACC_GYRO_CTRL1_XL, dataToWrite);

error += myIMU.writeRegister(LSM6DS3_ACC_GYRO_WAKE_UP_SRC, 0b00100000);

error += myIMU.writeRegister(LSM6DS3_ACC_GYRO_TAP_CFG1, 0b00000001);

error += myIMU.writeRegister(LSM6DS3_ACC_GYRO_WAKE_UP_DUR, 0b00000000);

error += myIMU.writeRegister(LSM6DS3_ACC_GYRO_FREE_FALL, 0b000110);

if (error) {

Serial.println("Problem configuring the device.");

} else {

Serial.println("Device O.K.");

}

void int1ISR()

{

interruptCount++;

}

// -------------------- Utilities ------------------------- //

void setLedRGB(bool red, bool green, bool blue) {

if (!blue) { digitalWrite(LED_BLUE, HIGH); } else { digitalWrite(LED_BLUE, LOW); }

if (!green) { digitalWrite(LED_GREEN, HIGH); } else { digitalWrite(LED_GREEN, LOW); }

if (!red) { digitalWrite(LED_RED, HIGH); } else { digitalWrite(LED_RED, LOW); }

}

RE: Building an Android app for the Garden controller

sebulox — Mon, 06 Feb 2023 20:35:46 GMT

Very interesing project. how does the garden bluetooth device that you are controlling with android look like? Using arduino or something like that? Would be pleased to get more details.

RE: Trakcore #4 AI Assisted Posture Modification - Enabling IMU and BLE with Edge Impulse ML on Arduino Nano 33 IoT

Francesca98 — Wed, 14 Sep 2022 17:32:16 GMT

Hi! In part #4, in particular in the "publishing data over BLE" part, the code is missing the declaration of the variables "oldposture" and "update posture". We're having problems introducing them, we were wondering if you could help us. By the way you're job is amazing, congrats!

RE: Remote Agriculture Solution #02: Components and Design Structure

mario1015 — Wed, 20 Jul 2022 16:31:58 GMT

Great Project @aarian2134[emoticon:1435ff2429184e17bc948e4f19178e1e]

RE: VACBAG---"Final Prototype"__________Blog#8

sidastro — Wed, 06 Oct 2021 07:57:17 GMT

Pls, refer linked blogs for now

I'll update this blog as time permits [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-4b308a26-2b46-4f1e-a140-dc465fa58ec0/contentimage_5F00_734.png:16:16]

RE: Vital Care - 07 Final Summary

neilk — Fri, 27 Aug 2021 13:17:23 GMT

An excellent project. Well described and executed.

Thanks for sharing.

Neil

RE: Vital Care - 05 Respiration

neilk — Fri, 27 Aug 2021 13:14:03 GMT

Very impressive analysis. Thanks for sharing.

Neil

RE: Vital Care - 04 ECG [AD8232 single LEAD]

bridges_patrick_donald — Fri, 13 Aug 2021 11:13:11 GMT

dog

RE: Vital Care - 04 ECG [AD8232 single LEAD]

embeddedguy — Tue, 10 Aug 2021 12:56:06 GMT

Very detailed stuff but I have a question.

So What was your final choice for the sensor? Selfmade with Instru. Amplifier or AD8232?

Cost wise is it cheap to make own sensor? Also, is it reliable?

Thanks,

Ujjval.

RE: Vital Care - 07 Final Summary

embeddedguy — Thu, 29 Jul 2021 05:21:20 GMT

Indeed a great project.

RE: Vital Care - 04 ECG [AD8232 single LEAD]

neilk — Mon, 28 Jun 2021 15:02:49 GMT

Most impressive analysis!

I started my career in Medical Electronics and Physics, but that was many many years ago. I wish we'd had this sort of technology then!

Neil

RE: Open Source EMDR Machine #11. An update on Software Application

cjodrey — Mon, 21 Jun 2021 22:29:47 GMT

Hey, that's really cool. I hear this kind of software costs a lot of money! It's great that you're providing this for free. [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-306e85e9-a1df-40d4-bfa3-8a407bb94e2b/contentimage_5F00_1.png:16:16]

RE: Open Source EMDR Machine #10. Update on tappers functionality

wilson317 — Thu, 10 Jun 2021 20:04:48 GMT

Hi. Absolutely love this. I am an EMDR therapist and this is great. How do I complie the android app, as that would help me a lot...You are a star

RE: Vital Care - 07 Final Summary

DAB — Sat, 05 Jun 2021 17:59:23 GMT

Nice update.

DAB

RE: Temperature sensing for the Garden controller

skruglewicz — Thu, 03 Jun 2021 19:37:46 GMT

Hi your attention to detail is very helpful. Appreciate all your videos.Steve K