Code for ESP32 control of LSM9DS0 through relay shield with IoT

talemtech · January 20, 2020, 8:56pm

Please direct me towards code for using the ESP32 IoT to connect LSM9DS0 units through my relay controller shields. I have tried a number of approaches and have not been successful.

TravisE_NCD_Technica · January 21, 2020, 3:07pm

We have Arduino sample code for the LSM9DS0 here:

github.com

ControlEverythingCommunity/LSM9DS0/blob/master/Arduino/LSM9DS0.ino

// Distributed with a free-will license.
// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
// LSM9DSO
// This code is designed to work with the LSM9DS0_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/content/Accelorometer?sku=LSM9DS0_I2CS#tabs-0-product_tabset-2

#include<Wire.h>

// LSM9DSO Gyro I2C address is 6A(106)
#define Addr_Gyro 0x6A
// LSM9DSO Accl I2C address is 1E(30)
#define Addr_Accl 0x1E

void setup() 
{
  // Initialise I2C communication as MASTER
  Wire.begin();
  // Initialise Serial Communication, set baud rate = 9600
  Serial.begin(9600);

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talemtech · January 21, 2020, 5:53pm

I cut and pasted the sample code into the arduino ide, set the board to the adafruit feather, which has worked for our relay controller app, and uploaded the code to the esp32 module on the relay board. I then plugged the relay board into a proper power supply, attached the LSM9DS0 using the provided cable and …nada. I get the printout of the X,Y, and Z axis of rotation, acceleration, and Magnetic field but they are all zeroed out.

TravisE_NCD_Technica · January 21, 2020, 7:32pm

Try this I2C scan code and monitor the Serial output of the ESP32 module. It should output the address’s of the I2C devices connected:

github.com

telliottosceola/ESP32_I2C_Scan/blob/master/main.cpp

#include <Wire.h>
#include <Arduino.h>
unsigned long scanInterval = 10000;
unsigned long lastScan = 0;
void scan();

void setup() {
    //Set the speed of the I2C port on the Photon and start it.
    Serial.begin(115200);
    delay(2000);
    Serial.println("About to call Wire.begin");
    Wire.begin();
    Serial.println("Wire library initiated");
    scan();
}

void loop() {
    if(millis() > lastScan + scanInterval){
      scan();
    }

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talemtech · January 21, 2020, 8:10pm

It came back with 3 devices: 28 32 106

TravisE_NCD_Technica · January 21, 2020, 9:14pm

32 would be the relay board. 106 is going to be the Gyro in the LSM9DS0 and I’d bet 28 is the Accelorometer in the LSM9DS0 but it looks like the sample code is set for 30 rather than 28. you might try changing that Addr_Accl variable from 0x1E to 0x1C and see if that works.

talemtech · January 21, 2020, 9:33pm

I realize that the 32 relates to the relay board so I changed the address for the Accl to 1C. This didn’t work well so I flipped the addresses around so that Gyro was 1C and Accl was 6A. This generated data. I am still not seeing Magnetic field data but there is acceleration and rotation.

TravisE_NCD_Technica · January 21, 2020, 10:37pm

Hi,

That code was contributed so I cannot speak for it’s validity. I’d say its really just more of a starting point. You might take a look at the data sheet for the LSM9DS0 to get a better understanding of it’s interaction over the I2C bus.