How to use +/- 16g on Arduino Nano 33 BLE LSM9DS1

nv7 · December 5, 2023, 7:15am

I have an Arduino Nano 33 BLE and I want to use the built in LSM9DS1 IMU at +/- 16g mode. While the sensor supports this, the provided library (Arduino_LSM9DS1) does not as far as I can tell.

I tried using Adafruit LSM9DS1 but it doesn't support using internal pins, so that won't work since this is not connected to the external I2C bus but rather some internal pins in the schematic.

Is there a way to use it in +/- 16 g mode? A library? A way to use the original library but configure it differently?

DaveX · December 14, 2023, 6:46pm

Maybe you could change the 'private:'s in your installation's copy of LSM9DS1.h to public: and access the registers directly within the library:

github.com

arduino-libraries/Arduino_LSM9DS1/blob/d6bdcb7ac4720563ef0549aa7c4b878d0d795d33/src/LSM9DS1.h#L51


      
              // Gyroscope
              virtual int readGyroscope(float& x, float& y, float& z); // Results are in degrees/second.
              virtual int gyroscopeAvailable(); // Number of samples in the FIFO.
              virtual float gyroscopeSampleRate(); // Sampling rate of the sensor.
          
              // Magnetometer
              virtual int readMagneticField(float& x, float& y, float& z); // Results are in uT (micro Tesla).
              virtual int magneticFieldAvailable(); // Number of samples in the FIFO.
              virtual float magneticFieldSampleRate(); // Sampling rate of the sensor.
          
            private:
              bool continuousMode;
              int readRegister(uint8_t slaveAddress, uint8_t address);
              int readRegisters(uint8_t slaveAddress, uint8_t address, uint8_t* data, size_t length);
              int writeRegister(uint8_t slaveAddress, uint8_t address, uint8_t value);
          
            private:
              TwoWire* _wire;
          };
          
          extern LSM9DS1Class IMU_LSM9DS1;

But you might also need the defines in the .cpp file.

github.com

arduino-libraries/Arduino_LSM9DS1/blob/d6bdcb7ac4720563ef0549aa7c4b878d0d795d33/src/LSM9DS1.cpp#L22-L39


      
          #define LSM9DS1_ADDRESS            0x6b
          
          #define LSM9DS1_WHO_AM_I           0x0f
          #define LSM9DS1_CTRL_REG1_G        0x10
          #define LSM9DS1_STATUS_REG         0x17
          #define LSM9DS1_OUT_X_G            0x18
          #define LSM9DS1_CTRL_REG6_XL       0x20
          #define LSM9DS1_CTRL_REG8          0x22
          #define LSM9DS1_OUT_X_XL           0x28
          
          // magnetometer
          #define LSM9DS1_ADDRESS_M          0x1e
          
          #define LSM9DS1_CTRL_REG1_M        0x20
          #define LSM9DS1_CTRL_REG2_M        0x21
          #define LSM9DS1_CTRL_REG3_M        0x22
          #define LSM9DS1_STATUS_REG_M       0x27
          #define LSM9DS1_OUT_X_L_M          0x28

The internal pins are SDA1 and SCA1, so you should be able to access it directly on Wire1.*

This bit of the Ardafruit library might let you use Wire1:

github.com

adafruit/Adafruit_LSM9DS1/blob/585bd5536e8cbfb0c0cd9293cc6d55da73bf249f/Adafruit_LSM9DS1.cpp#L28-L31


      
          Adafruit_LSM9DS1::Adafruit_LSM9DS1(TwoWire *wireBus, int32_t sensorID) {
            _wire = wireBus;
            initSensor(sensorID);
          }

system · June 11, 2024, 6:47pm

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How to use +/- 16g on Arduino Nano 33 BLE LSM9DS1

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