Arduino Uno I2C data reading problem

Other Hardware Sensors
1

Dear all,

I want to output the respective x, y, z-axis acceleration and gyroscope values of IMU (LSM6DSLTR) through I2C communication with arduino uno.
datasheet(https://www.mouser.kr/datasheet/2/389/lsm6dsl-1509291.pdf)

However, as you can see in the picture, all data values are outputted -1 at a constant period of time.
Arduino's current I2C communication speed is 100k Hz, which is standard mode.
I don't know why.

Thank you.

I2C
I2C442×566 6.07 KB

#include <Wire.h>
const int LSM6DSL_ADDR = 0x6A;

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

  Wire.beginTransmission(LSM6DSL_ADDR);
  Wire.write(0x10); // CTRL1_XL register
  Wire.write(0x50); // 208 Hz, +/-2g, BW =100Hz
  Wire.endTransmission();
  
  Wire.beginTransmission(LSM6DSL_ADDR);
  Wire.write(0x11); // CTRL2_G regi = 0.96;
  Wire.write(0x50); //   208 Hz, 250dps
  Wire.endTransmission();
}

void loop() {
  
  Wire.beginTransmission(LSM6DSL_ADDR); // Read accelerometer and gyroscope values from LSM6DSL
  Wire.write(0x22); // Read from OUTX_L_G (gyro) register
  Wire.endTransmission();
  Wire.requestFrom(LSM6DSL_ADDR, 6, true); //One master > "True" auto
  int16_t gyro_x = Wire.read() | (Wire.read() << 8); //0x29 HIGH bit & 0x28 LOW bit
  int16_t gyro_y = Wire.read() | (Wire.read() << 8); //0x2B HIGH bit & 0x2A LOW bit
  int16_t gyro_z = Wire.read() | (Wire.read() << 8); //0x2D HIGH bit & 0x2C LOW bit
  
  Wire.beginTransmission(LSM6DSL_ADDR);
  Wire.write(0x28); // Read from OUTX_L_XL (accel) register
  Wire.endTransmission();
  Wire.requestFrom(LSM6DSL_ADDR, 6, true);
  int16_t acc_x = Wire.read() | (Wire.read() << 8);
  int16_t acc_y = Wire.read() | (Wire.read() << 8);
  int16_t acc_z = Wire.read() | (Wire.read() << 8);

  Serial.print(gyro_x);
  Serial.print("  ");
  Serial.print(gyro_y);
  Serial.print("  ");
  Serial.print(gyro_z);
  Serial.print("  ");
  Serial.print(acc_x);
  Serial.print("  ");
  Serial.print(acc_y);
  Serial.print("  ");
  Serial.println(acc_z);
}
2

I strongly recommend that you start with one of the examples from a well tested library for that sensor.

The more advanced sensors tend to require initialization steps that you might have overlooked, and the -1 lines suggest that you are trying to read out data faster than the selected data rate, or the sensor is otherwise not ready.

Hint: set the serial Baud rate to at least 115200, so you don't waste so much time printing (one millisecond per character, at 9600 Baud).

With a new sensor, I usually start with the Sparkfun libraries, as the Adafruit libraries require loading lots of other sensor libraries (including their "Unified Sensor Framework") in order to do the simplest task.

3

That is typical for a slave that can not provide the requested data.
Check the result of the Wire.endTransmission() and Wire.requestFrom().

Have you run a I2C sniffer to check the physical connection of the sensor?