9DOF IMU board doesn't work

I’m trying to use a 9DOF IMU I purchased from eBay.
Similar to the one here: Introduction | Adafruit 9-DOF IMU Breakout | Adafruit Learning System

I connected the sensor to the arduino as described on their website and tried to use the checking code they posted (added below).
I keep getting an error message that I have to check the wires because the sensor isn’t found.
Has anyone here had any experience with connecting IMU’s and arduinos? would love some help :slight_smile:
Thank you!

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_LSM303_U.h>
#include <Adafruit_L3GD20_U.h>
#include <Adafruit_9DOF.h>

/* Assign a unique ID to the sensors */
Adafruit_9DOF                dof   = Adafruit_9DOF();
Adafruit_LSM303_Accel_Unified accel = Adafruit_LSM303_Accel_Unified(30301);
Adafruit_LSM303_Mag_Unified   mag   = Adafruit_LSM303_Mag_Unified(30302);

/* Update this with the correct SLP for accurate altitude measurements */
float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;

/**************************************************************************/
/*!
    @brief  Initialises all the sensors used by this example
*/
/**************************************************************************/
void initSensors()
{
  if(!accel.begin())
  {
    /* There was a problem detecting the LSM303 ... check your connections */
    Serial.println(F("Ooops, no LSM303 detected ... Check your wiring!"));
    while(1);
  }
  if(!mag.begin())
  {
    /* There was a problem detecting the LSM303 ... check your connections */
    Serial.println("Ooops, no LSM303 detected ... Check your wiring!");
    while(1);
  }
}

/**************************************************************************/
/*!
*/
/**************************************************************************/
void setup(void)
{
  Serial.begin(9600);
  Serial.println(F("Adafruit 9 DOF Pitch/Roll/Heading Example")); Serial.println("");
  
  /* Initialise the sensors */
  initSensors();
}

/**************************************************************************/
/*!
    @brief  Constantly check the roll/pitch/heading/altitude/temperature
*/
/**************************************************************************/
void loop(void)
{
  
  sensors_event_t accel_event;
  sensors_event_t mag_event;
  sensors_vec_t   orientation;

  /* Calculate pitch and roll from the raw accelerometer data */
  accel.getEvent(&accel_event);
  if (dof.accelGetOrientation(&accel_event, &orientation))
  {
    /* 'orientation' should have valid .roll and .pitch fields */
    Serial.print(F("Roll: "));
    Serial.print(orientation.roll);
    Serial.print(F("; "));
    Serial.print(F("Pitch: "));
    Serial.print(orientation.pitch);
    Serial.print(F("; "));
    
  }
  
  /* Calculate the heading using the magnetometer */
  mag.getEvent(&mag_event);
  if (dof.magGetOrientation(SENSOR_AXIS_Z, &mag_event, &orientation))
  {
    /* 'orientation' should have valid .heading data now */
    Serial.print(F("Heading: "));
    Serial.print(orientation.heading);
    Serial.print(F("; "));
  }

  Serial.println(F(""));
  delay(0);
}

Then double check your wiring, plus use a multimeter to check power is definitely getting to the IMU,
and there is continuity for every signal.

Assume nothing until you've proved its correct, proceed methodically.