mpu9250 not detected by RTIMULib2 but detected by I2C scanner

shome · February 27, 2019, 3:05pm

I tried to run the IMU calibration code at
https://github.com/richardstechnotes/RTIMULib-Arduino/tree/master/RTArduLinkIMU

The code compiles and is copied to the arduini but I get error on the serial monitor

RTArduLinkIMU starting using device MPU-9150
Failed to init IMU: -6
No valid compass calibration data

Identity: RTArduLink_Arduino
Port index 0 speed=5, hardware port number=0
⸮Ue⸮

I need to calibrate the IMU mpu9250 before I use it for the first time for which the RTArduLink code needs to run. How can I get the compass calibration data even before I calibrate it

I ran the IMUMagCal from the same git location and saved the results in the EEPROM. But I still get the same error Failed to init IMU: -6 when I try to run the RTIMULib-Arduino code.

To check whether the I2C device has been identified I used the I2C scanner code at Arduino Playground - I2cScanner

It returned
Scanning...
I2C device found at address 0x68 !
done

How do I get the IMU 9250 to be detected correctly by the RTIMULib-Arduino?

Also why is the IMU getting detected as 9150 when it is actually a 9250(I have checked the IC name using a lense)

Idahowalker · February 27, 2019, 3:36pm

I use the BolderFlight Systems Library for the MPU9250 and do not have those issues: GitHub - bolderflight/mpu9250: MPU-9250 sensor driver.

jremington · February 27, 2019, 3:50pm

Should work with RTIMUlib. You just need to DEFINE the correct IMU for compilation. See this post (using one of Pololu's IMUs).

shome · February 27, 2019, 5:00pm

@Idaholwalker: thanks for your multiple replies on both of my posts. I will try the bolder code tomorrow.

@jremington: thanks for your reply. I tried polulus suggestion to change the IMU defs.

after editing RTIMULibdefs.h by commenting and uncommenting related parts

//#define MPU9150_68 // MPU9150 at address 0x68

#define MPU9250_68 // MPU9250 at address 0x68

Then I run the arduinomagcal code and then I run the RTArduLinkIMU.

The IMU number changes to 9250 but I get new erros

RTArduLinkIMU starting using device MPU-9250
Failed to init IMU: -6
Using compass calibration

Identity: RTArduLink_Arduino
Port index 0 speed=5, hardware port number=0
⸮Ue⸮

jremington · February 27, 2019, 5:18pm

Do you know if your IMU is actually working properly?

There are some pretty simple programs around that initialize it and start reading out data.

shome · February 28, 2019, 1:27am

I ran the i2c scanner which detected that there was a device on the bus at 0x68
Any suggestion of such program which could detect if the IMU is working fine?

jremington · February 28, 2019, 1:39am

Google "arduino mpu9250" for a large number of leads.

shome · February 28, 2019, 2:10am

shome · February 28, 2019, 5:30am

The results of the libraries i tried:

=========================

github.com

orgua/iLib/blob/master/examples/i2c_MPU9250/i2c_MPU9250.ino

#include <Wire.h>
#include "i2c.h"

// IMU-Sensor
#include "i2c_MPU9250.h"
MPU9250 mpu9250;

void setup()
{
    Serial.begin(115200);

    Serial.print("Probe MPU9250: ");
    switch (mpu9250.initialize())
    {
        case 0: Serial.println("MPU-Sensor missing"); while(1) {};
        case 1: Serial.println("Found unknown Sensor."); break;
        case 2: Serial.println("MPU6500 found."); break;
        case 3: Serial.println("MPU9250 found!"); break;
    }

This file has been truncated. show original

04Probe MPU9250: MPU-Sensor missing

=========================

⸮
MPU9250 WHO AM I = 73
Could not connect to MPU9250: 0x0

=========================

my connection:
9250 breakout->arduino uno
Vdd ->3.3V
Gnd->Gnd
SDA->A4
SCL->A5

system · May 6, 2021, 10:24am