Wrong ID message with "SparkFun 9DoF IMU Breakout - ICM-20948 (Qwiic)" and "Arduino Uno Mini"

[vgarciavazquez]

Hello Sparkfun ICM-20948 team

I am trying to obtain data from SparkFun 9DoF IMU Breakout - ICM-20948 (Qwiic) using Arduino Uno Mini and SPI, but I obtain the message Wrong ID.

My settings are as follows:

• Arduino IDE version 1.8.19 with Arduino AVR Boards 1.8.5 and Sparkfun 9DoF IMU Breakout - ICM 20948 Arduino library version 1.2.9
• Board selected in Arduino IDE: Arduino Uno Mini
• Upload the program Example1_Basics.ino to Arduino Uno Mini after uncommenting #define USE_SPI and replacing #define CS_PIN 2 to #define CS_PIN 10
• The connections between Arduino Uno Mini and Sparkfun 9DoF IMU Breakout as follows:

ARDUINO UNO Mini ------ SparkFun 9DoF IMU Breakout - ICM-20948
D10 (SS) ------ SPI – CS
D12 (CIPO) ------ SPI – MISO
D13 (SCK) ------ SPI – SCLK
D11 (COPI) ------ SPI – MOSI
3V3 ------ SPI – 1V8-5V5
GND ------ SPI – GND

The expected behaviour would be to obtain the IMU data but what I obtain is in the Arduino IDE Serial Monitor Tool:

Initialization of the sensor returned: Wrong ID
Trying again...
Initialization of the sensor returned: Wrong ID
Trying again.�⸮⸮'K⸮⸮⸮⸮⸮⸮�⸮⸮'K⸮⸮⸮΁⸮⸮⸮S1Нh⸮ ⸮⸮hp⸮⸮⸮⸮⸮&�

If I uncomment myICM.enableDebugging();, the output in the Arduino IDE Serial Monitor Tool:

ICM_20948::checkID: ICM_20948_check_id returned: Wrong ID
ICM_20948::startupDefault: checkID returned: Wrong ID
ICM_20948_SPI:⸮⸮⸮8⸮⸮⸮h⸮2⸮⸮⸮⸮d�⸮⸮Y⸮~]@⸮�?Æ��⸮⸮<K0⸮⸮⸮V?Þ6⸮��

I have read the issue: #24 but no idea what I am doing wrong.

Why I receive a wrong ID?
How can I test that “SparkFun 9DoF IMU Breakout - ICM-20948 (Qwiic)” is working fine and is not damaged?

Thank you so much!

[PaulZC]

Hello @vgarciavazquez ,

The Arduino UNO Mini is a 5V board. It has 5V I/O pins. The ICM20948 is a 3.3V board. You are trying to interface 3.3V SPI signals to 5V pins. That will cause all kinds of problems.

You need a 4-channel level shifter to make this work.

https://www.sparkfun.com/products/19626

https://www.sparkfun.com/products/12009

Best wishes,
Paul

[PaulZC]

Ah. Sorry. My mistake. The ICM20948 breakout has level-shifters on-board. The 20948 is actually a 1.8V device.

Please try connecting the ICM20948 VIN pin to 5V - not 3.3V. It should work?

Best wishes,
Paul

[vgarciavazquez]

Thank you so much, Paul, for your suggestion.

I have connected Vin to Arduino Mini 5V and I have the same message: Wrong ID :-(

[PaulZC]

Hmmm…. It should work OK…. But I do not have a 20948 board with me to test. I need to think about this. Watch this space!

Best wishes,
Paul

[PaulZC]

Please check the ADR jumper:

“When open (default) the address of the ICM is 0x69 and it is possible to use SPI communication. When soldered closed the address changes to 0x68. Closing the jumper prevents you from using SPI.“

Check the “jumpers” section in the hook-up guide:

https://learn.sparkfun.com/tutorials/sparkfun-9dof-imu-icm-20948-breakout-hookup-guide

[PaulZC]

Or try:

#define CS_PIN SS

[vgarciavazquez]

Thanks a lot for your suggestions Paul.

I have checked the ADR jumper and it is open so it would be possible to use SPI communication.

I have also replaced #define CS_PIN 10 with #define CS_PIN SS but I have the same error :-(.

Why do I have the Wrong ID message? How can I check that the SparkFun 9DoF IMU Breakout - ICM-20948 is not damaged?

[PaulZC]

Hi @vgarciavazquez ,

The “wrong ID” message indicates a communication error. The code is not reading the correct identifier number from the chip. This happens when the SPI connections or pin definitions are not correct.

Please check the CIPO and COPI connections. Perhaps you have them swapped?

You are the first person I have talked to who is using the Arduino Mini. Perhaps there is something different with its configuration? I will test it - on Saturday. I do not have hardware with me at the moment.

We do not have any stock of the ICM-20948. It is not available at the moment. If it is a hardware fault, we can only offer you a refund, not a replacement. Sorry!

Best wishes,
Paul

[vgarciavazquez]

Paul, I have also swapped CIPO and COPI connections and the same message... I have rechecked all connections and I have as follows.

ARDUINO UNO Mini ------ SparkFun 9DoF IMU Breakout - ICM-20948
D10 (SS) ------ SPI – CS
D12 (CIPO) ------ SPI – MISO
D13 (SCK) ------ SPI – SCLK
D11 (COPI) ------ SPI – MOSI
5V ------ SPI – 1V8-5V5
GND ------ SPI – GND

The only thing that I can see is that SparkFun 9DoF IMU Breakout is power on (LED ON).

Thanks a lot for testing this Saturday.

Regarding a hardware fault, I bought SparkFun Qwiic SHIM Kit for Raspberry Pi (https://www.sparkfun.com/products/16987) that includes a 9DoF IMU Breakout - ICM-20948. This kit is available. Could I have a replacement of the whole kit just in case it is a hardware fault?

All the best

[PaulZC]

Can you test the ICM20948 with the Qwiic Shim? It uses the I2C interface instead of SPI, but will prove if the chip is functioning. Please try it if you can.

[vgarciavazquez]

Thanks Paul.

Can I connect the Qwiic Shim to Arduino Uno Mini? I have seen that it is for Raspberry PI.

Another option is to use I2C interface without Qwiic Shim if I do the following connections and upload the original Example1_Basics.ino to Arduino Uno Mini:

ARDUINO UNO Mini ------ SparkFun 9DoF IMU Breakout - ICM-20948
D18 (SDA) ------ I2C – SDA
D19 (SCL) ------ I2C – SCL
3.3V ------ I2C – VIN (https://www.sparkfun.com/products/15335 specifies 1.95 V to 3.6 V supply voltage)
GND ------ I2C – GND

Is it right?

With those settings, I have obtained some values for the accelerometer but weird stuff for the Gyroscope and Magnetometer (see below):

Initialization of the sensor returned: All is well.
Waiting for data
Scaled. Acc (mg) [ 00637.21, 00754.88, 00161.62 ], Gyr00001.08, -00002.69 ], Ma⸮⸮⸮B&(⸮M#� �`$� Z(⸮�Rb ��⸮<�0

If I use Arduino UNO Mini 5V for I2C - VIN, same weird stuff:

Initialization of the sensor returned: All is well.
Waiting for data
Scaled. Acc (mg) [ 00198.73, 00972.17, -00005.86 ], Gyr⸮⸮⸮⸮⸮⸮⸮eڒ�⸮⸮�⸮�⸮�⸮�⸮⸮$

:-(

[PaulZC]

Hi @vgarciavazquez ,

OK. That’s good. It proves the ICM-20948 is working.

Yes, your connections are OK. And, yes, it is OK to connect VIN to 5V. (The 3.6V must be a typo. Both the schematic and PCB say the maximum is 5.5V.)

But the ‘garbage’ for the gyro and magnetometer data is very confusing. I have not seen that before.

I do not know what to suggest. It looks like the ICM is OK, but that there is something strange about your Arduino Mini?

Is the ICM the only thing you have connected? Have you also connected the LCD from your kit? You must not connect the LCD. It is 3.3V only and your Arduino Mini is 5V. Only the ICM breakout is compatible with 5V.

Paul

[vgarciavazquez]

Hi Paul,

Thanks a lot for your support!

Regarding the Arduino Uno Mini, I am just connecting the SparkFun 9DoF IMU Breakout - ICM-20948 to the Arduino, nothing else (not the LCD). The results are displayed on Arduino IDE - Serial Monitor Tool.

What board have you used to test SparkFun 9DoF IMU Breakout - ICM-20948 other times? I selected Arduino Uno Mini since I need that the board is small for my application and this board has SPI and I2C communication (https://docs.arduino.cc/hardware/uno-mini-le).

All the best,

Veronica