Two MPU9250s: read magnetometer

[ChiaraBolgiani]

I am using two Grove IMU 9DOF (https://wiki.seeedstudio.com/Grove-IMU_9DOF_v2.0/) and I want to read angles from both of them. I already have one on address 0x69 and the other on the default 0x68 as explained in the Grove IMU. I can read the angles nicely when I use each IMU alone with the basicAHRS code.
I am trying to use the dualMPU9250_ladybug code but with an Arduino nano. I know the interrupts pin on the nano are different and I changed them to 2 and 3. I still can't read any data from the sensor. I am now wondering if my wiring is correct.

For both sensor I have:

sensor | arduino
3.3V | VCC
GND | GND
SDA | SDA + 4.7k pullup resistor
SCL | SCL + 4.7k pullup resistor

Am I missing something? I also don't have the RTC library and therefore commented everything involving it in my code, but I don't expect it creating some issues, or does it?
Thank you in advance for your help.

[kriswiner]

Are you sure you have the interrupts right? I would try simply polling the sensor data (comment out the check for interrupt flag == true) to see if you can read data.

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On Fri, Jan 22, 2021 at 8:48 AM ChiaraBolgiani ***@***.***> wrote: I am using two Grove IMU 9DOF ( https://wiki.seeedstudio.com/Grove-IMU_9DOF_v2.0/ <http://url>) and I want to read angles from both of them. I already have one on address 0x69 and the other on the default 0x68 as explained in the Grove IMU. I can read the angles nicely when I use each IMU alone with the basicAHRS code. I am trying to use the dualMPU9250_ladybug code but with an Arduino nano. I know the interrupts pin on the nano are different and I changed them to 2 and 3. I still can't read any data from the sensor. I am now wondering if my wiring is correct. For both sensor I have: sensor | arduino 3.3V | VCC GND | GND SDA | SDA + 4.7k pullup resistor SCL | SCL + 4.7k pullup resistor Am I missing something? I also don't have the RTC library and therefore commented everything involving it in my code, but I don't expect it creating some issues, or does it? Thank you in advance for your help. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#453>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKUAGN5D4A46ZJVPRPDS3GT5VANCNFSM4WOX67CA> .

[ChiaraBolgiani]

Yes, without the interrupts I can get nice readings. Why are they not working though? I don't necessarily need them but it would be nice to understand what mistake I'm making.
Thanks again for your help.

[kriswiner]

Why are they not working though? Probably because you don't have them configured properly.

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On Mon, Jan 25, 2021 at 12:47 AM ChiaraBolgiani ***@***.***> wrote: Yes, without the interrupts I can get nice readings. Why are they not working though? I don't necessarily need them but it would be nice to understand what mistake I'm making. Thanks again for your help. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#453 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKQ42HSDFN7P2GKXXXLS3UVZXANCNFSM4WOX67CA> .