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kriswiner / MPU9250

Arduino sketches for MPU9250 9DoF with AHRS sensor fusion
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Reliable MPU9250 #445

Open luizamanfrini opened 3 years ago

luizamanfrini commented 3 years ago

Hey Kris, how are you?

Where can I get reliable MPU-9250. I've been struggling with mine because and I think they are fake.

Thank you!

kriswiner commented 3 years ago

As you might know, the MPU9250 are out of production since January 2020. I have some real ones, and I have some fake ones. You can take your chances and order from Aliexpress, but this is hit and miss...

On Thu, Dec 3, 2020 at 10:27 AM luizamanfrini notifications@github.com wrote:

Hey Kris, how are you?

Where can I get reliable MPU-9250. I've been struggling with mine because and I think they are fake.

Thank you!

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/kriswiner/MPU9250/issues/445, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABTDLKQHHQM4MMQBEGXJTN3SS7J7TANCNFSM4UMLTCKA .

luizamanfrini commented 3 years ago

Thank you Kris! I've been having some trouble connecting to the magnetometer, that's why I think my sensor might be fake. Its who am I is 0xFF instead of 0x48. Also, I am having some trouble to use is as SPI.

kriswiner commented 3 years ago

Yes, there are some Chinese variants that only have the accel/gyro...

If you just need a few I can sell them to you...

On Thu, Dec 3, 2020 at 10:35 AM luizamanfrini notifications@github.com wrote:

Thank you Kris! I've been having some trouble connecting to the magnetometer, that's why I think my sensor might be fake. Its who am I is 0xFF instead of 0x48. Also, I am having some trouble to use is as SPI.

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luizamanfrini commented 3 years ago

Would you ship to Brazil?

kriswiner commented 3 years ago

Yes, but is $14.95 first class airmail good/reliable enough? Maybe cheaper for you to buy from aliexpress....

On Thu, Dec 3, 2020 at 10:38 AM luizamanfrini notifications@github.com wrote:

Would you ship to Brazil?

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GitMoDu commented 3 years ago

Any thoughts on a successor chip, for the future?

kriswiner commented 3 years ago

Yes, TDK makes the ICM20948 https://invensense.tdk.com/products/motion-tracking/9-axis/icm-20948/ which is literally the successor to the MPU9250. You can get 2 degree heading accuracy using its embedded DMP, so overall a pretty good choice. However, I don;t like the dual power rail (1.8 and 3.3 V required) and I don;t like loading a binary blob to get fusion performance. So we don;t use this.

We use instead ST Micro's LSM6DSM accel/gyro combo sensor and LIS2MDL magnetometer. Lately we have started using the MMC5983A https://www.digikey.com/en/products/detail/memsic-inc/MMC5983MA/10452795?s=N4IgTCBcDaILZwMYFYCcAOAzCAugXyA since it offers much higher resolution and much lower noise.

More info here https://hackaday.io/project/160283-max32660-motion-co-processor.

On Mon, Dec 7, 2020 at 2:23 AM André notifications@github.com wrote:

Any thoughts on a successor chip?

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GitMoDu commented 3 years ago

I'll look into those new ICs. I agree with having magic blobs is counter to the embedded mentality of absolute control.

Thank you very much, your efforts to make these complicated devices usable have been wonderful!