Hall sensor response (DRV5056A1)

[mprinz]

Hi,
after some days of testing the setup my enthusiasm
Is gone.

I use the DRV5056A1 with 3.3V external power and
some 10x3 mm neodymium magnets.

I find it a kind of "noisy" and fast pedal movement leads to
incorrect CC04 values, meaning detecting just - let say - 80 even if the pedal is fully pressed down. On the next hit it detects 127.

Any suggestions?

EDIT: I prepared a video. I thought it is due to the slight rotation of the magnet when pushing down the pedal... but, it rotates always. Hmmm.
https://drive.google.com/file/d/1nlF02b ... sp=sharing

Greetings

[mprinz]

Another vid showing the calibration and the "noise". I don't know if that's to much fluctuation.. is it?


https://drive.google.com/file/d/1IX2t_1 ... sp=sharing

[Rob]

It shouldn't be that noisy. Firmware is build 9?

[Rob]

And it might be necessary to put a capacitor between ground and 3.3v as close as possible to the hall sensor. This is especially true as the distance from the sensor to the supply increases and can also compensate for voltage ripple in modern switch mode power supplies, which are inherently noisy.

[Rob]

layout.jpg (186.59 KiB) Viewed 1455 times

[mprinz]

Ah okay.
Yap, I used very long wires to have more space.

And that cap will also solve the problem with the "sticky" CCs?

It's a shame, since I remember that TI graphics from the
documetation...

Thank you!

Regards

[Rob]

In general, any active electronic components need bypass capacitors.

[mprinz]

No, firmware is 1.3.2.8, I downloaded it a few days ago, and had some problems to update.
May it be good to go back to factory settings from time to time.

Is it correct that a device update is only possible with admin rights?

[Rob]

No, you do not need admin privileges. Build 8 is fine though. You don't have any caps? They are pretty common. You could probably salvage some from any old electronics you have kicking around.

[mprinz]

I'll get some caps.

During the last update it crashes in a normal user account.
Using the admin it went through.