STEVAL-MKI109V3 stops reading from sensor in MEMS Studio

[Joerg Wagner]

Hello.

I have a small fan at home with STEVAL-MKI245A attached and STEVAL-MKI109V3 is near the fan as well,

like you would using PROTEUS1.

The fan offers 3 mechanical switches to modify the speed.

Using the switches causes a stop of reading data from the sensor in MEMS Studio.

I tried Linux, Windows and MacOS with STEVAL-MKI109V3 (Firmware: 3.67.1) always with a notebook detached from a power source.

Sometimes under "Sensor Evaluation / Data Monitor" the message "Log data view not active at high data rate" appears, regardless which scale setting or Output Data Rate is used.

Many times the Accelerometer and Gyroscope Output Data Rates are set to "Power Down" automatically,

respectively register CTRL_1 and CTRL_2 are set to 0x00 and I don't know who is doing this.

In this case I'm not able to write different values than 0x00.

The only solution is to reset the board.

I'm worried to use it in industrial environment even if it's not stable at home.

[Federica Bossi]

Hi @Joerg Wagner ,

Based on your description it looks like the usage of the switch is affecting the sensor power supply causing registers to be restored to their default value. Would you mind to verify power supply signal and eventually provide us further details on your setup?
Thank you

[Joerg Wagner]

Hi @Federica Bossi ,

The adapter board is connected via USB at the notebook which uses it's own battery, no power supply.

This means everything is isolated from AC power.

It's just a fan (as a vibration source), STEVAL-MKI245 attached to STEVAL-MKI109V3 and this via to a notebook.

The sensor module is sticked with tape on the fan.

But I will use a scope to check the power supply signal of the board later.

Have a nice day.