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Luisa_97
Associate II
May 19, 2025 12:51 PM UTC
Solved

How to use AH_QVAR on STEVAL MKI250KA

Hi, I have STEVAL MKI109D, on it I mounted STEVAL MKI250KA. I would say if I could use QVAR Swipe Electrode mounted on STEVAL MKI250KA for reading Qvar signal. It is possible?

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Federica Bossi
Federica BossiBest answer
ST Technical Moderator
May 26, 2025 9:34 AM UTC

Hi @Luisa_97 ,

Series capacitors CS1 and CS2 are used to remove DC voltage. By replacing these capacitors with a short, it can be used for UI applications (it is recommended to set the gain to 16x to ensure saturations).

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3 replies

casadeib
ST Employee
May 20, 2025 12:38 PM UTC

Hi @Luisa_97 ,

In order to use QVAR Swipe electrode on STEVAL MKI250KA there are some modification that have to be implemented, otherwise for QVAR functionalities you can use MKI235KA.

Hope this could help.

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Luisa_97Author
Associate II
May 20, 2025 4:21 PM UTC

Hi @casadeib ,

Could you specify what modifications are required? I am usinf MKI235KA, but I would like to compare the signals recorded from both devices in MEMS-Studio to observe any differences. 

Thanks.

Federica Bossi
Federica BossiBest answer
ST Technical Moderator
May 26, 2025 9:34 AM UTC

Hi @Luisa_97 ,

Series capacitors CS1 and CS2 are used to remove DC voltage. By replacing these capacitors with a short, it can be used for UI applications (it is recommended to set the gain to 16x to ensure saturations).

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question.
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