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battery voltage strange behaviour when using battery.getConverted() on MKR Motor Carrier #54

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gbr1 opened this issue Nov 6, 2022 · 1 comment
Open

battery voltage strange behaviour when using battery.getConverted() on MKR Motor Carrier #54

gbr1 opened this issue Nov 6, 2022 · 1 comment
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topic: code Related to content of the project itself type: imperfection Perceived defect in any part of project

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@gbr1
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gbr1 commented Nov 6, 2022

Hi!
I have connected a 2s battery to the carrier.
I discovered that:

  • using (float)battery.getRaw() / 77 I obtain 7.41V
  • (float)battery.getConverted() gives 7.00V
  • (float)battery.getFiltered() gives 7.00V
    Using an external voltmeter, measure is 7.41V

Why getConverted method doesn't return 7.41V?

Thank you in advance!
@per1234 per1234 added type: imperfection Perceived defect in any part of project topic: code Related to content of the project itself labels Nov 6, 2022
@per1234
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per1234 commented Nov 6, 2022

Thanks for your report @gbr1. The reason is that the developers used an integer type in the library source code. Clearly that is not an appropriate API design for these functions.

Fortunately it is only a convenience function and the user is still able to calculate a usable battery voltage value in their own code as you did.

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topic: code Related to content of the project itself type: imperfection Perceived defect in any part of project
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