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

arduino-libraries / ArduinoMotorCarrier

GNU Lesser General Public License v3.0

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

Open gbr1 opened 2 years ago

gbr1 commented 2 years ago

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 commented 2 years ago

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.