Hi, I'm currently working with Microbits and I'm wondering when I need the 3V connection. The 3V connection is a voltage divider. According to ChatGPT, "The voltage divider ensures that the measured voltage is converted into a digital value from 0 to 1023. " So, for example, I need 3V if I have a potentiometer installed, right? And what voltage is "divided"? The voltage from the negative (GND) to the positive (P0)?
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The microbit is 3.3V system should therefore be each input voltage maximum 3.3V.
So if you start a potentiometer from 3.3V to mass.
A probe from the GPIO to GND or from 3.3V to the GPIO.
The 3.3V are also not a voltage divider but the output of the 3.3V voltage regulator and at the same time the reference voltage of the ADC.