MicroPython for Micro:bit - Analogue Inputs and Outputs

[@991122bc]

Enjoy the way you explain , clear and concise

[@belectroart]

Hi I am more used to Arduino but just started playing with Micro:Bit I notice you use a resistor to prevent Analog Input from becoming Zero Volts. I have found that if an Analog Input is at GND then the Microbit stops or at least the screen freezes until the level is above 0V Why is this? I am unable to find any documentation about this, it is very strange behavior.