Hello Luck, Thank you for your post! By default, the GPIO pins are configured as inputs. You can leave the pins configured as inputs and use a single 10-kOhm resistor to ground if they are unused. If you change the GPIO pins to be configured as outputs, then you can leave the pins floating. You do not need to put a resistive load to ground on the GPIO pins if they are configured as outputs and unused. The goal is make sure that a voltage is driven on the GPIO pins to reduce noise coupling. Best regards,
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