I am building a small controller box based on an Arduino or similar MCU board.
There are upto 6 buttons on the controller.
In regards to ground, can I daisy chain the ground round all switches? Fundamentally it seems to work ok. For example: Arduino GND--> Btn1 --> Btn2 --> Btn3 etc.
Or is it better to have a single wire to each button from the Arduino GND pin.
This seems an easy way in terms of less wiring.
The wire is 7/0.2 (24AWG).
What are the pro's and cons here?
Additionally, there are 3 GND pins on the Ardunio, why would you use all 3?