What is the purpose of null-resistors R5=0, R6=0 in the Grove_Dual_Button board? Are there any recommendations in what situations and in what resistance range they can be changed?
i think they are pull down resistors to let it function as a 5v or 3v3 unit and switch debouncing
The pull-up resistors are R3=4.7k and R4=4.7k. I am asking about resistors R5, R6, which have zero resistance and can be replaced with jumpers. Instead of R5, R6, you can put other resistors, but then Seeed Studio should tell about their purpose and resistance
Hi there,
The word on the Street is 
They are current limit resistors for Inputs, jic the user wants to use a Higher VCC. or just limit syncing /sourcing current from/to the input.
HTH
GL 
PJ 
i think that is what i said… if not in a slightly less technical way
yes 0 ohm resisters are usually as a place holder… or when the board needs to look AWESOME…
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