what component is the interface board in red marker part？

[ch li]

[Romilly Cocking]

It's a diode bridge, which prevents GPIO inputs from going much below 0 volts or above 3.3 volts.

Romilly

On 29 August 2014 04:37, ch li <gia.ac...@gmail.com> wrote:

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[Andrew Scheller]

See http://quick2wire.com/interface-board-schematic/ for more details...