Available as an assembled Module and as a DIY project.
This Module is currently available.
Manual gates
With the ADDAC304 Manual Gates you'll be getting 8 manual gates (0 +5v) in a nifty package - a perfect way to perform on and control your modular system.
The ADDAC304 comes with an interesting twist: 4 out of the 8 available gates can act as momentary switches, outputting the signals in their respective inputs when each gate’s button is pressed.
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These merchants probably sell this module. Huh?
ADDAC System ADDAC304 Manual Gates
ADDAC System ADDAC304 Manual Gates
ADDAC System 304 Manual Gates