Robot Controller Digital Input

[Lloyd Burns]

Relay o/p are indeed 0V or 5V ! Connecting a relay o/p pin, either W/Y or R, to a digital input pin will indeed give you control of those LEDs.

I relied on the diagram IFI posted, showing the gate with 10k pullup to voltage.


BTW, a 2002 RC input switched the switch LED on the OI at 1V< Vin < 2V, so it is not a CMOS (4000 series or 74HCMOS) compatible input, unless IFI used 3V logic, and against that, the open circuit voltage of the pin is 5V. It could still be 74HCTxxx compatible.