Problems with a 4051 multiplexer

Other Hardware LEDs and Multiplexing
8

spoocter:

can i use only a part of the channel array - channel0 and channel1, because i dont need the others for now.

To read the button on channel 0, use digitalReadMux(0).
To read the button on channel 1, use digitalReadMux(1).

and i should write digitalWrite(ledpin,digitalRead(digitalReadMux) ?

Depends on which button you want to copy to the LED. You probably want something like:

digitalWrite(ledpin, digitalReadMux(0));  // LED follows button on Mux channel 0

EDIT : i will update the code to contain the lines for the led