Problems with a 4051 multiplexer

Other Hardware LEDs and Multiplexing
6

Just use this digitalReadMux() in place of digitalRead() for your buttons.

const int select[] = {8,9,10}; // array of the pins connected to the 4051 input select lines
const int analogPin = A1; // the analog pin connected to the multiplexer output

boolean digitalReadMux(int channel)
{
  // the following sets the selector pins HIGH and LOW to match the binary value of channel
  for(int bit = 0; bit < 3; bit++)
  {
    int pin = select[bit]; // the pin wired to the multiplexer select bit
    int isBitSet = bitRead(channel, bit); // true if given bit set in channel
    digitalWrite(pin, isBitSet);
  }
  pinMode(analogPin, INPUT)
  return digitalRead(analogPin);
}

// this function returns the analog value for the given channel
int analogReadMux( int channel)
{
  // the following sets the selector pins HIGH and LOW to match the binary value of channel
  for(int bit = 0; bit < 3; bit++)
  {
    int pin = select[bit]; // the pin wired to the multiplexer select bit
    int isBitSet = bitRead(channel, bit); // true if given bit set in channel
    digitalWrite(pin, isBitSet);
  }
  return analogRead(analogPin);
}