arduino-2-mux-simple

#define A 2
#define B 3
#define C 4
/*

  A   B   C
  0   0   0   = CH0
  1   0   0   = CH1
  0   1   0   = CH2
  1   1   0   = CH3
  0   0   1   = CH4
  1   0   1   = CH5
  0   1   1   = CH6
  1   1   1   = CH7

*/
void setup() {
  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
}

void loop() {
  toggleCH0();
}

void toggleCH0() {
  digitalWrite(A, 0);
  digitalWrite(B, 0);
  digitalWrite(C, 0);
}