#define MUX_BIT_0 13
#define MUX_BIT_1 12
#define MUX_BIT_2 27
#define MUX_BIT_3 33
#define MUX_COM 32

#define RAIL_0 14
#define RAIL_1 15

#define PILL_SENSE 21

#define BATTERY_PIN 35

void setup() {
  Serial.begin(115200);

  pinMode(MUX_BIT_0, OUTPUT);
  pinMode(MUX_BIT_1, OUTPUT);
  pinMode(MUX_BIT_2, OUTPUT);
  pinMode(MUX_BIT_3, OUTPUT);
//  pinMode(MUX_COM, INPUT);
  pinMode(MUX_COM, INPUT_PULLDOWN);
//  pinMode(MUX_COM, INPUT_PULLUP);

  pinMode(RAIL_0, OUTPUT);
  pinMode(RAIL_1, OUTPUT);

  digitalWrite(RAIL_0, LOW);
  digitalWrite(RAIL_1, LOW);

  digitalWrite(MUX_BIT_0, LOW);
  digitalWrite(MUX_BIT_1, LOW);
  digitalWrite(MUX_BIT_2, LOW);
  digitalWrite(MUX_BIT_3, LOW);
}



void loop() {
  
  digitalWrite(RAIL_0, HIGH);
  digitalWrite(RAIL_1, LOW);
  
  digitalWrite(MUX_BIT_0, LOW);
  digitalWrite(MUX_BIT_1, LOW);
  digitalWrite(MUX_BIT_2, LOW);
  digitalWrite(MUX_BIT_3, LOW);
  delay(200);
//  Serial.println(analogRead(MUX_COM));
  Serial.println(digitalRead(MUX_COM));
}