const int analogInPin = A0;  // Analog input pin

const int pup1 = 2;
const int pup2 = 3;
const int pup3 = 4;

int sensorValue = 0;

void setup() {
  Serial.begin(9600);
  
  pinMode(pup1, INPUT);
  pinMode(pup2, INPUT);
  pinMode(pup3, INPUT);
  
  digitalWrite(pup1, LOW);
  digitalWrite(pup2, LOW);
  digitalWrite(pup3, LOW);
}

void loop() {
  Serial.print("sensor = " );
  
  
  pinMode(pup1, OUTPUT);
  delay(5);
  sensorValue = analogRead(analogInPin);
  Serial.print(sensorValue);
  Serial.print(',');
  pinMode(pup1, INPUT);
  
  
  pinMode(pup2, OUTPUT);
  delay(5);
  sensorValue = analogRead(analogInPin);
  Serial.print(sensorValue);
  Serial.print(',');
  pinMode(pup2, INPUT);
  
  
  pinMode(pup3, OUTPUT);
  delay(5);
  sensorValue = analogRead(analogInPin);
  Serial.print(sensorValue);
  pinMode(pup3, INPUT);
  
  Serial.println();
  
  delay(1000);
}