const float BETA = 3950;
int analogValue = analogRead(A0);

float calculateTemperature(int analogVal) {
  float celsius = 1 / (log(1 / (1023.0 / analogVal - 1)) / BETA + 1.0 / 298.15) - 273.15;
  return celsius;
}

void setup() {
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int sel = map(analogRead(A1), 0, 1023, 0, 3);

  switch (sel) {
    case 0:
      ch0();
      break;
    case 1:
      ch1();
      break;
    case 2:
      ch2();
      break;
    case 3:
      ch3();
      break;
    default:
      ch3(); 
      break;
  }

  int val = analogRead(A0);
  float temp = calculateTemperature(val);
  Serial.print("Temperature=");
  Serial.println(temp);
  delay(1000); 
}

void ch0() {Serial.print("Channe0=");

  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
}

void ch1() {Serial.print("Channe1=");

  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, HIGH);
}

void ch2() {Serial.print("Channel2=");

  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, HIGH);
  digitalWrite(7, LOW);
}

void ch3() {Serial.print("Channel3=");

  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
}

void tep1(){
Serial.print("Temperature1=");
digitalWrite(4,LOW);
digitalWrite(5,HIGH);
digitalWrite(6,LOW);
digitalWrite(7,LOW);
}

void tep2(){
Serial.print("Temperature2=");
digitalWrite(4,HIGH);
digitalWrite(5,HIGH);
digitalWrite(6,LOW);
digitalWrite(7,LOW);
}