#define BLUE    7
#define GREEN  4
#define RED   2

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(RED, OUTPUT);
pinMode(BLUE, OUTPUT);
pinMode(GREEN, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
const float BETA = 3950; // should match the Beta Coefficient of the thermistor
int analogValue = analogRead(A0);
float temp = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;


Serial.println(temp);

if (temp <10) {
  Serial.println("холодно");
  digitalWrite(BLUE, HIGH); //включаем 
digitalWrite(GREEN, LOW); //выключаем
digitalWrite(RED, LOW); //выключаем  
  }

if (temp >=10 && temp <=20 ) {
  Serial.println("рабочий режим");
    digitalWrite(BLUE, LOW); //включаем
  digitalWrite(GREEN, HIGH); //включаем
digitalWrite(RED, LOW); //включаем
  }

if (temp >20) {
  
  Serial.println("горячо");
      digitalWrite(BLUE, LOW); //включаем
  digitalWrite(GREEN, LOW); //включаем
  digitalWrite(RED, HIGH); //включаем  
  }

//delay(1000);
}