/**
  Basic NTC Thermistor demo
  https://wokwi.com/arduino/projects/299330254810382858

  Assumes a 10K@25℃ NTC thermistor connected in series with a 10K resistor.

  Copyright (C) 2021, Uri Shaked
*/
#define PIN 1
#define PIN 2
#define PIN 3
#define PIN 4
const float BETA = 3950; // should match the Beta Coefficient of the thermistor

void setup() {
  Serial.begin(9600);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);

  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(2, INPUT);

}



float readDistanceCM() {
  digitalWrite(9, LOW);
  delayMicroseconds(2);
  digitalWrite(9, HIGH);
  delayMicroseconds(10);
  digitalWrite(9, LOW);
  int duration = pulseIn(2, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" ℃");
  delay(1000);
  if( celsius > 50){ 
    digitalWrite(3,HIGH); 
    digitalWrite(4,LOW);
  }else {
    digitalWrite(3, LOW);
    digitalWrite(4,HIGH); 
    }



  float distance = readDistanceCM();

  bool isNearby = distance < 100;
  digitalWrite(LED_BUILTIN, isNearby);

  Serial.print("Measured distance: ");
  Serial.println(readDistanceCM());

  delay(100);
}