#include "DHT.h"
#define button 2

int startTime = 0;
int pressedTime = 0;
int led = 4;
bool isProgramStart = false;

int lastPrint = 0;

DHT sensor(A0, DHT11);

void setup() {
  pinMode(button, INPUT);
  pinMode(led, OUTPUT);
  digitalWrite(button, HIGH);
  Serial.begin(9600);

  sensor.begin();
}

void loop() {
  if (!isProgramStart && isButtonPressed()) {
    startTime = millis();
    while(true) {
      if (!isButtonPressed()) {
        break;
      }
      pressedTime = millis() - startTime;
      if (pressedTime > 5000) {
        Serial.println("Sensor start!");
        isProgramStart = true;
        delay(1000);
        break;
      }
    }
  startTime = 0;
    pressedTime = 0;
  }
  if (isProgramStart) {

    if (isButtonPressed()) {
      Serial.println("Sensor off");
      digitalWrite(led, LOW);
      isProgramStart = false;
      return;
    }
    int count =  millis() - lastPrint;

    bool isPrint = count > 3000;

    if (isPrint) {
      lastPrint = 0;
    }
    float temp = sensor.readTemperature();
    if (lastPrint == 0) {
      Serial.print("temp=");
      Serial.print(temp);
      Serial.print(", ");
      Serial.print("hum=");
      Serial.print(sensor.readHumidity());
      Serial.println();
      lastPrint = millis();

      if (temp < 28) {
        digitalWrite(led, HIGH);
        delay(50);
        digitalWrite(led, LOW);
        delay(50);
      } else {
        digitalWrite(led, HIGH);
      }
    }
  }
}

boolean isButtonPressed() {
  return !digitalRead(button);
}