#include <DHT.h>
#include <Servo.h>
#define DHTPIN 7
#define DHTTYPE DHT22
//previous value of temperature
double T_pre = -100;
//previous value of humidity
double H_pre = 0;
//if temperature or humidity changes by 1 degree or 1%, it rotates 10 degrees
int degree = 10;
DHT dht(DHTPIN, DHTTYPE);
Servo lacingUnit;
void setup() {
  Serial.begin(9600);
  dht.begin();
  lacingUnit.attach(9);
}
void loop() {
  double humi = dht.readHumidity();
  double temp = dht.readTemperature();
  if(temp != T_pre || humi != H_pre ){
	//how temperature change
    int n = (temp - T_pre) / degree;
    //how humidity change
    int hn = (humi - H_pre) / degree;
    //lacing unit starts wokring depend on temperature and humidty
    lacingUnit.write((n+hn) * degree);
  }
  //store temp to T_pre for next round
  T_pre = temp;
  //store humi to T_pre for next round
  H_pre = humi;
  Serial.print("T: ");
  Serial.print(temp);
  Serial.print("°C");
  Serial.print("%\t");
  Serial.print("H: ");
  Serial.print(humi);
  Serial.print("\n");
  //detect temperature and humidity every 30s
  delay(30000);
}