#include "DHT.h"

#define DHTPIN 2     // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.

#define DHTTYPE DHT11   // DHT 11

// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors.  This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);

//构建舵机
#include <Servo.h>
Servo myservo;  // create servo object to control a servo
int pos = 90;    // variable to store the servo position  min:45 max:135

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  pinMode(3,OUTPUT);
  pinMode(4,INPUT);
  dht.begin();

  //定义舵机的针脚
  myservo.attach(9);  // attaches the servo on pin 9 to the servo objec
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

//温度单位的转化
  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

//输出打印sensor获取的湿度和温度
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
  if(h >= 80){
    digitalWrite(3,HIGH);
    digitalWrite(5,LOW);
    }else{
      digitalWrite(3,LOW);
      digitalWrite(5,HIGH);
      }

//检测人体传感器是否正常工作
 if (isnan(digitalRead(4))){
  Serial.println(F("Failed to read from human body sensor!"));
    return;
  }

//人体传感器检测是否有人靠近
 if(digitalRead(4) == HIGH){
  Serial.println("Someone here!");
  
  //舵机工作，摇尾巴
  for (pos = 90; pos <= 135; pos += 1) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(5);                       // waits 15ms for the servo to reach the position
  }
  for (pos = 135; pos >= 45; pos -= 1) { // goes from 180 degrees to 0 degrees
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(5);                       // waits 15ms for the servo to reach the position
  }
  for(pos = 45 ; pos <= 90 ; pos += 1){
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(5); 
  }
 
  
  }
  
}