#include <OneWire.h>
#include <DallasTemperature.h>
#include <PID_v2.h>

// 定义DS18B20温度传感器引脚
#define ONE_WIRE_BUS 11

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// 定义PID参数
double setpoint = 28.0;
double kp = 2.0; // 2
double ki = 5.0;  // 5
double kd = 1.0;  // 1

double input, output;
PID pid(&input, &output, &setpoint, kp, ki, kd, DIRECT);

void setup() {
  Serial.begin(9600);
  sensors.begin();
  
  // 初始化PID
  pid.SetMode(AUTOMATIC);
}

void loop() {
  sensors.requestTemperatures();
  
  // 读取温度值
  input = sensors.getTempCByIndex(0);

  // 更新PID计算
  pid.Compute();
  
  Serial.print("Current temperature: ");
  Serial.println(input);
  Serial.print("PID output: ");
  Serial.println(output);
  
  // 控制温度
  analogWrite(9, output);
  
  delay(1000);
}