#include <Adafruit_SSD1306.h>
#include <Wire.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <DS18B20.h> 


// 定义DS18B20数据口连接ESP32的4号IO上
#define ONE_WIRE_BUS 4

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// 初始连接在单总线上的单总线设备
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

const char* ssid = "yangyong";
const char* password = "";

String lastPrice;
unsigned long previousMillis = 0; //毫秒时间记录
const long interval = 1000;       //时间间隔
//
DS18B20 ds18b20(4);

void setup() {
  Serial.begin(115200);
  pinMode(33, OUTPUT);
  Serial.println("Dallas Temperature IC Control Library Demo");
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  display.clearDisplay();
  display.setTextSize(1.5);           
  display.setTextColor(SSD1306_WHITE);      
  display.setCursor(0,0); 
  display.println("welcome Smart Water Dispenser");
  display.println("Designed by Yangxiyuan");
  display.display();


  Serial.println("welcome Smart Water Dispenser");
  display.display();
  delay(5000);
  // 初始库
  sensors.begin();
}

void loop() 
{
  // 点亮LED灯
  digitalWrite(33, HIGH);  
  delay(1000);
  digitalWrite(33, LOW);  
  delay(1000);
  // 记录温度
  double temp = ds18b20.getTempC();//Read the temperature
    delay(1000);
  temp *= 0.0625;//The conversion accuracy is 0.0625/LSB
  Serial.print(" ds18b20 Temperature: ");
  Serial.print(temp);
  Serial.println(" ℃");
  delay(1000);

  // Serial.print("Requesting temperatures...");
  // sensors.requestTemperatures(); // 发送命令获取温度
  // Serial.println("DONE");
  // Serial.print("Temperature for the device 1 (index 0) is: ");
  // Serial.println(sensors.getTempCByIndex(0));
  // delay(500); 

  display.clearDisplay();
  display.setTextSize(1.5);           
  display.setTextColor(SSD1306_WHITE);      
  display.setCursor(0,0); 
  display.print("Temperature:");
  display.print(temp);
  display.println("℃");
 // display.println(sensors.getTempCByIndex(0));
  display.display();
  delay(1000);

//以下段落相当于每秒读取前次温度，并发起新一次温度转换
  // unsigned long currentMillis = millis();         //读取当前时间
  // if (currentMillis - previousMillis >= interval) //如果和前次时间大于等于时间间隔
  // {
  //   previousMillis = currentMillis; //更新时间记录

  //   float tempC = sensors.getTempCByIndex(0); //获取索引号0的传感器摄氏温度数据
  //   if (tempC != DEVICE_DISCONNECTED_C)       //如果获取到的温度正常
  //   {
  //     Serial.print("\n当前温度是： ");
  //     Serial.print(tempC);
  //       display.print(tempC);
  //       display.display();
  //     Serial.println(" ℃");
  //   }

  //  sensors.requestTemperatures(); //发起新的温度转换
 //}

  //delay(20);

}

void printCenter(const String buf, int x, int y)
{
  int16_t x1, y1;
  uint16_t w, h;
  display.getTextBounds(buf, x, y, &x1, &y1, &w, &h); //calc width of new string
  display.setCursor((x - w / 2) + (128 / 2), y);
  display.print(buf);
}