arduino使用oled显示时间MQ_2温湿度

这代码一般都是复制过来，在小改下就行了

代码如下：

double Fahrenheit(double celsius)
{
        return 1.8 * celsius + ;
}    //摄氏温度度转化为华氏温度

double Kelvin(double celsius)
{
        return celsius + 273.15;
}     //摄氏温度转化为开氏温度

// 露点（点在此温度时，空气饱和并产生露珠）
// 参考: http://wahiduddin.net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
        double A0= 373.15/(273.15 + celsius);
        double SUM = -7.90298 * (A0-);
        SUM += 5.02808 * log10(A0);
        SUM += -1.3816e-7 * (pow(, (11.344*(-/A0)))-) ;
        SUM += 8.1328e-3 * (pow(,(-3.49149*(A0-)))-) ;
        SUM += log10(1013.246);
        double VP = pow(, SUM-) * humidity;
        double T = log(VP/0.61078);   // temp var
        return (241.88 * T) / (17.558-T);
}

// 快速计算露点，速度是5倍dewPoint()
// 参考: http://en.wikipedia.org/wiki/Dew_point
double dewPointFast(double celsius, double humidity)
{
        double a = 17.271;
        double b = 237.7;
        double temp = (a * celsius) / (b + celsius) + log(humidity/);
        double Td = (b * temp) / (a - temp);
        return Td;
}
static const unsigned char PROGMEM str_1[] =
{
0x00,0x08,0x43,0xFC,0x32,0x08,0x12,0x08,
      0x83,0xF8,0x62,0x08,0x22,0x08,0x0B,0xF8,
      0x10,0x00,0x27,0xFC,0xE4,0xA4,0x24,0xA4,
      0x24,0xA4,0x24,0xA4,0x2F,0xFE,0x20,0x00,
  };//温

static const unsigned char PROGMEM str_2[] =
{
0x01,0x00,0x00,0x84,0x3F,0xFE,0x22,0x20,
      0x22,0x28,0x3F,0xFC,0x22,0x20,0x23,0xE0,
      0x20,0x00,0x2F,0xF0,0x22,0x20,0x21,0x40,
      0x20,0x80,0x43,0x60,0x8C,0x1E,0x30,0x04,
  };  // 度

static const unsigned char PROGMEM str_3[] =
{
0x00,0x08,0x47,0xFC,0x34,0x08,0x14,0x08,
      0x87,0xF8,0x64,0x08,0x24,0x08,0x0F,0xF8,
      0x11,0x20,0x21,0x20,0xE9,0x24,0x25,0x28,
      0x23,0x30,0x21,0x24,0x3F,0xFE,0x20,0x00,
  }; //湿
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <dht11.h>
#include <DS3231.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>

dht11 DHT11;
#define DHT11PIN 2
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);  

#define LOGO16_GLCD_HEIGHT 16 //定义显示高度
#define LOGO16_GLCD_WIDTH  16 //定义显示宽度  

#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif
void printDateTime(DateTime dateTime);
//创建实例
RTC_DS1307 RTC;

DS3231 Clock;
bool Century=false;
bool h12;
bool PM;
uint8_t bell[] = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
char data[];
char Str_year[], Str_month[], Str_date[], Str_DoW[], Str_hour[], Str_minute[], Str_second[];
String recivedStr="";//接收到的字符串
int recivedNum =;//接收到的字符个数
void setup()   {
  Serial.begin();
  Wire.begin();
  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3D (for the 128x64)  //OLED 的I2C位置
  // init done  

  display.clearDisplay();
  ////////////////

 // Serial.println("Please enter the time: year[2]month[2]date[2]DoW[2]hour[2]minute[2]second[2]");
 // Serial.println("example: 2014-12-3 Wednesday 14:15:15 enter:14120303141515");//1703072154
  //英文字符显示
  //display.setTextSize(1);             //设置字体大小
  //display.setTextColor(WHITE);        //设置字体颜色白色
  //display.setCursor(0,0);             //设置字体的起始位置
  //display.println("   zhongbest.com");//输出字符并换行
  //display.display();                  //把缓存的都显示
  //初始化实时时钟
  RTC.begin();
}  

void loop() {
   int chk = DHT11.read(DHT11PIN);

 // Serial.print("Read sensor: ");
//  switch (chk)
//  {
//    case DHTLIB_OK:
//                Serial.println("OK");
//                break;
//    case DHTLIB_ERROR_CHECKSUM:
//                Serial.println("Checksum error");
//                break;
//    case DHTLIB_ERROR_TIMEOUT:
//                Serial.println("Time out error");
//                break;
//    default:
//                Serial.println("Unknown error");
//                break;
//  }
  display.clearDisplay();
  //英文字符显示
  display.setTextSize();             //设置字体大小
  display.setTextColor(WHITE);        //设置字体颜色白色
  display.setCursor(,);             //设置字体的起始位置  

 // display.print("Humidity(%):");
 // display.println((float)DHT11.humidity, 2);

 // display.print("Temperature(oC):");

//  display.print("Temperature(oF):");
//  display.println(Fahrenheit(DHT11.temperature), 2);
//
//  display.print("Temperature(K):");
//  display.println(Kelvin(DHT11.temperature), 2);
//
//  display.print("Dew Point(oC):");
//  display.println(dewPoint(DHT11.temperature, DHT11.humidity));
//
//  display.print("Dew PointFast(oC):");
//  display.println(dewPointFast(DHT11.temperature, DHT11.humidity));
  //中文字符显示
  display.drawBitmap(, , str_1, , , ); //在坐标X:26  Y:16的位置显示中文字符中
  display.drawBitmap(, , str_2, , , ); //在坐标X:42  Y:16的位置显示中文字符贝
  display.setCursor(,);             //设置字体的起始位置
  display.setTextSize();             //设置字体大小
  display.print(":");
  display.println((float)DHT11.temperature, );
   display.drawBitmap(, , str_3, , , ); //在坐标X:26  Y:16的位置显示中文字符中
  display.drawBitmap(, , str_2, , , ); //在坐标X:42  Y:16的位置显示中文字符贝
  display.setCursor(,);             //设置字体的起始位置
   display.setTextSize();             //设置字体大小
  display.print(":");
  display.println((float)DHT11.humidity, );
  int val;
  val=analogRead();
 // Serial.println(val,DEC);
  display.setCursor(,);             //设置字体的起始位置
  display.print("MQ-2: ");
  display.println(val,DEC);
 // display.setCursor(0,60);
  display.print("-------------------");
  DateTime now = RTC.now();
//通过串口传送当前的日期和时间
  printDateTime(now);

  ///////////////////////////////////////////////////////////

   while(Serial.available() > )//读取字符串
   {
      recivedStr += char(Serial.read());
//      delay(2);
      recivedNum = recivedNum+;
   }
   if(recivedNum == )
   {  //year[2]month[2]date[2]DoW[2]hour[2]minute[2]second[2]
       String strtemp = "";
       strtemp = recivedStr.substring(,);
       int years = strtemp.toInt();
       RTC.set(RTC_YEAR,years);//设置年

       strtemp = recivedStr.substring(,);
       int months = strtemp.toInt();
       RTC.set(RTC_MONTH,months);//设置月

       strtemp = recivedStr.substring(,);
       int days = strtemp.toInt();
       RTC.set(RTC_DAY,days);//设置日

       strtemp = recivedStr.substring(,);
       int hours = strtemp.toInt();
       RTC.set(RTC_HOUR,hours);//设置小时

       strtemp = recivedStr.substring(,);
       int minutes = strtemp.toInt();
       RTC.set(RTC_MINUTE,minutes);//设置分钟

       strtemp = recivedStr.substring(,);
       int seconds = strtemp.toInt();
       RTC.set(RTC_SECOND,seconds);//设置秒
       recivedNum = ;
   }
  display.display();                  //把缓存的都显示
  delay();
} 

void printDateTime(DateTime dateTime) {
    //传送年份
     display.setCursor(,);             //设置字体的起始位置
    display.print(dateTime.year(), DEC);
    display.print('/');
    //传送月份
    display.print(dateTime.month(), DEC);
    display.print('/');
    //传送月份中的第几天
    display.print(dateTime.day(), DEC);
    display.print(' ');
    //传送小时
    display.print(dateTime.hour(), DEC);
    display.print(':');
    //传送分钟
    display.print(dateTime.minute(), DEC);
    display.print(':');
    //传送秒
    display.print(dateTime.second(), DEC);
    display.display();                  //把缓存的都显示
}

模块：

OLED12864显示屏:

模块针脚        Arduino针脚

VCC     ---->   3.3V

GND    ---->    GND

SCL     ---->    A5

SDA    ---->    A4

烟雾传感器MQ-2:

VCC     ---->    5V

GND    ---->    GND

A0       ---->    A0

温湿度传感器DHT11:

+       ------>   5V

OUT  ------>    2

-       ------>    GND

时钟模块DS1307:

SCL     ------->   A5

SDA    ------->   A4

VCC    ------->   5V

GND   ------->  GND