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標(biāo)題: double Fahrenheit(double celsius) [打印本頁]

作者: mlkhdaishgdjgau 時(shí)間: 2017-12-28 08:38
標(biāo)題: double Fahrenheit(double celsius)
double Fahrenheit(double celsius)
{
      return 1.8 * celsius + 32;
} //攝氏溫度度轉(zhuǎn)化為華氏溫度
double Kelvin(double celsius)
{
      return celsius + 273.15;
}    //攝氏溫度轉(zhuǎn)化為開氏溫度
// 露點(diǎn)（點(diǎn)在此溫度時(shí)，空氣飽和并產(chǎn)生露珠）
// 參考: wahiduddin點(diǎn)net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
      double A0= 373.15/(273.15 + celsius);
      double SUM = -7.90298 * (A0-1);
      SUM += 5.02808 * log10(A0);
      SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
      SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
      SUM += log10(1013.246);
      double VP = pow(10, SUM-3) * humidity;
      double T = log(VP/0.61078); // temp var
      return (241.88 * T) / (17.558-T);
}
// 快速計(jì)算露點(diǎn)，速度是5倍dewPoint()
// 參考: en點(diǎn)wikipedia點(diǎn)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/100);
      double Td = (b * temp) / (a - temp);
      return Td;
}
#include <dht11.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display
dht11 DHT11;
#define DHT11PIN 2
void setup()
{
  lcd.init();                   // initialize the lcd
  lcd.backlight();
  lcd.print("Waiting...");
  Serial.begin(9600);
}
void loop()
{
  int chk = DHT11.read(DHT11PIN);
  switch (chk)
  {
case DHTLIB_OK:
            lcd.setCursor(0, 0);
            lcd.print("Temp:");
            lcd.print((float)DHT11.temperature,2);
            lcd.write(0xDF);
            lcd.print("C");
            lcd.setCursor(0, 1);
            lcd.print("Humidity:");
            lcd.print((float)DHT11.humidity,2);
            lcd.print("%");
            break;
case DHTLIB_ERROR_CHECKSUM:
            lcd.clear();
            lcd.print("Checksum error");
            delay(1000);
            lcd.clear();
            break;
case DHTLIB_ERROR_TIMEOUT:
            lcd.clear();
            lcd.print("Time out error");
            delay(1000);
            lcd.clear();
            break;
default:
            lcd.clear();
            lcd.print("Unknown error");
            delay(1000);
            lcd.clear();
            break;
  }
  delay(1000);
}

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