double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
} //攝氏溫度度轉化為華氏溫度
double Kelvin(double celsius)
{
return celsius + 273.15;
} //攝氏溫度轉化為開氏溫度
// 露點（點在此溫度時，空氣飽和并產生露珠）
// 參考: wahiduddin點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);
}
// 快速計算露點，速度是5倍dewPoint()
// 參考: en點wikipedia點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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