- 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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