- double Fahrenheit(double celsius)
- {
- return 1.8 * celsius + 32;
- }
- double Kelvin(double celsius)
- {
- return celsius + 273.15;
- }
- 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);
- }
- 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>
- dht11 DHT11;
- #define DHT11PIN 2 [size=8.991pt]
- void setup()
- {
- Serial.begin(9600);
- Serial.println("DHT11 TEST PROGRAM ");
- Serial.print("LIBRARY VERSION: ");
- Serial.println(DHT11LIB_VERSION);
- Serial.println();
- }
- void loop()
- {
- Serial.println("\n");
- 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;
- }
- Serial.print("Humidity (%): ");
- Serial.println((float)DHT11.humidity, 2);
- Serial.print("Temperature (oC): ");
- Serial.println((float)DHT11.temperature, 2);
- Serial.print("Temperature (oF): ");
- Serial.println(Fahrenheit(DHT11.temperature), 2);
- Serial.print("Temperature (K): ");
- Serial.println(Kelvin(DHT11.temperature), 2);
- Serial.print("Dew Point (oC): ");
- Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
- Serial.print("Dew PointFast (oC): ");
- Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
- delay(2000);
- }
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