/*	https://wokwi.com/projects/406690699742710785
    https://journals.ametsoc.org/view/journals/bams/86/2/bams-86-2-225.xml
    

Td = t - ((100 - RH)/5.) 
where Td is dew point temperature (in degrees Celsius), 
      t is observed temperature (in degrees Celsius), 
and   RH is relative humidity (in percent). 
Apparently this relationship is fairly accurate for relative humidity values above 50%.
*/

#include <DHT22.h>
//define pin data
#define pinDATA SDA // SDA, or almost any other I/O pin

DHT22 dht22(pinDATA); 

  float  t;
  float RH;
  float Td;
 
void setup() {
  Serial.begin(115200); //1bit=10µs
  Serial.println("\Simulation DTH22");
}

void loop() {
  Serial.println(dht22.debug()); //optionnal

     t = dht22.getTemperature();
    RH = dht22.getHumidity();
    Td = t - ((100 - RH)/5);

  if (dht22.getLastError() != dht22.OK) {
    Serial.print("last error :");
    Serial.println(dht22.getLastError());
  }

  Serial.print("RH=");  Serial.print(RH,1);   Serial.print("\t");
  Serial.print("t=");   Serial.print(t,1);    Serial.print("\t");
  Serial.print("D.P.=");Serial.println(Td,1);

  delay(2000); //Collecting period should be : >1.7 second
}