Go Down

Topic: sensor HIH 43030 sparkfun [fr] (Read 317 times) previous topic - next topic

florent117

Apr 21, 2014, 10:27 pm Last Edit: Apr 22, 2014, 07:15 pm by florent117 Reason: 1
Bonjours, pouvez vous m'aider à comprendre le programme svp. C'est pour mon bac , je dois faire un programme pour mesurer la tempérarure, humidté etc. Je voudrais qu'on m'explique la partie avec les calculs. Merci de votre aide :smiley-red:

int HIH4030_Pin = A0; //analog pin 0

void setup(){
 Serial.begin(9600);
}

void loop(){

 //To properly caculate relative humidity, we need the temperature.
 float temperature = 25; //replace with a thermometer reading if you have it
 float relativeHumidity  = getHumidity(temperature);

 Serial.println(relativeHumidity);

 delay(500); //just here to slow it down so you can read it
}


float getHumidity(float degreesCelsius){
 //caculate relative humidity
 float supplyVolt = 5.0;

 // read the value from the sensor:
 int HIH4030_Value = analogRead(HIH4030_Pin);
 float voltage = HIH4030_Value/1023. * supplyVolt; // convert to voltage value

 // convert the voltage to a relative humidity
 // - the equation is derived from the HIH-4030/31 datasheet
 // - it is not calibrated to your individual sensor
 //  Table 2 of the sheet shows the may deviate from this line
 float sensorRH = 161.0 * voltage / supplyVolt - 25.8;
 float trueRH = sensorRH / (1.0546 - 0.0026 * degreesCelsius); //temperature adjustment

 return trueRH;
}

michinyon

Est google brisé dans votre pays ?



robtillaart

Please rephrase your question in English on the international part of the forum...
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

Go Up
 


Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy