DHT22 sensor de temperature et humidité

19 Mai 2019 , Rédigé par cnickelfr Publié dans #Electronique et robots

DHT22 sur aliexpress

Telecharger les librairies suivantes :

DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
les installer dans "/scketchbook/libraries"

Connections du senseur:

Le pin+ sur 3V
Le pin - sur GND
Le pin data (central) sur un pin digital, D2 par exemple.

Code

#include "DHT.h"
#define DHTPIN 2 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22

// Initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);
void setup() {

Serial.begin(9600);
Serial.println(F("DHTxx test!"));

dht.begin();
}

void loop() {
// Wait a few seconds between measurements.
delay(2000);

// Reading temperature or humidity takes about 250 milliseconds!
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);

// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}

// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);

Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("\260C "));//caractere special pour°
Serial.print(f);
Serial.print(F("\260F Heat index: "));
Serial.print(hic);
Serial.print(F("\260C "));
Serial.print(hif);
Serial.println(F("\260F"));
}

Lire le resultat sur serial console

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