Código que segue:

#include <DHT.h>

/*

AM2302 Temperature / Humidity Sensor (DHT22)

Current Code
Created by Derek Erb 30/01/2013
Modified 30/01/2013

Requirement : Arduino + AM2302 sensor connected to pin 2

DHT Library from:
https://github.com/adafruit/DHT-sensor-library

v0.03 Delays and formatting
v0.02 Delay 3 seconds between readings

*/

#include “DHT.h” DHT & AM2302 library Version number const float fVerNum = 0.03;

Data pin connected to AM2302 #define DHTPIN 2 #define DHTTYPE DHT22 DHT 22 (AM2302)

DHT dht(DHTPIN, DHTTYPE); LED pins SETUP void setup() { Setup serial monitor

Serial.begin(9600);

// Wait 3 seconds
delay(3000);

Serial.println(F("\nAM2302 Sensor"));
Serial.print(F("Version : "));
Serial.println(fVerNum);
Serial.println(F("Arduino - Derek Erb\n"));
delay(5000);

dht.begin();

}

void loop() {

// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
float t = dht.readTemperature();

check if returns are valid, if they are NaN (not a number) then something went wrong! if (isnan(t) || isnan(h)) { Serial.println(F(“Failed to read from DHT”)); } else { Serial.print(F(“Humidade: ”)); Serial.print(h); Serial.print(F(“ %\t”)); Serial.print(F(“Temperatura: ”)); Serial.print(t); Serial.println(F(“ C”)); } Wait 3 seconds

delay(3000);

}