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);
}