AM2302 capacitive humidity sensing digital temperature and humidity module is one that contains the compound has been calibrated digital signal output of the temperature and humidity sensors. Application of a dedicated digital modules collection technology and the temperature and humidity sensing technology, to ensure that the product has high reliability and excellent long-term stability. The sensor includes a capacitive sensor wet components and a high-precision temperature measurement devices, and connected with a high-performance 8-bit microcontroller. The product has excellent quality, fast response, strong anti-jamming capability, and high cost
Features
Ultra-low power, the transmission distance, fully automated calibration, the use of capacitive humidity sensor, completely interchangeable, standard digital single-bus output, excellent long-term stability, high accuracy temperature measurement devices.
Schematic
Code
You need to add the DHT library from adafruit to the Arduino IDE – https://github.com/adafruit/DHT-sensor-library
#include "DHT.h"
#define DHTPIN A13
//our sensor is DHT22 type
#define DHTTYPE DHT22
//create an instance of DHT sensor
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(115200);
Serial.println("DHT22 sensor!");
//call begin to start sensor
dht.begin();
}
void loop() {
//use the functions which are supplied by library.
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
// print the result to Terminal
Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.println(" *C ");
//we delay a little bit for next read
delay(2000);
}
Output
Open the serial monitor and you should see something like this
Humidity: 53.30 % Temperature: 28.90 *C
Humidity: 53.30 % Temperature: 28.90 *C
Humidity: 57.10 % Temperature: 28.90 *C
Humidity: 57.30 % Temperature: 29.00 *C
Humidity: 57.10 % Temperature: 29.10 *C
Humidity: 57.30 % Temperature: 29.20 *C
Humidity: 58.40 % Temperature: 29.30 *C
Link
High Precision AM2302 DHT22 Digital Temperature & Humidity Sensor Module
