Crowtail- AM2302 Humidity&Temperature Sensor
Contents
Description
The module contains a AM2302 temperature & humidity sensor that is a complex sensor with a calibrated digital signal out.It use digital module acquisition technology and the temperature&humidity sensor technology.Sensor consists of a resistance type moisture element and a NTC temperature measuring element. Because of single wire serial interface, it is easy to use the module.
Model: CT009180A
Specification
Dimensions(mm):43.2(L)x20.0(W)x9.5(H)
Usage
This demo is going to show you how to read temperature and humidity information from this Crowtail- AM2302 Humidity&Temperature Sensor.
1.Hardware Connection
The Temperature and Humidity sensor is connecting to digital port A0 of Crowtail- Base Shield.
2.Download AM2302 Humidity&Temperature Sensor library for Arduino boards with 16MHz XTAL; Unzip and put it in the libraries file of Arduino IDE by the path: ..\arduino-1.0\libraries;
3.Open “DHTtester” example via the path: File --> Examples --> DHT --> DHTtester.
// Example testing sketch for various DHT humidity/temperature sensors #include "DHT.h" #define DHTPIN A0 // what pin we're connected to // Uncomment whatever type you're using! // #define DHTTYPE DHT11 // DHT 11 #define DHTTYPE DHT22 // DHT 22 (AM2302) //#define DHTTYPE DHT21 // DHT 21 (AM2301) // Connect pin 1 (on the left) of the sensor to +5V // Connect pin 2 of the sensor to whatever your DHTPIN is // Connect pin 4 (on the right) of the sensor to GROUND // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(9600); Serial.println("DHTxx test!"); 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("Failed to read from DHT"); } else { Serial.print("Humidity: "); Serial.print(h); Serial.print(" %\t"); Serial.print("Temperature: "); Serial.print(t); Serial.println(" *C"); } }
4.Upload it into your Arduino board and open the serial monitor to observe the temperature and relative humidity information of the environment.