IDUINO for maker’s life
User Manual
For
AM2302 DHT22 temperature and
humidity Sensor(ST1173)
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IDUINO for maker’s life
Pin
Description
Vcc
Power supply 5V/DC
Gnd
Ground
DAT
Digital signal pin
Description:
AM2302 digital temperature and humidity module is a digital output signal
containing a calibrated temperature and humidity combined sensor. It uses a
dedicated digital modules capture technology and the temperature and humidity
sensor technology to ensure that products with high reliability and excellent long-term
stability. Sensor includes a capacitive humidity sensing element and a high-precision
temperature measurement devices, and with a high-performance 8-bit
microcontroller connected. Therefore, the product has excellent quality, fast response,
anti-interference ability, high cost and other advantages. Ultra-small size, low power
consumption, signal transmission distance up to 20 meters. Making it the best choice
for all kinds of applications and even the most demanding applications.
Specification
Dimension: 40 x 23mm
Weight: 4g
Voltage: 5V
Port: digital two-way single bus
Temperature range: -40-80 °C ± 0.5 °C
Humidity: 20-90% RH ± 2% RH
Platform: Arduino, SCM
Need library: Adafruit DHT library
Pinout:
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IDUINO for maker’s life
Example:
Wire connection as below:
Vcc------------5V
Gnd------------Gnd
DAT-------------D2
***********Code Begin**********
#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT22 // DHT 22 (AM2302)
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");
}
}
***********Code End**********
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IDUINO for maker’s life
Library download:
https://github.com/adafruit/DHT-sensor-library
https://github.com/adafruit/Adafruit_Sensor
Reference:
https://learn.adafruit.com/dht
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