This program will show the output of the DHT22 (AM302) sensor on the serial monitor when interfaced with Arduino Uno.
Make the circuit diagram as per the following
DHT PIN Arduino Pin
1 +5v
2 7
3 NC
4 GND
Download the library DHT from the Arduino toolbar i.e.
Sketch-----> Manage Library------> serach DHT22------->DHT sensor library------> click on install button to get it installed into your system.
Source code
//Libraries
#include <DHT.h>;
//Constants
#define DHTPIN 7 // what pin we're connected to
#define DHTTYPE DHT22 // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino
//Variables
float hum; //Stores humidity value
float temp; //Stores temperature value
void setup()
{
Serial.begin(9600);
dht.begin();
}
void loop()
{
//Read data and store it to variables hum and temp
hum = dht.readHumidity();
temp= dht.readTemperature();
//Print temp and humidity values to serial monitor
Serial.print("Humidity: ");
Serial.print(hum);
Serial.print(" %, Temp: ");
Serial.print(temp);
Serial.println(" Celsius");
delay(1000); //Delay 1 sec
}
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