Objective:

         To measure the amount of temperature and moisture content present in the atmosphere

Components Required

• Arduino Uno
• Temperature & Moisture Sensor (DHT-11)

Connection Diagram

Program

#include <DHT.h>

#define DHTtype DHT11

DHT dht(DHTpin, DHTtype);

uint8_t temperature, humid, DHTpin=5;

void setup()

{

Serial.begin(9600);

pinMode(DHTpin,INPUT);

dht.begin();

lcd.begin();

}

void loop()

{

temperature = dht.readTemperature();

humid= dht.readHumidity();

Serial.print(“Temperature Value is :”);

Serial.print(temperature);

Serial.print(“Humidity Value is :”);

Serial.print(humid);

Serial.println(“ppm”);

}

Working

         The Temperature sensor is nothing but a thermistor whose resistance changes in accordance with the temperature. The change in resistance varies the amount of current flow through it and there by the voltage also.

Output

Room Temperature : 28 C

Moisture Content : 30 ppm

Note : Install DHT11.h Library