How to install Library of 8266 in Arduino IDE

 

Step 1: Open Arduino IDE

Open ArduinoIDE, 

Open file 

 

Goto- the preferencesand then click Preferences and then paste http://arduino.esp8266.com/stable/package_esp8266com_index.json

in the Additional Boards Manager URLs option, click ok.

go to Tools menu

                                      

got to board - Board Manager

                               

EXP 5. Control and monitor the temperature of the elements using temperature sensor with NODEMCU

	#include "DHT.h"
	#define DHTPIN 4 // what digital pin the DHT22 is conected to
	#define DHTTYPE DHT22 // there are multiple kinds of DHT sensors
	DHT dht(DHTPIN, DHTTYPE);
	void setup() {
	Serial.begin(9600);
	Serial.setTimeout(2000);
	// Wait for serial to initialize.
	while(!Serial) { }
	dht.begin();
	Serial.println("Device Started");
	Serial.println("-------------------------------------");
	Serial.println("Running DHT!");
	Serial.println("-------------------------------------");
	}
	int timeSinceLastRead = 0;
	void loop() {
	// Report every 2 seconds.
	if(timeSinceLastRead > 2000) {
	// 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();
	// Read temperature as Celsius (the default)
	float t = dht.readTemperature();
	// Read temperature as Fahrenheit (isFahrenheit = true)
	float f = dht.readTemperature(true);
	// Check if any reads failed and exit early (to try again).
	if (isnan(h) || isnan(t) || isnan(f)) {
	Serial.println("Failed to read from DHT sensor!");
	timeSinceLastRead = 0;
	return;
	}
	// Compute heat index in Fahrenheit (the default)
	float hif = dht.computeHeatIndex(f, h);
	// Compute heat index in Celsius (isFahreheit = false)
	float hic = dht.computeHeatIndex(t, h, false);
	Serial.print("Humidity: ");
	Serial.print(h);
	Serial.print(" %\t");
	Serial.print("Temperature: ");
	Serial.print(t);
	Serial.print(" *C ");
	Serial.print(f);
	Serial.print(" *F\t");
	Serial.print("Heat index: ");
	Serial.print(hic);
	Serial.print(" *C ");
	Serial.print(hif);
	Serial.println(" *F");
	timeSinceLastRead = 0;
	}
	delay(100);
	timeSinceLastRead += 100;
	}