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#Introduction:- This is IoT based home automation project is done using low cost NodeMCU module, It uses relays and few simple components, four electrical devices can be controlled, Temperature and Humidity can be monitored. NodeMCU is low cost module is used here. The electrical devices can be controlled by the help of Google assistance and by the blynk android app. In contrast, Wireless system can be of great help for automation systems. With the advancement of wireless technologies such as Wi-Fi, Cloud networks in the recent past, Wireless systems are used every day and every where.

#Components used

1. Node MCU (Lolin)
2. DHT 11
3. LDR
4. Relay 6V
5. Resistance 330 Ohms
6. Transistor BC 547
7. L.E.D.
8. D.C. Jack
9. Diode IN 4007
10. General PCB Board
11. Wires
12. Adaptor 5V 2 Amps
13. Relay Connector

#FUNCTIONS OF BASIC COMPONENTS USED:

NODE MCU: NodeMCU is an open source development board and firmware based in the widely used ESP8266 -12E Wi-Fi module With its USB-TTL ,the nodeMCU board supports directly flashing from USB port. It combines features of WIFI accesspoint and station + microcontroller. These features   make the NodeMCU extremly powerful tool for Wi-Fi networking. It can be used as accesspoint and/or station, host a webserver or connect to internet to fetch or upload data.-In our project pins D1,D2,D7 and D8 are used to automate two lights and two fans respectively.Pin A0 is connected to LDR.D6 is connected to DHT11

DHT11: It is a sensor which is used to sense temperature and humidity of a particular area.

LDR: It is a Light Dependent Resistor used to sense the intensity of light.Here we are using a LDR which has a maximum value of 1024.

Relay: A relay is an electrally operated switch. Many relays use an Electromagnet to mechanically operate a switch. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.In our project we have used 6volt relays to control two lights and two fans respectively.

Transistor: A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. In our project we have used transistor BC547 whose base is connected to node mcu , emitter to ground and collector to Relay.

LED: In our project we have used Two LED’s one Red and one Yellow. When the circuit is on Red light glows and when we there is a online connection established between the server and circuit yellow led glows.

DC JACK: A DC connector (or DC plug, for one common type of connector) is an electrical connector for supplying direct current(DC) power.

Diode: Main functions. The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking it in the opposite direction (the reverse direction). In our circuit the positive pin of diodes are connected to Relay.

General PCB Board: In our circuit we have used PCB instead of Breadboard and we have soldered each and every connection to make the connections tight and Errorfree. It also makes it easier to carry.

Adaptor: An adaptor is used to connect to switch boards so that it can work on fans and lights directly.

Relay Connector: It is used to connect Relays

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