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    Hey, what's up, Guys! Akarsh here from CETech.

    This project of mine is going to help your life become easy and you are going to feel like a king after controlling appliances in your house by just giving a command to Alexa.

    The main thing behind this project is nothing but the functioning of two modules ESP8266 and Relay Module. Basically we are going to control our ESP8266 using Alexa.

    Towards the end of the article, we will be doing simple connections between the ESP8266 and relay module followed by the code for connecting and controlling ESP8266 with Alexa.

    Let's start with the fun now.

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    Looking at the Relay Module

    The Relay Module is a convenient board which can be used to control high voltage, high current loads such as lamps and AC load. It is designed to interface with a microcontroller such as Arduino, ESP8266 and etc. It comes with a LED to indicate the status of the relay. The relay modules generally have the following terminals:

    1. NC(Normally closed)=The normally closed configuration is used when you want the relay to be closed by default, meaning the current is flowing unless you send a signal from the Arduino to the relay module to open the circuit and stop the current

    2. NO(Normally Open)=The normally open configuration works the other way around: the relay is always open, so the circuit is broken unless you send a signal from the Arduino to close the circuit.

    3. Common pin=It is generally in the middle

    4 Input pins=It is the pin through which relay is connected to the controlling device.

    If not mentioned on the module we can find out the NC pin using a multimeter in continuity setting by connecting the common with the other terminal through multimeter probes if it creates a beep sound then the pin is NC.