ESP8266EX Fun With Relay Module, Home Assistant & MQTT

I was gonna write simple program, upload it to ESP8266, plug ESP8266 to relay and thing is gonna work. But things get complicated a little bit as you

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Description

Few months ago I found cheap ESP8266 with relay and ordered it without thinking.
It's price was 6 US dollars.
I thought that process of setup will be almost like plug and play.
I was gonna write simple program, upload it to ESP8266, plug ESP8266 to relay and thing is gonna work. But things get complicated a little bit as you will see.

Details

Here I'll show you how to program small ESP8266EX and fix cheap relay module.

If you just bought ESP8266 or NodeMCU and don't know what to do next, visit my Starting With NodeMCU - Blinking LED project.

I also recommend to watch video bellow about this project, I think it will be easier for you to follow.

Components

1 × ESP8266EX With Relay Module Buy on eBay: https://ebay.to/2Ud2CgT
1 × USB to TTL CP2102 Module Buy on eBay: https://ebay.to/3gYm3nE
1 × Breadboard Buy on eBay: https://ebay.to/3dFzqHi
1 × Wires Buy on eBay: https://ebay.to/2XzVOfr

Build Instructions

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1

Step 1

First, hello!

Check out all needed components and get them.
2

Step 2

Insert USB to TTL module in your PC and check if Windows/Linux recognize USB to TTL module. If not, download (for Windows) Silabs Direct Driver For USB to TTL.
3

Step 3

Connect all components according to this scheme.