Automate your home with 4$ !

You would like to have a domotic house  with little money? Here i'll show you how to do it.

First of all you'll need some sonoff module, these are All-in-one modules with a power supply, a relay and an esp8266; by default they come with a pre-installed firmware (that is actually not so bad) but we can flash some personalized code (using an FTDI chip) for using with mqtt or like i'll show here: with the Blynk app. 

Materials:

• Sonoff (Aliexpress - http://cur.lv/16j2jt)
• FTDI (Aliexpress - http://cur.lv/16j2jv)
• DHT22 (Aliexpress -  http://cur.lv/16j2k7) - This is a temperature sensor
• Some jumpers for the DHT module and the serial module

To start you'll need to install the Arduino IDE (i recomend to dowload the portable version for easy library modification -  http://cur.lv/16j2kp ); now you need to prepare the IDE, just simply follow the instuction that you find here https://github.com/arendst/Sonoff-Tasmota/wiki/Prerequisite.

When all is ready you need the software: You can use the tasmota (http://cur.lv/16j2l8) that work with mqtt, but i'll use my software that work with the blynk app, it's more simple: no mqtt broker, writing code, ecc. simply download it, install on the sonoff, clone my app on your blynk and it's done!

1. Download the firmware

https://github.com/regi18/Sonoff-Blynk

Remember to change the Wi-Fi credentials and the Auth token

2. Connect the serial adaptor to the sonoff

5. Flash the firmware

First you need to change some flash setting, go to tools and change:

• Board: "Generic esp8266 module"
• Flash Mode: "DOUT"
• Flash Size: 1M (no SPIFFS)
• Reset metod: "ck"
• Port: the right serial port

, leave the others settings as they are and upload.

4. Connect the DHT22 or the switch (not a button)

• For the DHT you simply put the VCC to 3.3v, the GND to GND, and the data pin to the GPIO 14
• For the switch you need to connect one pin to GPIO 14, add a pull-up resistor (20k Ohms is Ok) from the gpio to ground, and the other part of the switch to 3.3v

5. Make the blynk app

Since I can not share my app with you ('cause the energy) i'll show you how to make it; it's very simple!

1. For the DHT version, add two gauge or labeled value and connect it to V1, for Temperature, and V2 for humidity
2. Next add a button, then click on it and put the settings in this way: V0 pin, Mode: switch.

6. DONE!

I hope that this will be useful! Bye.