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Firmware for ESP8266, NodeMCU, BlynkBoard, etc.

Prepare development environment

Install Arduino IDE
Install Blynk Library and restart Arduino IDE
Install ESP8266 core for Arduino
For Windows / OS X, you may need to install USB-Serial drivers according to your converter:

СP2102: https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx
FTDI (FT232, etc): http://www.ftdichip.com/Drivers/VCP.htm
TODO: Link to drivers for CH340 and PL2303.

If your board has a NeoPixel RGB LED, install Adafruit NeoPixel library from Library Manager

Build your Firmware

Open our example in Arduino IDE: File -> Examples -> Blynk -> Provisioning -> Blynk_ESP8266
Open Settings.h tab.
Configure your firmware:

BOARD_NAME - ...
BOARD_VENDOR - ...
PRODUCT_WIFI_SSID - ...

Upload firmare

Select your board type: Tools -> Board -> [Your Board]
Select your port: Tools -> Port -> [...]
Verify and Upload!

Note that for Blynk Board, you can select board type NodeMCU 1.0.