Introduction: WIZnet W5500-EVB and Blynk App Communication

About: Embedded Firmware Engineer / Researcher. I'm Interested in IoT platforms and OpenSourceHardWare like arduino, Cloud, Web / App and product development.

Hello! Everyone.

Because app's are being used almost everywhere, I decided to make my own tutorial on how to control my board using App. Some time ago, I found a very interesting app platform, 'Blynk'. But Blynk platform supports only specified devices(like arduino series), so I've porting Blynk library for arduino to my WIZnet W5500-EVB board.

Blynk - build an app for your Arduino project in 5 minutes
Imagine a prototyping board on your smartphone where you drag and drop buttons, sliders, displays, graphs and other functional widgets. And in a matter of minutes these widgets can control Arduino and get data from it.

For more details, please refer to the Blynk official website,

Step 1: Parts

For this instructables, you'll need next things.

Step 2: Download Blynk App and Get the Auth Key Token in the App

You can download Blynk App from

Step 3: Download Simple Blynk Library for W5500-EVB

Firmware source code project released on GitHub repository.

Step 4: Set Your App's Auth Key to the Source Code

Set your App's Auth key to the source code - array Auth[] in main.c (32 bytes)

Step 5: Build the Project and Program to W5500-EVB

This project based on NXP LPCXpresso IDE.

Project Import to IDE, build and program to W5500-EVB

Refer to NXP MCU Flash programming guide:

Step 6: Open Blynk App and Add Widgets

Select the Hardware in Blynk app to Arduino UNO.

W5500-EVB is the Arduino pin-compatible board, It's possible to use pin 'D0 ~ D15' and 'A0 ~ A5'

So, please check the W5500-EVB Pinmap and then use the board.

Step 7: Run!

Enjoy it. Make your own remote controlled / monitor device using W5500-EVB and Blynk.


You have to use this example with (1) DHCP client code and Router(DHCP server) or (2) Public IP address.