HC-21 Simple Wifi Serial for Arduino Tutorial

The Simple Wi-Fi HC-21 module is a meager $10-$15 bucks on ebay right now. It is a simple Wi-Fi serial port server or virtual serial port. This means it is self contained and will handleimage all the overhead of negotiating a Wi-Fi connection and communication leaving more room for your application in the Arduino.

Here you can download all the documentation and programs I have acquired. HC-21Assets.Zip

If you are interested in the Modbus library I am running in the Arduino view This Post.