We know ESPresso Lite V2 is a powerful and good starter kit for IoT application. It can work as controller where we can program with custom applications. Nonetheless, for beginner, they still prefer to use Arduino Uno as a main controller. Plus, there have customers request on how to make ESPresso Lite V2 to work as a WiFi module and they only need to program Arduino Uno. One of the method is by installing the AT firmware into this board. So this tutorial will guide you step by step with proper photos, connection and simple IoT application.