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NodeMCU Mini is an ESP8266 WiFi micro controller at 80MHz and at 3.3V logic. This microcontroller contains a Tensilica chip core as well as a full WiFi stack. You can program the microcontroller using the Arduino IDE for an easy-to-run Internet of Things core or using the Lua script language. We had ship with NodeMCU 0.9.5 build 20150704 powered by Lua 5.1.4, so we can directly use the Lua language to DIY the IOT project. We wired up a high-quality SiLabs CP2104 USB-Serial chip that can upload code at a blistering 921600 baud for fast development time. It also has auto-reset so no noodling with pins and reset button pressings.