The NodeMcu is an open-source firmware and development kit that helps you to Prototype your IOT product within a few Lua script lines. Features: Open-source Interactive Programmable Low cost Simple Smart WI-FI enabled Arduino-like hardware IO Advanced API for hardware IO, which can dramatically reduce the redundant work for configuring and manipulating hardware. Code like Arduino, but interactively in Lua script. Nodejs style network API Event-driven API for network applications, which facilitates developers writing code running on a 5mm*5mm sized MCU in Nodejs style. Greatly speed up your IOT application developing process. Lowest cost WI-FI Less than $2 WI-FI MCU ESP8266 integrated and easy to prototyping development kit. We provide the best platform for IOT application development at the lowest cost. Specification: The Development Kit based on ESP8266, integrates GPIO, PWM, IIC, 1-Wire and ADC all in one board. Power your development in the fastest way combination with NodeMCU Firmware! USB-TTL included, plug&play 10 GPIO, every GPIO can be PWM, I2C, 1-wire FCC CERTIFIED WI-FI module(Coming soon) PCB antenna Document Schematic&PCB, Source Code, API Documents