The NodeMCU R2 is a Wi-Fi development board based on the ESP8266 (ESP-12E module), featuring a CP2102 USB-to-UART bridge for reliable programming and debugging. It integrates GPIO, PWM, I2C, 1-Wire, and ADC on a single breadboard-friendly board, and can be programmed with the Arduino IDE or NodeMCU Lua firmware.

The R2 version improves on the original with a CP2102 USB chip (replacing CH341) for better driver compatibility, higher current support, and a slimmer form factor that fits directly on a standard breadboard.

Key Features

• ESP-12E Wi-Fi Module – ESP8266 with 6 extra GPIOs compared to the ESP-12
• CP2102 USB-to-UART – Reliable USB interface, no CH341 driver needed
• Arduino IDE Compatible – Program directly using the Arduino ecosystem
• NodeMCU Lua Firmware – Pre-flashed, ready to use out of the box
• Breadboard Friendly – Slim design fits standard breadboards
• Micro USB Power – 5 V power, programming, and debugging via micro USB
• GPIO Access – 2× 15-pin headers (2.54 mm) with GPIO, SPI, UART, ADC, and power pins
• Reset and Flash Buttons – On-board buttons for easy firmware flashing

Specifications

• Chip – ESP8266 (ESP-12E module)
• USB Bridge – CP2102
• Power – 5 V via micro USB
• Dimensions – 49 × 24.5 × 13 mm

Ideal For

• IoT and Wi-Fi connected projects
• Home automation and sensor networks
• Rapid prototyping with Arduino IDE or Lua
• Learning ESP8266 development

Resources

• NodeMCU DevKit – Hardware Schematics & PCB Layout (GitHub)
• NodeMCU Firmware Source Code (GitHub)
• NodeMCU Flasher – Windows Firmware Tool (GitHub)
• Flashing NodeMCU Firmware on Linux (Guide)
• CP210x USB-to-UART Bridge Drivers (Silicon Labs)