NodeMCU V2.1 ESP8266 IoT Development Board

NodeMCU V2.1 ESP8266 IoT Development Board

The NodeMCU V2.1 is a refined iteration of the NodeMCU V2 platform, powered by the ESP8266 ESP-12E module with a CP2102 USB-to-UART bridge. It offers a compact design, reliable serial communication, and full compatibility with the ESP8266 ecosystem — making it an excellent choice for IoT prototyping, wireless sensor networks, and smart home projects.

Key Features

• Microcontroller: ESP8266 ESP-12E
• USB-to-UART: CP2102 (stable, low-latency serial communication)
• WiFi: 802.11 b/g/n (2.4 GHz) built-in
• Clock Speed: 80 MHz / 160 MHz
• Flash Memory: 4 MB
• GPIO Pins: 13 digital I/O (3.3V logic)
• Analog Input: 1 × ADC (0–1V)
• Operating Voltage: 3.3V (onboard regulator, 5V via USB)
• USB Connector: Micro USB
• Board Size: 49mm × 24mm (compact form factor)

V2.1 Highlights

• Improved PCB layout over original V2 for better signal integrity
• Uses CP2102 for reliable and stable USB-to-serial communication
• Breadboard-friendly narrow form factor

Ideal Applications

• WiFi sensor nodes (temperature, humidity, air quality)
• Home automation and smart switching
• MQTT-based IoT communication
• Web servers and REST API clients
• ESPHome / Home Assistant / Tasmota integrations

Programming & Compatibility

• Arduino IDE with ESP8266 board package
• Lua scripting via NodeMCU firmware
• MicroPython support
• Compatible with ESPHome, Tasmota, and Home Assistant

Package Includes

• 1 × NodeMCU V2.1 ESP8266 IoT Development Board