The NodeMCU V3 ESP8266 (CH340) is the world’s most popular open-source development board for Wi-Fi-based IoT projects. At Electrapac, we recommend this "V3" (Lolin) version for its larger, more stable footprint, which makes it perfect for secure mounting and easier access to GPIO pins during prototyping.

Product Overview

The NodeMCU V3 combines the powerful ESP-12E Wi-Fi module with the CH340G USB-to-Serial converter, allowing you to program it directly via a standard Micro-USB cable. It operates on the ESP8266EX SoC, featuring an integrated TCP/IP protocol stack. Whether you are building a smart home sensor or a web-controlled robot, this board provides a complete, self-contained Wi-Fi networking solution at an unbeatable price.

Key Features for Electrapac Customers

• Integrated Wi-Fi Antenna: Features a high-quality PCB trace antenna for reliable wireless communication throughout your home or office.

• Breadboard Friendly (Lolin V3): While wider than the V2, the V3 provides better mechanical stability and clearly labeled pins on both the top and bottom of the board.

• Plug-and-Play Coding: Fully compatible with the Arduino IDE, NodeMCU Lua, and MicroPython. Just plug it in, install the CH340 drivers, and start coding.

• Onboard Logic: Includes integrated Reset and Flash buttons, plus a programmable LED (connected to GPIO2) for quick status indications.

• IoT Ready: Native support for protocols like HTTP, MQTT, and WebSockets, making it the perfect choice for connecting to platforms like Blynk, Adafruit IO, or Home Assistant.

Wiring & Power Guide

When building your project with parts from www.electrapac.com, keep these power rules in mind:

1. 3.3V Logic: The ESP8266 pins are not 5V tolerant. Connecting a 5V signal directly to a data pin can damage the board.

2. Powering via Vin: You can power the board using a 5V–9V DC power supply via the Vin pin; the onboard regulator will safely convert it to 3.3V.

3. The ADC Pin (A0): Unlike the raw ESP8266 chip, the NodeMCU board includes a resistor divider, allowing you to read analog voltages from 0V to 3.3V.

Primary Applications

• Smart Home Automation: Control lights, fans, and appliances via a custom smartphone app or web dashboard.

• Environmental Monitoring: Build a Wi-Fi weather station that uploads temperature and humidity data to the cloud.

• Wireless Data Logging: Monitor industrial sensors remotely without the need for long, expensive cables.

• Web Servers: Host a simple HTML page directly on the ESP8266 to toggle GPIO pins from any browser on your network.

Why Shop at Electrapac?

We source our NodeMCU V3 Boards with original ESP-12E modules and high-quality voltage regulators to prevent "brownouts" during Wi-Fi transmission. At www.electrapac.com, we provide the wireless "brains" that turn standard electronics into smart, connected devices.