Nodemcu V3 Esp8266 12e Module

🔹 NodeMCU V3 Development Board – ESP8266-12E WiFi Module

An all-in-one, breadboard-friendly development board based on the powerful ESP8266 WiFi SoC. The NodeMCU V3 combines a programmable microcontroller with built-in WiFi, making it the perfect choice for IoT projects, smart devices, and wireless sensor networks. It can be programmed via Arduino IDE, Lua, or MicroPython.

✅ Specifications:

• Core Chip: ESP8266 (ESP-12E Module)

• CPU: Tensilica L106 32-bit RISC

• Clock Speed: 80 MHz (typically, can be overclocked to 160MHz)

• WiFi: 802.11 b/g/n (2.4 GHz), supporting Station, SoftAP, and Station+SoftAP modes

• Flash Memory: 4MB (32 Mb)

• SRAM: ~50KB (User Available)

• Digital I/O Pins: 11 (D0-D10, all except D0 support PWM, I2C, and 1-wire)

• Analog Input: 1 (10-bit ADC on pin A0)

• UART: 1 (with hardware flow control pins)

• Operating Voltage: 3.3V (On-board regulator allows USB or 5V-12V external input)

• USB Interface: Micro-USB for power, programming, and serial communication

• PCB Antenna: Integrated

• Buttons: FLASH (Programming) & RST (Reset)

• LED: Built-in blue LED on GPIO2 (D4)

• Dimensions: ~ 58mm x 31mm

⚙️ Key Features:

• Integrated USB-Serial (CH340G/CP2102): Allows plug-and-play programming via Micro-USB cable (drivers may be required for CH340G).

• Rich GPIO: Most pins support multiple functions (I2C, SPI, PWM) via software multiplexing.

• Breadboard Compatible: Dual-row 0.1″ pitch headers for easy prototyping.

• Arduino IDE Compatible: Can be added as a board via Board Manager, enabling programming with familiar Arduino syntax and libraries.

• NodeMCU Lua Firmware: Originally designed to run Lua scripts, offering a different, high-level development approach.

• Low Cost & High Community Support: Massive ecosystem of tutorials, libraries, and projects.

📦 Typical Applications:

• IoT & Smart Home Devices: WiFi switches, sensors, weather stations, and controllers.

• Wireless Sensor Nodes: Battery-powered or plugged-in sensors reporting data to the cloud (e.g., MQTT).

• Web Servers & API Endpoints: Host simple web pages or REST APIs to control devices.

• IoT Prototyping: Fast proof-of-concept for connected products.

• Automation & Robotics: As a WiFi-enabled brain for DIY robots and automated systems.

🔧 Getting Started (Arduino IDE):

1. Install: In Arduino IDE, add board manager URL: http://arduino.esp8266.com/stable/package_esp8266com_index.json

2. Select Board: Tools → Board → NodeMCU 1.0 (ESP-12E Module)

3. Select Port: Choose the correct COM/USB port.

4. Upload Code: Write your sketch. Hold the FLASH button while clicking upload if it fails to enter programming mode automatically.

⚠️ Important Notes & Limitations:

• Logic Level: All GPIOs are 3.3V and are NOT 5V tolerant. Do not connect 5V outputs directly. Use level shifters for 5V sensors/ICs.

• ADC Range: The single analog input (A0) has a maximum input voltage of 1.0V (some boards may be configured for 3.3V). Use a voltage divider for higher voltages.

• Power Supply: For high-current peripherals (e.g., servos), use an external 3.3V power supply. The on-board regulator can overheat.

• Concurrent Tasks: The ESP8266 runs a WiFi stack alongside your code. Use non-blocking code and delays carefully to maintain network stability.

• Driver Requirement: The CH340G USB chip may require manual driver installation on Windows/Mac.