Overview
The NodeMCU ESP8266 is a compact microcontroller board with built-in Wi-Fi, based on the ESP8266 chip. It is ideal for IoT, smart home, robotics, and STEM learning projects. NodeMCU supports Lua scripting and Arduino IDE programming, making it beginner-friendly and highly versatile for embedded electronics.
Key Features
Microcontroller: ESP8266
Operating Voltage: 3.3 V (logic level)
Wi-Fi: 802.11 b/g/n, TCP/IP stack
USB Interface: Micro USB for programming and power
Memory: 32-bit microcontroller with flash memory
Compatible with Arduino IDE and NodeMCU Lua firmware
Breadboard-friendly with digital I/O and PWM
Supports I2C, SPI, UART, ADC interfaces
Technical Specifications
| Feature | Specification |
|---|---|
| Microcontroller | ESP8266 (Tensilica L106 32-bit) |
| Operating Voltage | 3.3 V |
| Input Voltage | 4.5–12 V via VIN pin |
| Digital I/O Pins | 11 (D0–D10, some multifunction) |
| PWM Channels | 10 |
| Analog Input Pins | 1 (ADC 0–1 V) |
| Flash Memory | 4 MB (common version) |
| SRAM | 80 KB |
| Clock Speed | 80 MHz (up to 160 MHz overclock possible) |
| Wi-Fi | 802.11 b/g/n, STA/AP/STA+AP modes |
| USB Interface | Micro USB for power and programming |
| Dimensions | ~48 × 25 mm |
Connectivity & Interfaces
Digital I/O: 0–3.3 V logic, GPIO pins D0–D10
UART (Serial): TX/RX for programming and communication
I2C: SDA/D1, SCL/D2
SPI: HSPI available on GPIO pins
ADC: Single-channel analog input (0–1 V)
PWM: Software PWM on multiple GPIOs
Applications
IoT projects with cloud connectivity
Smart home automation (lights, sensors, relays)
Wireless sensor monitoring
Robotics with Wi-Fi control
STEM labs for learning networking, sensors, and cloud integration
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