Node MCU ESP8266 ( CH340 chip ):

 The NodeMCU is a popular development board based on the ESP8266 WiFi module. Here are the key details and features of the NodeMCU ESP8266:

1. Microcontroller: The NodeMCU is built around the ESP8266 WiFi module, which includes a Tensilica L106 32-bit microcontroller.

2. Clock Speed: The ESP8266 typically operates at 80 MHz, but it can be overclocked to 160 MHz for increased performance.

3. Memory: It has 4 MB of Flash memory for program storage. The RAM varies depending on the specific model but is typically around 80 KB.

4. Wireless Connectivity: The ESP8266 module provides built-in WiFi connectivity, allowing the NodeMCU to connect to wireless networks. It supports 802.11 b/g/n standards.

5. GPIO Pins: The NodeMCU has a number of General-Purpose Input/Output (GPIO) pins that can be used for digital input or output, as well as for supporting communication protocols such as I2C, SPI, and UART.

6. Analog Input: While the ESP8266 is primarily a digital device, the NodeMCU has a single analog input pin (A0), which can be used for simple analog measurements.

7. USB-to-Serial Interface: The NodeMCU includes a USB-to-Serial converter, making it easy to program the board using the Arduino IDE or other development environments.

8. Power Supply: The NodeMCU can be powered via USB or an external power source. It typically operates at 3.3V, and there are voltage regulators on the board to provide the required voltages.

9. Programming: The NodeMCU can be programmed using the Arduino IDE, Lua scripting language, or other programming environments that support the ESP8266.

10. NodeMCU Firmware: The NodeMCU comes with firmware that simplifies the process of working with the ESP8266, providing a higher-level interface for WiFi and other functionalities.

11. Integrated Development Environment (IDE): You can program the NodeMCU using the Arduino IDE, and there are specific board definitions and libraries available for working with the ESP8266.

12. Community Support: The NodeMCU has a strong and active community, making it easier for developers to find help, tutorials, and example projects.

13. Size and Form Factor: The NodeMCU has a compact form factor, making it suitable for various IoT (Internet of Things) applications and projects.