Specification: Origin: Mainland China Product Description: High-current electrical equipment must be powered separately, otherwise it is easy to burn the board! ! ! The 3.3V output power on the board is close to zero. This pin is the V3 pin connected to CH340 Like NRF24L01 (the 3V3 power supply of the connected board is insufficient and cannot communicate) ESP8266, OLED and other modules are best to use expansion boards or connect to an additional 3.3V power supply. (Hereby explain!!!) The USB 3.0 USB interface of some computers will be filled with current, causing the power chip to burn out. Please use the USB2.0 interface for power supply and downloading programs! ! ! Product Material: Mixed Materials Product Size: 43.00x18.00x5.00mm/1.69x0.71x0.2inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. _x005f_x000D_ _x005f_x000D_ Included: _x005f_x000D_ 1*Atmega168 Development Board or 1*Atmega168 (Type-C Interface) Development Board or 1*Atmega328 Development Board or 1*Atmega328 (Type-C Interface) Development Board 1.Powerful Processing: Harness the full potential of embedded systems with our MCU Core Board, boasting formidable processing capabilities to handle complex computational tasks and control operations, perfect for a wide range of IoT applications. 2.Extensive Connectivity: Expand your project's horizons with our welding development board, offering a wealth of interfaces including digital I/O pins, analog input pins, UART, SPI, and I2C, facilitating easy connections with a variety of sensors, displays, peripherals, and expansion modules. 3.Compatible with Arduino: Seamlessly transition your compatible with Arduino projects with our controller compatible board's compatible with Arduino development environment, supporting compatible with Arduino programming language and tools, and offering the convenience of using existing compatible with Arduino libraries and sample codes. 4.Energy Efficient: Embrace sustainability with our low-power design of this PCB development board, which operates efficiently to extend battery life, making it ideal for applications requiring long-term, low-power consumption without compromising performance. 5.Robust Software Support: Jumpstart your development with our micro development board's rich software ecosystem, including official development toolchains, libraries, and sample codes, providing developers with the tools needed for rapid project development and debugging.