Arduino Uno SMD is a microcontroller board based on the ATmega328P microcontroller. It is similar to the original Arduino Uno board, but instead of through-hole components, it uses surface-mount components, which make it more compact and allow for easier automated assembly during production.
The board has 14 digital input/output pins, 6 analog input pins, a 16 MHz quartz crystal, a USB connection for programming and power, an ICSP header for direct programming, and a reset button. It also has a power jack, which can be used to power the board using an external power supply.
The board can be programmed using the Arduino software and language, which is based on C++. The Arduino Uno SMD is widely used in various DIY projects and can be used for a wide range of applications, including robotics, automation, sensing, and control.