The KEYESTUDIO V4.0 Development Board offers a fully compatible alternative for Arduino UNO R3 projects, featuring an updated CP2102 USB serial chip for reliable connectivity. This microcontroller board is equipped with 14 digital input/output pins, including 6 that support PWM outputs, along with 6 analog inputs for versatile project applications. At its core, a 16 MHz quartz crystal ensures precise timing operations. The board includes essential components such as a USB connection, power jack, ICSP headers, and a reset button for convenient programming and operation. With 32 KB of flash memory powered by the ATMEGA328P-PU chip (0.5 KB reserved for bootloader), it provides ample storage for your code. The board can be powered either through the included USB cable connected to a computer or via an AC to DC adapter through the power jack. The distinctive yellow-black design features high-contrast yellow silk screen printing on a black mask, making pin labels clearly visible and easy to read during project development and troubleshooting.