The Arduino UNO R3 Official board CH340G (DIP version) is a budget-friendly, ATmega328P-based microcontroller board (with a removable DIP chip) that uses the CH340G USB-to-serial converter instead of the official ATmega16U2. It operates at 5V, 16 MHz, with 14 Digital I/O, 6 Analog Input pins
Microcontroller: ATmega328P (DIP-28 package - socketed for easy replacement).
USB to Serial Converter: CH340G (requires CH340 drivers).
Operating Voltage: 5V.
Input Voltage (Recommended): 7-12V.
Input Voltage (Limits): 5-20V.
Digital I/O Pins: 14 (6 provide PWM output).
Analog Input Pins: 6.
Flash Memory: 32 KB (0.5 KB used by bootloader).
SRAM: 2 KB.
EEPROM: 1 KB.
Clock Speed: 16 MHz (usually via ceramic resonator).
DC Current per I/O Pin: 40 mA.