UNO R3 Mega328P CH340 Development Board

Digital I / O Digital input / output, a total of 0 ~ 13.
Analog I / O Analog input / output, a total of 0 ~ 5.
Support the ISP download function.
The input voltage: when connected to the computer USB without external power supply, external power supply 5V ~ 9V DC voltage input.
Output voltage: 5 V dc output voltage and 3.3 V dc output voltage.
Using Atmel Atmega328 microprocessor controller
Controller: ATmega328P-AU USB to serial
Chip: CH340G
Input Voltage (recommended): 7-12V
Digital IO pins: 14 (of which 6 provide PWM output)
Analog input pins: 6 DC
Current per I/O Pin: 40 mA
USB Port: type B USB
Clock Speed: 16 MHz
Operating voltage: 5V
Input Voltage (limits): 6-20V