Description of the a-rduino nano module: The Mega328P AU module has a Type-C interface, which can be connected conveniently. 8 analog inputs: TX, RX, D2-D13 Chip: CH340. 6 PWM ports: D3, D5.D6.D9, D10, D11TTL level serial and reception port RX/TX. Supports USB-C and external DC5-12V power supply. Note: Before performing the procedure, please install the corresponding computer system driver. Driver: directly from the chip manufacturer: WCH-340 Product Homepage: http://www.wch.cn/download/CH341SER_LINUX_ZIP.html (Linux should also work without the driver) http://www.wch.cn/download/CH341SER_MAC_ZIP.html http://www.wch-ic.com/download/list.asp?id=127 (Windows) http://bit.ly/2pMF4in Mega328 Microcontroller: Microcontroller Mega328P-AU. Fully compatible with A-rduino Nano V3.0 Mega328P-AU Input voltage (recommended) 7V-12V; input voltage (limits) 6V-20V. Bootloader installed, ready to upload sketches from A-rduino software Analog input pins 8 Operating voltage: 5 V. DC current per I/O pin 40mA DC current for 3.3 V pin 50 mA. Digital I/O pins 14 (including 6 with PWM output) Flash memory 32 KB (Mega328), of which 2 KB is used by the bootloader. SRAM 2 KB. EEPROM 1KB Clock frequency: 16 MHz. Casing: 5 x A-rduino Nano Mega328P compatible with A-rduino.