CH340 Nano 3.0 Development Board with USB cableCH340 Nano 3.0 microcontroller is based on untra-small open source Simple i/o platform, including a processor, ATmega328. It has 12 I\O ports ( 6 ports used as PWM output), 8 ports used as analog input, a pair of TTL level serial ports to receive and send, a usb, a ICSP heade and a reset button.Specification1. 14 digital input/output port , D2 ~ D13,2. 8 analog input port A0 ~ A73. A pair of TTL level serial port to send and receive , RX/TX4.6 PWM ports, D3, D5, D6, D9, D10, D115. Using Atmel Atmega328P - AU microcontroller6. Support USB download and power supply 7. Support external 3.3 V ~ 12 V dc power supply8. Support ISP download