CH340G replace FT232RL
8 analog input ports: A0~A7
14 digital input/output ports: TX, RX, D2~D13
6 PWM ports: D3, D5, D6, D9, D10, D11
1 pair TTL level serial transceiver port RX/TX
Use Atmel Atmega328P-AU MCU
Bootloader
Support USB download and power supply
Support external 5V~12V DC power supply
Support 9V battery power supply
Support ISP download