CH340 USB Driver, atmega328P main IC, bootload has been written to the board. CH340G Replace FT232RL 8 analog inputs ports:A0 - A7, 14 Digital input / output ports:TX,RX,D2 - D13, 6 PWM ports:D3, D5, D6, D9, D10, D11, 1 pairs of TTL level serial transceiver ports RX / TX Using / AU There is bootloader installed in it Support USB download and Power Support for external 5V - 12V DC power supply Support power supply by 9V battery Support ISP download Atmega328P-AU and Atmega328P- Chip is same function Note:This model uses CH340C serial port chip, LGT8F328P external 16M crystal oscillator version! ! ! Note that the driver chip needs to be installed, WIN10 or above comes with its own driver! ! ! On the premise of ensuring that the performance of for NANO and the main control chip ATMEGA328P-AU remain unchanged, we replaced the USB chip to improve the download speed and increase the stability in win7 and win8. Instructions: 1. Download the IDE 2. Download USB chip driver 3. Plug in the NANO development board and the driver be installed automatically. 4. Select the board for NANO in the die 5. Select the COM port. You can check this in My Computer. The port on your for development board just now 6. It is best to select the built-in routine program first and burn it into it. For ATMEGA328P CH340G improved electronic building block interactive media components without welding Due to different batches, the appearance, color of the product may be different, which does not affect the use. Colour:Blue Material:PCB Package Contents: 1 * Development Board(Welded) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.