#ARDUINO NANO LED PINOUT SERIAL#

Notes about using Nano with HC-05 Bluetooth board Most other Arduinos are designed with a 10K pullup. This is a rather strong pullup at 1K compared to other Arduinos, but I see it is 1K on the official Nano, too. The resistor closest to the RX0 pin is the reset pullup.

#ARDUINO NANO LED PINOUT SERIAL#

The capacitor closest to the D2 pin is the DTR-to-RST capacitor used to reset on USB serial connection. These are arranged near the A3 and A4 pins. The remaining interesting things that may contain differences from the official Nano are on the bottom side of the board.īetween the RX and TX lines on the CH340G and the TX and RX lines of the Arduino header and ATmega328P chip there are 1K resistors, same as in the official Nano schematic. The RX and TX LEDs are active low, while the pin 13 and power LEDs are active high, just as on the official Nano. The RX and TX LEDs are not driven by separate pins on the USB chip as in the official Nano, but rather they are connected to the RX and TX pins of the ATmega328P. The CG340G has an external crystal and the Nano has unpopulated pads for capacitors related to the crystal. I have explored with an ohm meter and studied and annotated the board layout, and thought I would share for those of you who may be interested in hardware hacking or modifications. This design is different from the official Nano schematic, and I have not found a schematic for this CH340G version of the Nano.

The CG340G chip replaces the FTDI USB chip used on the officially-released and documented Arduino Nano. These are my notes about the Nano ATmega238P/CH340G that is popular on eBay.

Arduino nano led pinout