How to upload a sketch via Arduino Nano I have two Nano boards, but the first one seems the CH340 chipset was burn. :( ,


Nano v3, CH340 chipset but unable to identify after connect to my Mac using USB
Nano v3, FTDI chipset and in good condition
USB to Serial module, using FTDI chipset


I am trying to upload a sketch via a USB-to-Serial module OR another Nano board (or UNO board v3) to my CH340 Nano Board.

Question:


How to wire them up?
Is it need upload a "Arduino as ISP" first?
step-by-step tutorial or website talking about this ??
I presume you have boot loader on your Nano, so you can use your USB to serial, just wire (D0)TX->RX(USB), (D1)RX->TX(USB), GND-GND and supply power to the target Nano. You will need to reboot Nano just before the uploading the code. Uploading is same as usual.

Using other Arduino as ISP needs more wires as well as 2nd Arduino, so i would use above method.