Arduino Nano schematic +

Using Arduino Project Guidance
1

Hi. Looking at the published schematic for the Nano, am I going nuts, or are the labels TX and RX connected to the UART lines of the USB controller reversed ? TX going to the RXD and RX going to the TXD of the chip.
Also, are the CPUs pre-programmed for Arduino use, or could I write Arduino code, then upload it to an (almost CPU only) board of my own ? All I need to run, is 2 ADC's and a WiFi module, with as small a volume as practical.

Thanks

2

Sorry, yes, I am going nuts. The labels, of course, refer to the CPU pins, not the serial controller pins !
My 2nd question still stands though.

3

Also, are the CPUs pre-programmed for Arduino use, or could I write Arduino code, then upload it to an (almost CPU only) board of my own ?

You need a chip with the bootloader programmed on it. You can either buy them like this or put it on yourself by using another Arduino. Look up stand alone Arduino.

4

sbkenn:
Q1) Hi. Looking at the published schematic for the Nano, am I going nuts,
Q2) or are the labels TX and RX connected to the UART lines of the USB controller reversed ? TX going to the RXD and RX going to the TXD of the chip.
Q3) Also, are the CPUs pre-programmed for Arduino use,
Q4) or could I write Arduino code, then upload it to an (almost CPU only) board of my own ? All I need to run, is 2 ADC's and a WiFi module, with as small a volume as practical.

Thanks

YES, the NANO is pre-ptogrammed with the boot loader, all set for use.
the IDE has a listing for it

if you have a clone, it has a CH340 chip and you will need a special driver.

5

http://kiguino.moos.io/2014/12/31/how-to-use-arduino-nano-mini-pro-with-CH340G-on-mac-osx-yosemite.html