How can I tell what is programed in an Adruino UNO

Projects General Guidance
1

I have an Arduino board that was given to me and I would like to see what the code is written in it. Is there a way to see or print out the code?
Steve

2

in any meaningful sense, no.

3

There is no C++ code in the Arduino. It's been compiled to machine code. If you've never done assembly language programming, this will be difficult... It will be difficult even if you have done assembly language programming.

You may be able to read the bytes. Here's some information Google found:

AVR Basics: Reading (and writing) flash contents | Evil Mad Scientist Laboratories
Read & Write Flash Contents of Your Arduino or AVR Chip - Make:
Pocket AVR Programmer Hookup Guide - SparkFun Learn

If you can find a disassembler you can generate assembly language from the machine code (the bytes in the Arduino's flash). Or, you can manually determine the assembly code from the machine code. But, there's typically thousands of bytes and possibly thousands of instructions (with one or more bytes per instruction).

[u]ATmega Instruction Set[/u]