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Is It possible to read the code from Arduino board

Before anwsering the question, let's see what happens when you click Upload button on Arduino IDE:

• You write a human-readable code using Arduino language (C/C++)
• Arduino IDE compiles your code into binary code. The binary code is NOT human-readable, and Arduino's MCU can understand it.
• Arduino IDE uploads the binary code to the Arduino board.

So, in the Arduino board, there is no human-readable code but binary code.

Now let's come back to the main question:

• Generally, the answer is no.
• Actually, It is possible to read the code from the Arduino board. However, it is NOT a human-readable code. It is just binary code. Of course, the binary code can be converted to human-readable code. However, The converted code is not the same as the code you wrote: the variable and function's names are not the same, The code flow is not the same... Furthermore, The process of converting the binary code to the human-readable is called reverse engineering. This process is very expensive.

Additional knowledge: Most of MCU has the read-protection option. If this option is enabled, you even cannot read the binary code from the MCU

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