> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/wokwi/wokwi-docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Interactive Debugger

> Use Wokwi's built-in interactive debugger to step through code, set breakpoints, inspect variables, and explore call stacks.

Wokwi has a built-in debugger that allows you to step through your code, inspect variables, and set breakpoints. The debugger is currently in beta, and is available for AVR microcontrollers: Arduino Uno, Arduino Nano, Arduino Mega, and the ATtiny85.

<Note>
  If you wish to debug other microcontrollers, such as the ESP32 or the Raspberry Pi Pico, you can use [Wokwi for VSCode](/vscode/getting-started), which has [integrated debugger support](/vscode/debugging).
</Note>

## Using the debugger

<Steps>
  <Step title="Start debugging">
    Click the menu button in the simulator toolbar, and select **Debug**.
  </Step>

  <Step title="Set breakpoints">
    Click on the left margin of the code editor to set breakpoints. The debugger will pause execution when the program reaches the breakpoint.
  </Step>

  <Step title="Control execution">
    Use the debug toolbar to control program execution.
  </Step>
</Steps>

When running in debug mode, you will see the debug toolbar above the code editor. The toolbar contains the following buttons:

* **Continue** - Continue running the program. If the program is paused at a breakpoint, the debugger will continue running until the next breakpoint.
* **Step over** - Step over the current line of code. If the current line is a function call, the debugger will step over the function call and stop at the next line of code.
* **Step into** - Step into the current line of code. If the current line is a function call, the debugger will step into the function and stop at the first line of the function.
* **Step out** - Step out of the current function.

## Debugging panes

The debugging panes appear when you pause the program (either manually, or at a breakpoint). You'll find the panes below the diagram, next to the [Serial Monitor](/guides/serial-monitor) pane.

### Call stack

The call stack shows the current function call stack. The top of the stack is the currently executing function. The bottom of the stack is the main function.

### Variables

The variables pane shows the current values of the variables in the current scope. The variables are grouped by scope: local variables and global variables (which also include register values).