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Keeping track of everything going on in your program can be an uphill battle. The serial monitor is a way to listen to what's going on in your code by reporting back to the computer over the USB cable. In the Tinkercad Circuits simulator, the Serial Monitor can be found at the bottom of the Code panel and can also be used to graph variables as they change. Use the Serial Monitor to "talk" to the computer as a way to check if the Arduino code is doing what you intended. This can be very useful for solving problems with your code (called ‘serial debugging’).
