Nice job fixing the error! Your serial console is streaming and your red LED Is blinking
again.
The serial console will display any output generated by your code. Some sensors,
such as a humidity sensor or a thermistor, receive data and you can use print
statements to display that information. You can also use print statements for
troubleshooting, which is called "print debugging". Essentially, if your code isn't
working, and you want to know where it's failing, you can put print statements in
various places to see where it stops printing.
The serial console has many uses, and is an amazing tool overall for learning and
programming!
The REPL
The other feature of the serial connection is the Read-Evaluate-Print-Loop, or REPL.
The REPL allows you to enter individual lines of code and have them run immediately.
It's really handy if you're running into trouble with a particular program and can't
figure out why. It's interactive so it's great for testing new ideas.
Entering the REPL
To use the REPL, you first need to be connected to the serial console. Once that
connection has been established, you'll want to press CTRL+C.
If there is code running, in this case code measuring distance, it will stop and you'll
see Press any key to enter the REPL. Use CTRL-D to reload. Follow those
instructions, and press any key on your keyboard.
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