Constant Variable Beep Delays

Code

The code in the editor below is ready to run! Plug your Code Lab in to your computer's USB port with the cable and hit 'Upload Your Code!' to see what it does. Change something in the code, like a delay or pin number. Try to add something new to the program - it's yours to tinker with! You can always press the 'Restore' button to return the code to the working example.

/* Replace a beep delay with a variable */ int wait = 1000; //create a variable, named 'wait', with a type of 'int', which means it will be a whole number - no decimals //Variables can be named almost anything. Names can't start with numbers or use other keywords from the code, like 'void' void setup(){ pinMode(A5,OUTPUT); //speaker } void loop(){ tone(A5,500); //Play a tone of 500 hertz on the speaker delay(wait); //delay for an amount of time equal to wait. Here it is 1000 milliseconds (1 second) noTone(A5); //stop the tone from playing delay(wait); //delay for 'wait' amount of time } // (c) 2021 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

Walkthrough Video

Watch the video for a line-by-line explanation of how the example program works. Then you'll be ready to make some changes of your own!

Challenges

Can you complete the challenges? Change the code in your code editor above. Upload your code to see the effect when you're finished. Complete a challenge? Check it off the list!

Change the variable value just to the right of the equals sign where the variable is created above the void setup.

Change the name of the variable in all 3 places where it is used in the code.

Try to create a variable that goes in place of the tone value played on the speaker. Don’t forget to create the variable above void setup, then replace the hertz value number with the variable name in the void loop.

Concepts

These are the new code concepts covered in this example program. To become a great coder, read through these concepts to learn new vocabulary.

Quiz

If you're having trouble, try to run an experimental program or look at the example code to help you find the answer.

1. Which syntax ends the entire 'void loop' function?

semicolon ;
parentheses )
closing curly brace }

2. Which syntax ends a single code command?

semicolon ;
closing curly brace }
period .

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