Rising Variable Tone

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.

/*Use a rising variable for the tone on a speaker*/ int pitch = 40; //Create a variable called 'pitch' that is an integer (whole number) and has a starting value of 40 void setup() { pinMode(A5,OUTPUT); //speaker } void loop() { tone(A5,pitch); //use the pitch variable as the hertz value playing on the speaker pitch++; //increase the value of the pitch variable by 1 delay(1000); //delay 1000 milliseconds (1 second) before starting the loop again } // (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 delay to change the speed of the tone rising. What happens if you make the delay very very small or delete it completely? Try to predict the outcome before you upload your program.

Change the starting value of the variable above the void setup().

Reverse the way the program works by setting the pitch variable to a high value above the void setup, then changing pitch++ to pitch-- in the void loop.

Try to set up the serial monitor and use the serial.println() function to display the variable value on the serial monitor. This is a tough challenge!

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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