9_3 Fade Up Tone and Print the Variable

Fade Up Tone and Print the Variable

Code

The code in the editor below is ready to run! Plug Code Lab Mini 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.

Restore 12 14 18 24 30

Monitor Upload Your Code!

/* Fade up the tones on a speaker while 'printing' the variable value to the serial monitor*/ void setup(){ pinMode(2,OUTPUT); //speaker Serial.begin(9600); //get the serial monitor ready to receive data from your board } void loop(){ /*create a 'counter' variable starting at 40 and, as long as the variable is less than 1000, run the code between the curly braces, then increase the value of the 'i' variable by 1 */ for(int i = 40; i < 1000; i++){ tone(2,i); //use the value of 'i' to determine the tone playing on the speaker Serial.println(i); //'print' the value of the 'i' variable on the serial monitor delay(10); //wait 10 milliseconds (0.01 seconds) before running the 'for' loop again } //Once the 'for' loop has ended, the void loop will start over, resetting the i variable and running the 'for' loop again } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

 

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Compile errors:

Serial port monitor: Input: Send Close

 

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. How does that impact the sound?

Math question: How many times does the ‘for’ loop run each time the void loop(); runs? Hint: The condition of the ‘for’ loop will decide the highest number the variable can reach, and the starting value of the ‘for’ loop will decide the lowest value the variable can be.

Change the condition value in the ‘for’ loop. Try to predict what will happen before you actually upload your new code.