Button Doubles Tone

Code

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/* Pressing a button doubles the pitch of a speaker tone */ int pitch = 40; //create a variable named 'pitch' that is an integer (whole number) and starting value of 40 (where the speaker starts to sound good) void setup(){ pinMode(A5,OUTPUT); //speaker pinMode(8,INPUT_PULLUP); //button } void loop(){ tone(A5,pitch); //play a hertz value equal to 'pitch' on the speaker if(digitalRead(8)==LOW){ //If button 8 is pressed pitch=pitch*2; // Double the pitch variable. With no delays, pitch will rise quickly! delay(100); //a delay keeps the pitch from immediately going out of hearing range } if(pitch>10000){ //If pitch is greater than 10,000... pitch=40; //reset the variable to 40 so the scale can start 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!

Video Notes for Code Lab Users:

  • Your button is connected to port 8 instead of port 2 as the video says.

Challenges

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Concepts

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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?




2. Which syntax ends a single code command?