Button Doubles Tone

Use the ‘Parts List’ image along with the component cards in your box to correctly plug in the electronic hardware to your Maker Board. The colorful dots next to the legs of the components match up to the ports where that leg should go on Maker Board’s ports.

Code

The code in the editor below is ready to run! Plug in the electronic components just like the Parts List card above, connect Maker Board to your computer's USB port with the cable, and hit 'Upload Your Code!'. Tinker with the code and change something! If you get stuck, you can hit the 'Restore' button to make the code go back to the working example.

/* 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(2,INPUT_PULLUP); //button } void loop(){ tone(A5,pitch); //play a hertz value equal to 'pitch' on the speaker if(digitalRead(2)==LOW){ //If the button on port 2 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) 2019 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!

Can you calculate what the tone will be after you’ve pressed the button 3 times?

Add another button that divides the pitch by two when it is pressed. The code will look like pitch = pitch/2; . Try to use the pattern in the example code to find out how to make this addition.

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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