Constant Four Note Piano Variables

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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.

/* Use variables to determine the notes on a four-note piano */ int lowNote = 200; //variable named 'lowNote' that is an integer (whole number, no decimals), with a value of 200 void setup(){ pinMode(A5,OUTPUT); //speaker pinMode(2,INPUT_PULLUP); //button pinMode(5,INPUT_PULLUP); //button pinMode(8,INPUT_PULLUP); //button pinMode(11,INPUT_PULLUP); //button } void loop(){ if(digitalRead(2)==LOW){ //if button 2 is pressed... tone(A5,lowNote); //play the hertz value that is equal to the 'lowNote' variable } else if(digitalRead(5)==LOW){ //if button 5 is pressed... tone(A5,lowNote*2); //play DOUBLE the hertz value that is equal to lowNote } else if(digitalRead(8)==LOW){ //if button 8 is pressed... tone(A5,lowNote*3); //play TRIPLE the hertz value equal to lowNote } else if(digitalRead(11)==LOW){ //if button 11 is pressed... tone(A5,lowNote*4); //play QUADRUPLE the hertz value equal to lowNote } else{ //otherwise, if no buttons are pressed... noTone(A5); //turn off the speaker } } // (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!

Change the value of the lowNote variable above the void setup. If you want your highest note to be 2000 hertz, what do you need to change lowNote to be equal to?

Change how much lowNote gets multiplied for each button press. For example, change lowNote*2 to lowNote*1.5 and get different pitch changes for each key.

‘Comment out’ the noTone function by placing two slashes (//) just to the left of the function. How does this change the piano?

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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