Constant Four Note Piano Variables

Code

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/* 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) void setup(){ pinMode(2,OUTPUT); //speaker pinMode(10,INPUT_PULLUP); //button pinMode(11,INPUT_PULLUP); //button pinMode(12,INPUT_PULLUP); //button pinMode(13,INPUT_PULLUP); //button } void loop(){ if(digitalRead(10)==LOW){ //if button 10 is pressed... tone(2,lowNote); //play the hertz value that is equal to the 'lowNote' variable } else if(digitalRead(11)==LOW){ //if button 11 is pressed... tone(2,lowNote*2); //play DOUBLE the hertz value that is equal to lowNote } else if(digitalRead(12)==LOW){ //if button 12 is pressed... tone(2,lowNote*3); //play TRIPLE the hertz value equal to lowNote } else if(digitalRead(13)==LOW){ //if button 13 is pressed... tone(2,lowNote*4); //play QUADRUPLE the hertz value equal to lowNote } else{ //otherwise, if no buttons are pressed... noTone(2); //turn off the speaker } } // (c) 2023 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense

Walkthrough Video

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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

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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?

semicolon ;
parentheses )
closing curly brace }

2. Which syntax ends a single code command?

semicolon ;
closing curly brace }
period .

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