Instructions:

Build a circuit that contains a buzzer, connected to D$1,$ a button, connected to D$0,$ and an HC$-$SR$04$ connected to D$2$

Create a Particle project, Lab $5.$

Add the HC$-$SR$04$ library and study its capabilities intently $($look in lib$/$ HC$\_$SR$04/$examples and lib$/$HC$\_$SR$04/$src$).$

The source code is just $51$ lines long, read it over

In that project, define a function, playlt$(),$ that will accept a String, and play that String $-$ representing a melody $($deets below$),$ unless someone is within $24$ inches of your loT device $($as detected by the HC$\_$SR$04$ library$)$

Define a variable, beatsPerMinute, and corresponding getter and setter functions. A beat is usually a quarter note, so the value of beatsPerMinute will determine the number of quarter notes per minute.

Create a web page with two forms $-$ the first will include a text field for beatsPerMinute, the second will play the indicated melody.

Melody Format:

A melody consists of one or more dash$-$delimited triplets. Each triplet has $3$ characters:

note $($C$,$D$,$E$,$F$,$G$,$A or B$)$

octave $(0-8$ inclusive$)$ and

duration $($E$,$ Q$,$ H$,$ W$,$ short for Eighth, Quarter, Half, and Whole$).$

For example, C$4$Q$-$E$5$H would play C$,$ on octave $4,$ for a quarter note, followed by E$,$ on octave $5,$ for a half note. In between notes, include a brief pause during which no sound is heard.

Requirements: Obviously, the project needs to function properly in order to get credit, but you will also be graded on the quality of your code.

Do not use built$-$in libraries to play the notes, only analogWrite$()$

Use functions as appropriate

Avoid hardcoding, to make your code as comprehensible as possible $($even something simple like int coldLED $=$ D$4$; and int buzzer $=$ A$5$; can make a difference$).$ Use functions where possible to clean up your code.

loop$()$ and setup$()$ should be no longer than about $25-30$ lines