1. Pushbutton Piano using an Arduino Redboard
Designed by Jillian Holbert
Parts from Jameco & Sparkfun

2. Description 13 key pushbutton piano plays C4 - C5
6 switches allow transposing from C2 - C7
6 LEDs indicate which switches are on
Transposition goes up one ½ step using binary to count
Blue LED is MSB, Red LED is LSB
Arduino Redboard microcontroller programs notes to play
Interfaces with speaker and switches
LEDs are mechanical

3. Parts List 13 pushbuttons 6 switches 6 LEDs 19 330-ohm resistors
Arduino RedBoard microcontroller
Speaker
Headers/jumper pins/jumper wire

4. Transposition
In music, transposing a note one ½ step up means going from C4 to C#4 (C sharp)
Transposing a hole step is going from C4 to D4
Transposing an octave is going from C4 to C5

5. Truth Table / Binary Count for Notes
In HEX:
C2 starts at 01
C3 starts 0D
C4 starts 19 & 00
C5 starts 25
C6 starts 31

6. Truth Table Cont...

7. The Code If switch = 00 If switch = 01 then Then button 1 = C4
Button 3 = D4
Button 4 = D#4
Etc…
If switch = 01 then
Then button 1 = C2
Button 2 = C#2
Button 3 = D2
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8. Schematic

9. Switch
The pushbuttons are active low so the pins are attached at the voltage leg.
The switches are active high so the pins are attached at the ground leg.

10. Two Button Piano Getting the Switches to Work

11. Crazy Wiring

12. Finished Project

13. Lessons Learned Soldering Prototyping Designing
Tin individual components before soldering together
Play with the big blobs, they will move in your favor eventually
Prototyping
Designing
Working with an Arduino
Plans go awry
Take things one step at a time
Programming is hard, very hard