The prototyping circuit board was mounted to the bottom of the wooden keyboard. Screws couldn't be found in the correct size so small wire brads (little nails) were used. Normally, nails wouldn't be used but they were the best available option. Screws would have been preferable.
All the buttons for a single octave were temporarily mounted. The correct colors were even selected. On-hand switches had to be used but they were all compatible with the arcade buttons.
Wires from the circuit board were trimmed and connectors were crimped onto the ends. Careful attention was given to the wire length to avoid unnecessary tangles in the wire. All of the common switch connections were daisy-chained together and connected to 3.3V from the Raspberry Pie.
This pattern of building a circuit board, wiring out to buttons, installing hardware and testing can be repeated for the next three octaves. Changes will be made to improve the process. A change needs to be made to the code since the notes also played when a button was released. This could be a matter of debouncing or simply checking that a button has been pressed for at least x milliseconds.
Downloads
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
This blog, including pictures and text, is copyright to Brian McEvoy.
Mounted circuit board
All the buttons for a single octave were temporarily mounted. The correct colors were even selected. On-hand switches had to be used but they were all compatible with the arcade buttons.
Switches and buttons
Wires from the circuit board were trimmed and connectors were crimped onto the ends. Careful attention was given to the wire length to avoid unnecessary tangles in the wire. All of the common switch connections were daisy-chained together and connected to 3.3V from the Raspberry Pie.
Buttons fully wired
This pattern of building a circuit board, wiring out to buttons, installing hardware and testing can be repeated for the next three octaves. Changes will be made to improve the process. A change needs to be made to the code since the notes also played when a button was released. This could be a matter of debouncing or simply checking that a button has been pressed for at least x milliseconds.
Buttons mounted in wood
Downloads
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
Disclaimer for http://24hourengineer.blogspot.com/
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2017-01-02 (Su)
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