The control box serves a few purposes, but mainly allows you to change modes:
CLASSIC – MIDI notes are mapped to bulbs Cn-Bn mapped to bulbs 1-12, intensity of bulbs is fully on, sustain pedal holds notes of same time, clears all bulbs when released.
VELOCITY – same as Classic, but intensity of bulb is controlled by the velocity of the note played.
SCROLLING (shown in video) – in this mode, bulbs are lit up sequentially as more notes are played, with intensity of the bulb based on velocity of the note. Releasing the sustain pedal clears the bulbs.
AUTOMATIC – Slow moving algorithm that creates a changing visual display in random patterns.
I divided the steps up into three parts :
Hardware (1-3) – Light bulbs, sockets, mounting, etc.
Electronics (4-7) – Explanation of circuitry, how to control light bulb intensity (dimming), midi communication
Software (8-10) – Details into the Arduino firmware, using timers, interrupts and PWM to control the light bulb intensity.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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Interesting project, but the line voltage wiring is a disaster waiting to happen. If you build this, please use proper connectors and wiring. Ribbon cable, DB25 connectors, and printer cables are NOT rated for 120V…