GMU:PCB Arts/L.-E. Kühr/GOL-Midi: Difference between revisions

[[File:all_rules.png|800px]]

==Schematic==

To keep the controls simple, the only inputs used are two potentiometers and a button. for the LED matrix a preassebled 8x8 matrix with a MAX7219 controller are mounted through the back to make it shine through the PCB. Thus five holes have to be added for the five pins of the MAX7219 have to be added.

[[File:Schematic.PNG|800px]]

==PCB==

After a rough layout in PCBnew, I went to Inkscape, traced an old GameBoy and began to make outlines for the edge-cuts and silkscreen layer. After importing the general shape, I layouted all the mounting holes and pins and began to wire everything on the backside of the PCB. I left a window in the mask-layer, where the LED matrix is going to be mounted to and surrounded every component with a symbolic outline in the silkscreen-layer.

[[File:pcb_new.PNG|800px]]

===Generation===

To fill the general outline with texture, a 1-dimensional cellular automata was used with random inputs and the infamous rule 30. I upscaled the resulting texture and imported it into Inkscape. The texture was then masked to exclude the immediate surroundings of the components. It was then once used for the silkscreen (just around the screen) and once for the front copper for the rest of the PCB.

[[File:rule30.png|600px]]

==Final Design==

[[File:3d-back.png|800px]]

[[File:3d-front.png|800px]]

==Programming==

===MIDI===

To send the state of the simulation using MIDI the library MIDIUSB (https://github.com/arduino-libraries/MIDIUSB) was used. The state of the simulation is mapped to chrods of a selected scale that are hardcoded in memory and can be send all at once or as an arpeggio. To map to the scales the state of the automata is interpreted as an 8-Bit number that is then mapped to the tone. The speed or time of the interval is controlled by the shield.

==Parts==

* MAX7219 8x8 LED Matrix-Modul

* Arduino Micro

==Build==

[[File:ezgif-6-46dbab99ab2a.gif|360px]]

(GIFs, click to play)

==Usage==

* '''Hold Left & Hold Right''' (Longer than 500ms): '''Start/Stop playing'''

* '''Hold Left & Hold Right''' (Longer than 2000ms): Reset everything'''

==Demonstration==

{{#ev:youtube|7doCJ39owTw|735}}

==Further Reading:==