The system should be pretty easy to set up with alternative components on a protoboard in the event that you don't want to make a PCB.

For information on the initial software setup for flashing the Trinket Pro refer to the Adafruit guide at https://learn.adafruit.com/introducing-pro-trinket/overview

The schematic is not the cleanest I've made, but I was in a hurry to get the board files out the door to get everything ready on time.

The low pass filters are set up in a Sallen-Key topology with the following components:

• R1 = R2 = 820 Ohm
• C1 = 0.068 uF
• C2 = 0.033 uF

The OLED data lines use 4k7 Ohm pullup resistors that are installed at R6 and R7 on the PCB. The OLED screen connector is rotated 180 degrees in the first PCB design file. This needs to be fixed in the future, but for now it is easy to fix in wiring.

The video doesn't have audio, but there are subtitles. Didn't have time to make a decent recording of the audio dub :/

The case can be 3D printed, although some modifications may be required based on any changes that are made to the design.

STL files are provided for printing directly and OpenSCAD files have been provided to make any modifications easier.