Deej Volume Mixer

What is Deej?

Here is the github repository for details about the project.

Deej discord server, here you will find lot's of helpfull information.

About this model

I wanted to use the arduino nano to its full potential, so all 8 analog pins are connected to potentiometers. LEDs and potentiometers are connected in parallel and switches are used to disconnect 5 V to them, thus muting the channel. I wired mine in such a way, that turning off the master switch cuts power to all other switches (the one on the far left, but any of them can be used for this purpose). The body has 4 small holes on one side and 4 big holes on the other side. The small ones are for mounting screws to screw into a desk and the big ones are for a screwdriver to fit through so that you can actuall screw it in. Unfortunatelly it cannot be screwd it fully assembled, because potentiometers and the perfboard would interfere with the screwdriver. However this is not that big of a deal, since it can be easily assembled in place. Make sure to put the LED gound header and LED resistors one hole lower on the perfboard. On my board it interferes with the mounting point and screw, that is why that screw is missing.

What do you need?

• 8 switches

• 8 5 mmLEDs

• 8 potentiometers

• 8 potentiometer knobs

• 16 M3 heat set inserts

• 16 M3x6 screws (longer screws can be used as well, but verify that the holes are deep enough)

• some wire

• soldering skills

• arduino nano

• 30x70 mm perfboard

• some male headers

• resistors (1k for red, 4k7 for blue and 220 for green)

• socket for the arduino nano

• arduino nano

• USB cable to connect to computer

How to build?

Print one front plate, one back plate and one body. Print without supports. I printed mine in PETG, but PLA should be just fine. Insert M3 heat set inserts into the body and back plate to mount the PCB or perfboard with arduino. On the perfboard you need to put an arduino nano and resistors for each LED. Values I used are 1k for red, 4k7 for blue and 220 for green to get same brightness on all of them. Switches are then connected together on one side, the other side goes to coresponding LED and potentiometer. Make sure to put the LED gound header and LED resistors one hole lower on the perfboard. On my board it interferes with the mounting point and screw, that is why that screw is missing. Crimp dupont female connectors on the end of wires comming out of the front plate. You can of course just solder everything in place, the connectors and socket for the arduino nano is not needed, but with them it is much easier to take it apart, if needed.