Led Matrix 16 x 16 With Sound Reactivity, Powered By Usb Type C, Wled And Quinled Dig-Uno

This is my design for a minimalistic and clean 16 x 16 led matrix display with sound reactivity. It is designed to stand or to be hanged to a wall.

BOM:

• printed parts
• 16x16 WS2812B RGB Digital LED Panel Flexible e.g. https://www.aliexpress.com/item/1005005265507780.html (choose the 16x16 variant)
• latching or momentary (depends on what you want, see assembly instructions) 12 mm switch, e.g. https://www.aliexpress.com/item/32677568815.html
• mini 5V Usb Type C trigger board, e.g. https://www.aliexpress.com/item/1005005747801940.html (choose 5V)
• INMP441 digital microphone module, e.g. https://www.aliexpress.com/item/4001129197909.html 
• Quinled Dig-Uno with Esp32 https://quinled.info/pre-assembled-quinled-dig-uno/ (i use the diy variant), other Wled controllers should fit as well
• 8 6x3 mm round neodymium magnets, e.g. https://www.aliexpress.com/item/1005001991968667.html 
• Usb Type C power adapter/charger, e.g. https://www.aliexpress.com/item/1005005394292642.html
• Usb Type C cable, e.g. https://www.aliexpress.com/item/1005005058173952.html (i would choose 2 or 3 m)
• super glue

Printing instructions:

• print at least in PETG or better in ABS/ASA. The electronic components get quite warm so PLA would get soft and deform. Trust me, i tested it.
• if using ABS/ASA you'll probably need a brim (e.g. 3 mm) for corner adhesion
• print “Diffusor” in white. The diffusor is only 0.2 mm thick (for maximum brightness) so be sure you have a perfect first layer. You can of course try some translucent black filament, i didn't tested it.
• print “Separator” in black or any other opaque color for best matrix point separation
• the color of the other parts don't really matter

Assembly instructions:

1. Glue “Separator” into “Diffusor” with some drips of super glue. Take care of the correct orientation of “Separator”. The side with the gaps is the backside. The gaps are for the resistors on the matrix pcb.
2. Desolder the power injection cables (the one in the middle) off the led matrix pcb
3. Solder plus and minus of the output cable to plus and minus of the input cable and desolder the output data wire (see photo). It is for best even brightness and simple assembly
4. Solder the microphone module with around 3 cm wires to the Dig-Uno board as described here https://quinled.info/dig-uno-quad-microphone-guide/#digital-microphone
5. Glue “InnerBase” to “Frame”
6. Install the button, the Type C board and the Dig-Uno/Wled controller to “InnerBase”. 
   • The type c module needs to be glued. 
   • The Dig-Uno should friction fit
   • You can ether use a latching button as power button by interrupting the plus line from the type c module or you connect a momentary button to a input pin of the Dig-Uno to control Wled
7. Solder cables (should be self explanatory). 
8. Insert the led matrix, connect it to the controller
9. Install Wled in the sound reactive version (e.g. via https://install.wled.me or https://install.quinled.info ) and configure it
10. Do a test
11. Glue “Diffusor” (with glued “Separator” inside) to “Frame”. The led matrix doesn't need to be glued, but you can do it, to have it always correctly aligned
12. Glue the magnets to “InnerBase” and “Backside”. Mind the correct polarity.

Cad files are attached. Feel free to remix.