Stealthburner Neopixel LED wiring using an LDO 2-piece Hartk PCB and breakout board

[DennisM]

Sorry if this has already been covered elsewhere, but I wanted to share my experience with my new Stealthburner setup for my Voron 2.4 and how I wired it up. Key points to mention:

• I didn't want to add new wiring into the cable chain (lots of work and I didn't even have the wires to use anyway)
• I tested the LEDs ahead of time with a WLED ESP32 controller to ensure my wiring and installation of the head part works (link to that topic)
• I have unused ports on the PCBs that I wanted to use to avoid new wiring.

Here's what I discovered going through this process:

• The docs recommend powering the LEDs from a 5V source, not the Octopus board
• Online folks talk about using the PB6 (BLTouch) pin vs. the PB0 RGB LED pin (center pin of the 3 pins)
• The PCBs use a common ground, which makes sense
• The Meanwell power supplies I used do not consider the case "V-", meaning you can't measure ground by connecting to the external metal case
• Most importantly, the 2 pin connectors for the X endstop and chamber thermister have one of the pins grounded (so you can't use both pins)

So to accomplish this, I used the X endstop and chamber thermister connectors, but only one pin from each (since the other is ground). The ports were free for me because my X-endstop is on the gantry itself, and the chamber thermister is mounted elsewhere and connected to the octopus on it's own (without the toolhead PCBs).

I just made an adapter cable with the RGB connector on one end, which splits into two different mini JST connectors. Note which pin I used for each. You can also just check continuity from ground to the pins to see which ones are grounded.

I was able to use PB0 myself. So here is the final wiring under the printer:

• One pin from the breakout board connector goes to 5V on the small power supply for the raspberry Pi
• Another pin from the breakout board connects to PB0 on the Octopus board (RGB connector).
• Ground is already connected so there's nothing to do there.

Hope this helps someone out there!

 

 

[claudermilk]

Now why didn't I think of that? I love the idea of repurposing the X endstop and chamber thermistor ports.