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LED Controller PCB

This repository contains a schematic and board layout for a WS2812B control board, based around the Adafruit Huzzah Breakout ESP8266 module.

The Eagle design files can be found in the design directory.

Parts List

Schematic Symbol Description Part Number
J1 5V 5A DC Barrel Jack Cliff DC10A / DC10L
J2 3.5mm pitch terminal block CamdenBoss CTBP3051/3
R1 150Ω Resistor 0805 SMD package
C1 3300µF Electrolytic Capacitor 7.5mm lead pitch
U$1 Adafruit Huzzah Breakout Adafruit product ID 2471

I recommend you use 2x10 female pin headers with 2.54mm pitch to allow you to remove the Adafruit Huzzah without de-soldering. Additionally, you may use 4x M2.5 screws to mount the PCB.

Schematic

Schematic

Layout

Layout

Gerbers

Pre-generated Gerber files are available in the gerbers directory. This will let you upload them to your preferred PCB fabricator to get a PCB made.

Software

For the software, please see the software repository.

License

Cern OHL v1.2. See LICENSE file.

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Contributors

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led-controller's Issues

Capacitor may not actually be required.

While initially designing this layout, I added a large capacitor to ease current demand on the power supply. This capacitor may not actually be needed if you are not doing a lot of animations on your LED strip.

What is the capacitor for?

The capacitor between +5v and GND performs two functions in this circuit.

  1. Filters noise from the power lines.
  2. Acts like a power reserve to prevent the power supply shutting down when the LEDs go from off to full brightness.

As I understand it, if you go from LEDs off to LEDs full brightness, the power supply sees this as a short circuit. So if you have a switching power supply it may just shut down. When using a capacitor, the current is drained from the capacitor first, slowly ramping up the drain from the power supply, so the change seems less drastic.

In my software, I plan to fade the LEDs in when turned on, so the demand should in theory be easier on the power supply.

Take the above with a pinch of salt, as I'm piecing together bits of infomation from different sources. If what I've said is patently wrong, then please feel free to reply below to help me understand!

Data line should be routed above the capacitor instead of below

In the first design of the board, I routed the data line below the capacitor. This has the disadvantage that it splits my top layer ground pour in half.

If I routed the data line above the capacitor then the ground plane would not be split as drastically.

This is not a huge issue, as the bottom layer has a nice large ground plane, but is still probably worth doing!

Capacitor footprint could be shrunk

The current PCB board uses a 7.5mm pitch capacitor, with 16mm diameter. As this project is low voltage, theres no real need for such a large pitch.

The capacitor could be swapped for a 5mm pitch 12mm diameter footprint. This would allow the board to be shrunk a little, and reduce filled board height 20mm.

Furthermore, you may not need a capacitor at all. See the discussion here.

DC holes should be routed rather than drilled

Currently the DC jack footprint is comprised of 3 drilled holes. This makes soldering a little tricky as the holes requie a lot of solder to fill.

Apparently the better method would be to actually route the holes to accommodate the rectangular pins of the Cliff DC-10A jack.

For more information read about slotted holes on the Autodesk Blog.

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