The Color Mixing Christmas Light Project

This is a second revision of the DIY pixels we’ve been selling for the past year or two.

Notable changes:

• Support for field addressing per SRM’s jumper code, which is discussed in further detail in the DIY Christmas DMX Section.
• Nifty white soldermask.  Good for reflecting LED light back toward the eyeball.

There was some decent interest in a completely through-hole design. Some folks wanted to build their own pixels but weren’t comfortable with surface mount components.

This board receives DMX through a pair of RJ45 connectors in parallel. A SN75176 translates the differential data into a single-ended signal that the PIC can process. 5 x 2N3904 transistors drive 5 banks of LEDs.  The intention was to drive red, green, blue, amber and white LEDs.

The LEDs are arrayed as follows:

R G B W A R
G B W A R G
B W A R G B
W A R G B W 
A R G B W A

Useful PDF Files:

• Bill of Materials
• Schematic
• Loading Diagram

I currently have about 70 of these boards for sale.  $3.50 each or 10 for $28.  Send an email to John AT response-box.com if you’re interested.

Sorry, all boards have been spoken for.  We can certainly order more if there’s interest.