Here’s an extended cut of the video display (which is displaying an RGB Test Sequence).  Note that the current maximum throughput is approximately 12-13 frames per second due to the RS-232 baud rate bottleneck, but I’m looking for ways to speed up the data transfer without requiring a faster oscillator.:

The Processing 1.1 code:
VideoDisplay (includes the .pde file and the video used)

As I noted in the previous post, there was an error on the first revision of the board and a pull-up resistor on RA5 (pin 4 in the schematic above) was necessary.  I added the MCLR resistor to the board along with a couple of other modifications:

• Removed the extraneous capacitors, we only need one.
• Added a breakout for the one remaining I/O pin.
• Added a small perfboard to the PCB with +5V and ground lines.
• Relocated the resistors to make them much easier to solder.  I may use a SIL resistor array in the future.

I kept the LED locations exactly the same because, hey, if I put all of the time and effort into the 4 boards that I previously ordered, then I might as well keep the same form factor.  My scheme for the short-term is to create a 4×4 array of the 4 RGB LED Controller boards, which will give me a 20cmx20cm 8×8 RGB LED display.

Here are some pictures of the boards:

Here is the updated schematic and board (note, you can open the BRD and SCH files in Eagle Layout Editor):

• PIC16F628 4 RGB LED DR1r3 Eagle Board

And finally, here is an updated firmware that improves the PWM performance:

• 16F628 Serial 4 LED PWM – 4-bit exp DR1r8.c
• 16F628 Serial 4 LED PWM – 4-bit exp DR1r8.hex

I will make sure to post when I have the full array put together (I currently only have 12 of the 16 boards I need for the 4×4 array).