The 2007 Color Changing Christmas Light Project: Half a Pixel

[Prototypes - click to enlarge]

Half a pixel. Based on the original RGB design but with half the LEDs. 1.25" square.

The first version used all surface mount parts except for the voltage regulator and filter capacitors.

The current version is entirely SMT with the exception of the LEDs themselves.

Here's an image of the newest board:

[click to enlarge]

 

Schematic is Here [.pdf file]

 

Bill of Materials:

B1 Blue LED 5mm
B2 Blue LED 5mm
B3 Blue LED 5mm
C1 .1 uf 10v 0805
C4 1 uf 10v 0805
C5 10 uF 25v 0805l
E1 Red LED 5mm
E2 Red LED 5mm
E3 Red LED 5mm
G1 Green LED 5mm
G2 Green LED 5mm
G3 Green LED 5mm
JP1 Data / Power Header, .1" x 5
JP2 Data / Power Header, .1" x 5
PGM programming header, .1" x 5
R1 1K 0805
R2 1K 0805
R3 1K 0805
R4 1K 0805
R5 300 0805
R6 117 0805
R7 100 0805
T1 2N3904 SOT-23
T2 2N3904 SOT-23
T3 sN3904 SOT-23
U$1 78L05 SOT-89
U1 16F688 SOIC
U2 MAX485/SN75176 SOIC