I plan on making some of these helper PCBs to speed up circuit connections when testing on breadboards.
Any suggestions on this simple design?
I plan on making both common Cathode and Anode versions.
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How about a DPDT slide sw on each channel to switch from Hi to LO true?
Thanks.
Trying to keep things small and pluggable into a bread board.
Having both common anode/cathode ’boards' let's the coder use HIGH or LOW logic turn on a led.
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Another thought, if you use the newer "high brightness" LEDs you might get away with only 1 or 2 Ma per channel, I've got some blue and white ones that are plenty bright enough (IMHO) with a 2k2 R at 5V.
Yes, some of those SMD LEDs are very bright 
and with larger dropping resistors you can keep current draw down to a minimum.
Will have to select appropriate resistor values as Vf is different for different colors. R/GN/BE/GN
Going to make a few of these boards in about an hour, I'll take a picture and show how they turned out.
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Turned out well.
Yellow used a 1K series resistor.
Blue used a 2.2K series resistor.
Green used a 430R series resistor.
Red used a 1K series resistor.
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If there are DIYers out there, here is a 1:1 PDF of the 8 LED version.
PDF Attached
Top.PDF (45.4 KB)
TopPositive.PDF (45.4 KB)
What size are the leds and resistors? 0603?
Size is 1206
Yellow 1K
Blue 2.2K
Green 430 ohm
Red 1K
White 4.7K
LarryD:
Size is 1206Yellow 1K
Blue 2.2K
Green 430 ohm
Red 1K
White 4.7K
Nuts. All I have are 0603 and 0402's.
Still, I'm going to download and perhaps on my next digikey order I'll go nuts with 1206 resistors.
BTW, I use a flush cut bit in a router to trim to the board outline.
See:
http://forum.arduino.cc/index.php?topic=349610.0
Decided to remove the left hand machine pin and use a header wire instead.
This way there would be less chance in shorting an output pin to the common lead.
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Thanks to Paul__B for the link.
Edit
Then there is this:
http://www.ebay.com/itm/Arduino-kit-Multicolor-6-Color-LED-Matrix-AVR-ARM-PIC-MCU-with-UNO-MEGA2560-code-/281738825922
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