LED Matrix Pendant
Jay Kickliter
Posts: 446
I'm working on a tiny SMD 8x8 LED pendant for a gift. Usually I use the Propeller, but decided to give SX a try since they are discontinuing them. It's a simple enough design that I can move to the Propeller if the SX doesn't work out.
Anyways, I'm attaching the schematic. Besides the missing support circuitry, should this work? Or is there something stopping me from all the pins to quickly run through a matrix by row and column?
The board should be about 1" w x 2" h. With a rechargeable 3.7 LiPol CR2450 on the back.
One last problem. I have such little room to work with, that I don't want to have a permanent header for the SX Blitz. Any ideas for an alternative? Maybe just 4 pads and apply pressure with the Blitz while programming.
Anyways, I'm attaching the schematic. Besides the missing support circuitry, should this work? Or is there something stopping me from all the pins to quickly run through a matrix by row and column?
The board should be about 1" w x 2" h. With a rechargeable 3.7 LiPol CR2450 on the back.
One last problem. I have such little room to work with, that I don't want to have a permanent header for the SX Blitz. Any ideas for an alternative? Maybe just 4 pads and apply pressure with the Blitz while programming.
pdf
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Comments
To program, you can get some pointed-end pogo pins that plug into the blitz socket. You can press these against pads on the board. Since they're spring-loaded, you'll get an even, reliable pressure, and the pointed ends will pierce any oxidation that there might be on the pads.
Take a look at the Ping))), if you have one, and you'll see a similar set of pads for programming its onboard SX.
Another option would be to position the pads near the edge and surface-solder a header in place, which can be removed after all programming and debugging.
-Phil
Post Edited (Phil Pilgrim (PhiPi)) : 11/21/2009 10:12:05 PM GMT
Yep. I've added pads (with holes) to boards that would normally take a 4-pin header and then just left the header out. I push the header into the SX-Key and then drop it into the pads -- a little bit of side pressure ensures good contact during the programming cycle.