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HowTo: Ledtriks Led Panel
( Robert Jordan)
Step 13 : Trade off's
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| | This design has the same trade off's that all interlaced designs do. Since we are only turning the led’s on for 1/16 the time it takes much more current during that 1/16 to lit them up bright if system hung. Such as your computer locking up etc. the row its on could stay powered and since we are sending more current than the led’s operate on normally while it will not burn them out immediately it could shorten the life of the led’s. I have not had this happen but my computer is very reliable. This is the trade off. The ultimate fix is to add a watchdog circuit monitoring the clock signal and if the clock stops for very long pull the inhibit pin of the 74HC4514 high which would shut all drivers off, no current, no led’s can get cooked, but this was not in the scope of the project at this time. But something I will look into once I get the software where I want it.
The picture is just before I sprayed the whole back with the plastic coat. Notice the 6 cat5 cables along the bottom and the 2 along the side.
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