Led Bar Demo Board

Building, troubleshooting the Led Bar Demo Board.

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Where can I get a Led Bar Demo Board?
Ledbar_400.gifThe Led Bar Demo Board is part of the EPPO DIY-kit, it's an extra treat for all people out there who want to get started and experiment with it. Unfortunately, the Led Bar Demo Board can not be ordered separately. The photo on the left shows the second prototype of the Led Bar Demo Board, with components I used from my junkbox, so most components that come with the kit do not resemble anything like the components on this prototype. The leds, which are included in the Led Bar Demo Board, are probably yellow. You are ofcourse free to fit any other type of led you like, as long as you take into consideration, that the 4 current- limiting 330E resistors maybe have to be changed too. Depending on the software, or rather "firmware" you are going to use, you might go for a multiplexing aproach for the controlling of the leds. If you are, you must keep in mind that the intensity of the leds reduce quite a lot, so you have to change 330E into 100E or so. The circuitry of the Led Bar Demo Board is designed, so that you can control 12 leds with only 4 I/O pins, meaning that in fact only one lad can be illuminated at any given time. If you want more leds to appear illuminated at the same time you just have to multiplex.

How do I build a Led Bar Demo Board?
The Led Bar Demo Board buildingprocess, is documented quite extensively in the manual of the EPPO DIY-kit. Look in the manuals section of this site, you can probably find it there too in time...

Help! Some leds seem to be shorted somewhere!
Well, what can I say? Sometimes people make mistakes, such as this one. In the DIY-kit manual you should find a reference to a modification to be made before the components are to be fitted. Basically we have to cross two wires, and we do that with this modification:
LedbarPrecut_400.gif LedbarPostcut_400.gif
On the left you see the untouched PCB, where on the right you should be able to see two cuts, one between LED8 and LED9, and one between LED10 and LED11. We will make the cross on the solderside:
LedbarMod_400.gif LedbarPostcut2_400.gif
In the left picture you clearly see both wires. One has to be soldered between LED11 and LED10, and the other between LED11 and LED8. The photo on the right shows the cuts between the leds when they were made after the components had been placed.
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