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Step 1: The Materials
Step 2: 1) the Materials- LED and Resistor
98 White LED
98 Resistor 470 ohm
I chose these resistors for this reason:
LED (ultrabrightness white) http://www.robot-italy.com/product_info.php?products_id=421 forward v is 3,3v and 25ma
,the clock will run to 9v and i want that the led will be drived at half current 12,5ma (no needs too much brightness), so:
(9-3,3)/0,0125= 456, correct misure is 470 ohm resistor.
Step 3: 2) the Materials -Standalone Arduino
-2 ceramic capacitor 22pF
-quartz 16 mhz
-2 elettrolitic capacitor 100 nF
-5v regolator voltage 78L05
Step 4: 3) the Materials - Integrated
4- ULN2003A Driver
ATMega 328 with bootloader
Step 5: 3) the Materials - Other Electronic Part
-a supply voltage coaxial connector
-a flat wire 26 wire with connector
Step 6: 4) the Materials - Remainder
-carboard light, color you want to make passpartout
-cartonboard thicker to make LED holder
Step 7: LED Soldering
Trip the anode and a side of resistor about 2-3 mm and sold it.
Step 8: Holes Guide
I've used a a drill with a bit of 5mm
IKEA frame with inside lucid paper with word printed through a laser print (four lucid together are need to have a solid color black).
Step 9: LED Holder Back
after you have soldered all the end of anodes that you see on the right. In each cathode word you will sold a wire that will go to a pin to driver the word with the Arduino sketch.
Step 10: LED Holder Front
Add some buffles to prevent the light from bleeding between words.
Step 11: Layers
Step 12: The PCB Board
I can send gerber file for a small fee.