Step #1: PrevNext
- Get some wood. I chose mahogany.
- Create a template for your 7-segment digit.
Step #2: PrevNext
- Use a scroll saw to cut the LED segments out of the wood.
- Use a plunge router to hollow out the back side of the wood.
- Stain the top side of the wood. I used a satin poly.
Step #5: PrevNext
- Get a few LEDs (I used blue 5mm).
- Drill holes in the edge of the plexiglass.
- Super-glue the LEDs into the holes.
Step #6: PrevNext
- Paint the back and edges of the LED segments with metallic paint.
- Sand the front of the LED segments. The scratches will diffuse the light.
- Apply some voltage.
Step #7: PrevNext
- Take 2 thin sheets of plexiglass and sandwich rice paper between them.
- Hot-glue the LED segments to the plexiglass.
- Solder wires to all of the LEDs.
- Hot-glue the plexiglass to the inside of the digits.
- Connect each of the LED segments to a ULN2003A, and a 74HC595 chip. See the schematic. I also added a 220ohm resistor per LED.
Step #8: PrevNext
- Connect the chips to an Arduino and use the time library to "ShiftOut" the time to the 74HC595s.
- Stand back (way back) and check the time.
- Put it up on your cubicle for all your fellow drones to admire!