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XXXL Seven Segment Display

by hudson, published

XXXL Seven Segment Display by hudson Nov 5, 2012

Description

An extra large seven segment display for a clock, a counter or anything that needs big numbers.

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4 digits * 7 segments * 4 LED/s segment == 112 LEDs.  I bought a bag of cheap red ones; adafruit sells high intensity ones for $5.60 / 25 LEDs that are probably better.

To drive them I'm using a Teensy++, $27 from adafruit or $20 from the NYCR vending machine.

The acrylic plates were in the junk bin at Resistor, but new they are about $13 from Canal Plastics.  The foam core was $2/sheet.  If you do all the layers in acrylic that would add up a bit.

Add some misc hardware from around the shop...  and that's it!
Do you have a good BOM and approx cost to build and drive this? 

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Instructions

Cut each layer (along with the "Edge") layer from acrylic. Cut the segments from clear or red acrylic and clue into place on the "mid" layer. Place 118 LEDs in the "jig" layer and solder the positives together to make a common anode display.

The five layer stack assembles with M5x25 bolts and can be hung from the two slots.

Software coming soon.
Do you have a good BOM and approx cost to build and drive this? 
4 digits * 7 segments * 4 LED/s segment == 112 LEDs.  I bought a bag of cheap red ones; adafruit sells high intensity ones for $5.60 / 25 LEDs that are probably better.

To drive them I'm using a Teensy++, $27 from adafruit or $20 from the NYCR vending machine.

The acrylic plates were in the junk bin at Resistor, but new they are about $13 from Canal Plastics.  The foam core was $2/sheet.  If you do all the layers in acrylic that would add up a bit.

Add some misc hardware from around the shop...  and that's it!
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