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Primer

This is an open hardware project based on the Michael Peshkin Lightboard from Northwestern University:

https://sites.google.com/site/northwesternlightboard/

Concept

A simple design that allows a lecturer presenting to a camera to write as they would on a white board but facing students.  This eliminates the need for complicated computer generated graphics. 

Differences between the Duke Lightboard and the original Peshkin Lightboard

The Duke Lightboard focuses on smaller, lighter construction the goal of eliminating the need for many studio accessories.  As a result, the design is somewhat portable and reduces the need for complicated lighting arrangements.  The three key technical elements are the use of an electronic "flipper" to mirror the video, the use of a custom designed LED clip, and the exclusive use of bolt-together 80/20 aluminum framing as opposed to a welded steel frame.  A project goal is also to create a design that is simple enough a lower level technician could build it.  It was also desirable to use common, easily sourced components for the construction.

The electronic flipper processes the reversed image as opposed to shooting the camera through an actual physical mirror as spec'ed in the original design.  This eliminates complication and geometry from the design as well as increasing the light input to the camera.  The LED Clip is also a key element.  The design holds cheap 3528 sized LED's on standard 8mm strips precisely up to the glass.  The design is extremely light and includes framing for a second LED strip that can illuminate the face of the lecturer without the need for industrial studio lighting.  The second Subject LED Strip is set to a warm 3000K temperature which is more appropriate for human skin.  The clip can be reproduced using simple extruding or 3D printing technologies.  The use of 80/20 components considerably reduces the weight of the final product while making it easier for someone who does not have access to a welder or other metal working equipment.

Design Evolution

The project progressed through two stages where a small prototype was built to test various concepts while providing an example instructional development teams could use in designing course concepts and material.

Prototype

Bill of Goods for Prototype (3'x2') Lightboard

Standard Fabrication Components
ItemQntyEst. Cost Link
80/20 - 24" 15 Series sections2  http://www.amazon.com/80-20-SERIES-T-SLOTTED-EXTRUSION/dp/B001F0F14E/
80/20 - 36" 15 Series sections4  http://www.amazon.com/80-20-SERIES-T-SLOTTED-EXTRUSION/dp/B00BL104NU/
80/20 - Inside Gusset4  http://www.amazon.com/80-20-Series-4-HOLE-INSIDE/dp/B001IA12YE
80/20 - 7-Hole Tee Joining Plate2  http://www.amazon.com/80-20-Series-5-HOLE-JOINING/dp/B001IA4PQ6/
80/20 - Leveling Feet4  http://www.amazon.com/80-20-Inc-Series-Leveling/dp/B006YVZ04A/
80/20 - Inside Corner Brackets4  http://www.amazon.com/80-20-Series-2-HOLE-BRACKET/dp/B001IA4Q7Y
80/20 - 5/16 Button Head Bolts30   
80/20 - 5/16 T-Nuts30   
60 watt power supply1  http://www.amazon.com/LEDwholesalers-Waterproof-Transformer-3-prong-3204/dp/B003WOIVRU/
8mm - 5m 6000K 3528 8mm LED Strip1  http://www.amazon.com/HitLights-Density-Flexible-Adapter-included/dp/B005ST2I9O/
8mm - 5m 3000K 3528 8mm LED Strip1  http://www.amazon.com/HitLights-White-Double-Density-Flexible/dp/B00710K0DE/
LED Strip Connector2  http://www.amazon.com/dp/B00JJ4SRSA/
Custom Fabrication Components
LED Clips24$5.99 http://www.thingiverse.com/thing:307144
1/4 Tempered Glass    
     
     
     

 

Bill of Goods for Desktop (6'x4') Lightboard

Standard Components
ItemQntyCost PerCost TotalLink
80/20 - 72" 15 Series sections6$40.11$240.66http://www.amazon.com/80-20-SERIES-T-SLOTTED-EXTRUSION/dp/B001F0I3FI
80/20 - 24" 15 Series sections2$14.67$29.34http://www.amazon.com/80-20-SERIES-T-SLOTTED-EXTRUSION/dp/B001F0F14E/
80/20 - 24" 15 Series sections2$21.03$42.06http://www.amazon.com/dp/B00BL104NU/
80/20 - 5-Hole Tee Joining Plate4 $31.20http://www.amazon.com/dp/B001IA4PQ6
80/20 Inside Corner Bracket2$2.95 http://www.amazon.com/dp/B001IA4Q7Y/
80/20 - 45 Degree 15 Series Support2 $47.00http://www.amazon.com/dp/B006YVZ4UU/
80/20 - Caster Mount4 $74.60www.amazon.com/dp/B00J0934RI/
80/20 - Casters4 $124.00http://www.amazon.com/dp/B006YVZ2IO/
8mm - 5m 6000K 3528 8mm LED Strip2$22.95$45.90http://www.amazon.com/dp/B005ST2I9O/
8mm - 5m 3000K 3528 8mm LED Strip2$22.95

$45.90

http://www.amazon.com/dp/B00710K0DE/
LED Clips24$5.99 http://www.thingiverse.com/thing:307144
Dimmer4$2.99$12.96http://www.amazon.com/dp/B003L4KKF2/
     
150 Watt DC Power Supply1$68.00$68.00http://www.amazon.com/dp/B00IHZ9ME0/
Terminal Block1$7.99$7.99http://www.amazon.com/dp/B0055HOK7C/
Total  
Custom Fabrication Components
3/8 Low Iron Tempered Glass1$1026.89$1026.89 
     
     
     
Fuse block2$2.25 www.amazon.com/Fuse-Block-Full-Molded-3AG/dp/B00E3X6MGQ/

Studio Lightboard Construction

80/20 Primer

This version of the Lightboard makes heavy use of 80/20 T-Slot extruded aluminum.  T-Slot uses special nuts slid into slots then tightened to make a joint.  Joint pieces come in a variety of shapes and sizes for various applications but the concept is the same.  The special nuts (called T nuts) in this project are either single, double, or triple length.  Note that using double and triple T-nuts where possible makes construction easier.  An example is demonstrated in the video below.

80:20.m4v

LED Clip Primer

This project uses specialized clips to hold the LED strips precisely to the glass and provide subject lighting for the presenting lecturer.  The clips are easily manufactured with 3D printing. The LED strips must then be inserted into the LED clip.  This is demonstrated in the video below.

LED Clip.m4v

Principle Construction

StepInstructionsDiagramExample Phot
  1.  Construct left and right side frame
Join 1x 72" 80/20 extrusion to 1x 80/20 24" extrusion with a 5-hole T-Joining Plate, build two of these T shaped structures 
2.  Add supports for left side frameJoin 1x 45 degree 15 series support to the T shaped structure created in step 1.  The 45 degree supports have their own joints built in  
3.  Join left and right upright frameJoin 1x 72" 80/20 extrusion to 1x 80/20 24" extrusion with a 5-hole T-Joining Plate, build two of these T shaped structures  

 

 

Studio Lightboard Power Consumption

Light ArrayPer LegArray Total
Top33.8 watts101.4 watts
Left21.75 watts65.25 watts
Right21.75 watts65.25 watts
Bottom  
Total231.9 watts

 

 

Cleaning Methodology

  • Wipe Lightboard clean with a traditional whiteboard eraser
  • White residual power from Lightboard with a clean, dry paper towel
  • Use a thin mixture of Dawn dish detergent in a spray bottle and mist the surface of the glass
  • Use a squeegee to wipe the cleaner off

 

 

 

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