Duke Wiki  logo
Child pages
  • Lightboard
Skip to end of metadata
Go to start of metadata

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.

NOTE

Thank you to all who have built a version of our design, the support and feedback has been overwhelming.  It has been a while since this project was executed.  We have received correspondence from several people recently saying a few of the links we refer are now discontinued.  In chasing down a few of these notices, we have found that most of the items are still available and unchanged but under different model numbers that reflect cosmetic packaging differences.  We encourage our community members to help.  When you find a dead link and research the current component, please edit this page with the current part. 

Prototype

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

Standard Fabrication Components
ItemQntyEst. Cost EachTotal CostLink
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 - 4-Hole 90-degree Joining Plate2  www.amazon.com/80-20-Series-4-Hole-Joining/dp/B001IA2LX0/
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  http://www.amazon.com/80-20-Inc-Series-Flanged/dp/B006ZCLWE0/
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 Support (18")2$17.75$35.50http://www.amazon.com/dp/B006YVZ4UU/
80/20 - 45 Degree 15 Series Support (12")2$15.40$30.80www.amazon.com/80-20-Series-1515-UL-Support/dp/B00OCWXSKG/
80/20 - Caster Mount4 $74.60www.amazon.com/dp/B00J0934RI/
80/20 - Casters4 $124.00http://www.amazon.com/dp/B006YVZ2IO/
80/20 - Inside Gusset4 $6.25 $25.00http://www.amazon.com/80-20-Series-4-HOLE-INSIDE/dp/B001IA12YE
80/20 - Pivot Arm2$7.00$14.00http://www.amazon.com/gp/product/B001IA2M3O
80/20 - Living Nub2$4.80$9.60http://www.amazon.com/gp/product/B001IA2M34
80/20 - 5/16 Button Head Bolts15 $.36$5.40http://www.amazon.com/80-20-Inc-Series-Flanged/dp/B006ZCLWE0/
80/20 15 Series 3355 Bolt Kit22$1.50$33.00http://www.amazon.com/80-20-Inc-Slide-In-Economy/dp/B006ZCLYVQ/

80/20 15 Series 3357 Bolt Kit

2$2.25$4.50http://www.amazon.com/80-20-Inc-Slide-In-Economy/dp/B006ZCM0CS/
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 Supply2$68.00$136.00http://www.amazon.com/dp/B00IHZ9ME0/
Terminal Block1$7.99$7.99http://www.amazon.com/dp/B0055HOK7C/
Fuse block2$2.25 www.amazon.com/Fuse-Block-Full-Molded-3AG/dp/B00E3X6MGQ/
5/16-18 Tap1$6.44$6.44www.amazon.com/Vermont-American-20270-Fractional-Bottoming/dp/B000I1NZJY/
Tap Wrench1$10.23$10.23http://www.amazon.com/Vermont-American-21914-Economy-through/dp/B000BQLW6Y
     
Total  
Custom Fabrication Components
****If you have no access to a 3D printer, simple versions of the mounting systems can be created from wood or plastic in any local fab shop. Dimensions and specs are provided below.
3/8 Low Iron Tempered Glass1$1026.89$1026.89Source Locally, freight shipping is cost prohibitive
LED Clip48  Link:  http://www.thingiverse.com/thing:379661
LED Dimmer Bracket1  Link:  http://www.thingiverse.com/thing:347864
Glass Standoffs8  Link:  http://www.thingiverse.com/thing:348064
Fuse Block and Cover1  Link:  http://www.thingiverse.com/thing:379691
Power Standoff1  Link:  http://www.thingiverse.com/thing:348049
Terminal Standoff1  Link: 

Optional

Electronic Mirroring System1$600$600http://www.ensembledesigns.com/products/brighteye/be72
Mirroring System Mount1  Link:

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

Construction Of The Frame

InstructionsDiagramExample PhotoExample PhotoExample Photo
 Construct left and right side frame by joining 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 
Add supports for left side of frame by joining 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  
Add 5 hole corner bracket to what will be the back side of the left and right frame   
Add rear bracing by first taping the bottom 24" 80/20 1515 section.  Add a pivot nub to 
Add 5 hole T-Joining plate to the bottom of the frame at the same location as the vertical 72" piece of 80/20 1515 
Add corner gusset to the middle and top of the frame near the centerline of the holes you had cut in the glass.  Subtract 3/4" for the center line of the 80/20 1515 crossbar we will be adding.  
With both the left and right side of the stand complete, join them together at the bottom with two pieces of 72" 80/20 1515 acting as crossbars.    
Attach 2x 45 degree 18" or 12" supports to the inside of the two frames and against the bottom, center crossbar.    
Insert 4x 5/16 T-Nuts into the remaining 2 72" 80/20 1515 crossbars, latter these will support the glass.  With the side containing the T-nuts facing forward, mounting them as cross bars to the structure.    
Tap the top crossbar and top of the right and left sides of frame.  Add a right angle connector.   
At this point you should have a completed frame.  Stop to check all connections and make sure everything is secure and tight   

If 3D Printing the various custom mounts and brackets we used, start printing from this list:

    
Attach the stand offs to the glass and insert a 2" 5/16-18 bolt and 5/16 fender washer on the outside.  We found it best secure them with super glue to they don't fall off during assembly. The insert of the stand off should be in the glass as to prevent metal on glass contact.  Standoffs may be sourced locally or custom stand offs easily fabricated from wood or plastic can be used.  If using the 3D printing portion of this project, the standoffs file is here:  http://www.thingiverse.com/thing:348064 
Lay the stand down and put soft material over the frame (such as a towel).  With several people helping, place the glass over the frame and secure it, making adjustments to the top cross bars as necessary. Bolt the glass to the frame, DO NOT OVER TIGHTEN
While stand is laying flat, attach casters and caster mounts to the bottom "corners" of the unit.  BE SURE TO LOCK THE WHEELS.  With everything attached, stand the unit up raising it evenly from the top corners. Be careful not to apply torsional force or twisting motions. 
Secure power supplies to the left or right side of the stand.  If using a 3D Printer you can download and manufacture the part:  http://www.thingiverse.com/thing:348049.  If you do not have access to a 3D Printer a block of wood can be easily cut and fabricated to the dimensions in the example photo.  The power supplies require two of these units, a lower and an upper.   
Secure the power terminal block to the frame near the power supply.  The power supply cables are short so a distance of no more than a few inches is suggested.  The printable file is here:  http://www.thingiverse.com/thing:379717, while something similar can be fashioned with traditional carpentry as well.    
Secure the 3D printed fuse block and fuse holders to the chassis.  It is of critical importance that none of the power leads can come in contact with the metal frame.  If you have no access to a 3D printer, a simple version of this mounting system can be created by using a wooden or plastic spacer of approximately the same dimensions.   
Mount the Dimmer Bracket to the frame.  Using heavy grade double stick tape, adhere the LED dimmers to the bracket. The Dimmer bracket can be fashioned out of a simple block of wood by a carpenter or if you have access to a 3D Printer you can use our design here:  http://www.thingiverse.com/thing:347864 

Using 16 gauge hookup wire, connect:

  • The power supply hot lead to the fuse holder using female spade connectors
  • Connect the hot output of the fuse holder to the power side of the terminal block
  • Connect the negative side of the power supplies to the terminal block
  • Connect a power lead to the power input of each dimmer
  • Connect a negative lead to the negative input of each dimmer
  • Connect a 12v 15 amp fuse to the fuse box
    
If using 3D printed components, manufacture a batch of LED Clips.  Slide clips onto glass.  LED strips can be inserted into the LED clips along the track lines.  Add strips for the length of each side.  It is possible to put LEDs along the bottom of the project but cleaning fluid drips can cause issues.  LED File:  http://www.thingiverse.com/thing:379659LED Clip.m4v
Connect the LED strips to one another at the corners with the LED connectors.    

 

Schematic For Studio Lightboard Glass

Studio Lightboard Power Consumption

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

 

 

Markers:

We've found that these liquid markers work best and are easiest to clean with a dry cloth (not paper towel): Sanford Wet Bright Sticks Wet-Erase Fluorescent Markers, Assorted Fluorescent Colors, 5-Pack

 

 

 

  • No labels