Team 5 3D Braille Display - Michigan State University
TEAM 5 3D BRAILLE DISPLAY Sponsor: MSU Resource Center for Persons with Disabilities & Dr. Satish Udpa Facilitator: Dr. Tongtong Li Steven Chao Kodai Ishikawa Daniel Olbrys Terry Pharaon Michael Wang
Background Braille printers, 3D printed Braille, Braille displays Currently, there are no refreshable 3D displays for the blind Lack of resources for blind students
Some uses: 3D waveforms and curves, maps, pictures, etc. Problem Statement Develop a system able to: Receive image files Process said
images Output results via pin matrix display Design Specifications Understanding design parameters Providing explicit information about the requirements of the products Why the design is built this way Importance of design specification based on usage
Most important to lease important design specification Design Specifications Design Considerations: Pin Movement Push Up: Initially set down (reset down) During pin setting, must maintain set height Must be locked into place during use Pull Down: Initially set/reset up using springs
Pulled down by attached wires Will maintain set height, provides resistance to touch, fast refresh rate Difficult to coordinate individual rod control, very complex, not very robust Design Considerations: Pin Type Smooth Rods Must maintain set height, and needs a locking mechanism for use Easier to design and manufacture, variable pin height
Difficult to hold in place Notched Rods Notches will allow easier locking, with the downside of quantifying pin heights More difficult to design, but more effective with locking mechanism Design Considerations: Locking Mechanism Sliding Plate Easier to implement, but necessitates uniform locking
of pins More uniform distribution of locking resistance to each pin External Compression Series of panels with pins interspaced Hard to implement, but allows a row-by-row locking of the pins
Design Refreshable Display Z Axis pin mechanism X-Y Axes controlled by step motors, gears move pin mechanism into place to raise pin Smooth pins Pins held in place via friction Max height of one inch Controlled by Arduino
Receives processed image over USB and begins pin setting routine Current Progress Small array 4 x 4 Test different pin characteristics Material Shape
Single Pin actuator Step Motors End Semester Goals Large Array 64 x 64 pins Big enough for entire hand Parallel Operation Multiple Pin Actuators Increase speed of image creation More countable height levels Higher resolution More advanced images
Normalize image Convert pixel intensity into a corresponding height Send data to Arduino through serial USB Budget 3D Printed Components - $150 Step Motors - $100 Gears/Track - $40 Arduino Uno R3 - $30 Metal Pins - $30
Approximate Total: $350 Questions? Thank you for your time.
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