PowerPoint Presentation

Braille Reader DisplaySravan ParitalaAditiChaitanya AggrawalBackgroundCurrent Braille displays are expensive and are unaffordable for families or schools who may require them for blind/visually impaired children, students, and adultsBraille literacy is at an all time lowToo Expensive : around $5000Our project explores a less expensive, simpler alternative to offer some assistance with these low literacy rates.

Tactile feedback as the user moves 3Refreshable braille readers

Existing refreshable braille readers are very costly (around $5000)Basic design (in modules)Design was divided into three modules:1) Actuator (solenoid) with transistor circuit.2) Micro Controller and coding3) Physical Interface Transistor Circuit

Tony6Transistor CalculationsGiven that: 18 V solenoid operates off of 200 mAhFE is the current gain (beta) of the transistor

Selection of solenoidType: PushStroke length: 125Force: 6 OzResistance :45 OHMSOperating parameters : 12 V DC/26 ACompany: LADEX

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Selection of Micro ControllerArduino MicroController is chosen because of its simplicity in coding

Response time:

Details of arduino:

Please fill this alsoDevelopment ProcessJamelProgram Microcontroller then TestCycle through Alphabet with LEDs

Connect Microcontroller to Solenoids then TestDetermine if microcontrollers 5v output would be enough to lift solenoidsSince it was not, we built a switch using transistors in order to allow us to make use of a second larger power supply

Sketch CAD designProvide it to technician (Yanko) for implementation

Build as much as possible before presentation day

Cycle through the Braille alphabetExperiment with performance speedsAlign pen caps with solenoids

10Braille Specifications (probable estimate based on visit to blind school)

Dot base diameterDistance between two dots in the same cellDistance between two dots in adjacent cells

Dot heightTonys slide

Design specsBraille requirements dimensionsMinimize vibration (from Rob)Speeds sizeLateral motion (how braille is read)2:3 matrix instead of ASCII 2:4, to limit the number of dots needed when we build it

Tony11Summary of Visit to Blind School Please fill this up Morphology Write down the possible discussed designs such as single character by character / 20 in a row. Etc. Projected Prototype CostsPart ProductPriceSolenoid ActuatorsSolenoidsCircuitry Transistors, Resistors, Diodes, Breadboard, and Wiring MicroprocessorArduinoBatteries Casing MaterialPlastic (PVC)Adhesive MaterialGlueTotal