STEM II is an assistive technology project, through which groups of 3-4 students work with a client to develop a technology that can improve their lives. My group consisting of Amith Chintalapati, Anush Shah, and Henry Liu developed a calculator accessible by the visually impaired.


Millions of people around the world suffer from visual impairment, and these patients (VIPs) typically have difficulty using technology that relies on visual displays on a daily basis. VIPs who are currently students especially have difficulty using classroom technologies, such as computers, instruments, or calculators.


The goal of this project is to design a calculator keypad for the visually impaired making use of braille inputs to allow for VIPs to access the functionalities of a scientific calculator without outside assistance.

In order to accomplish this goal a modular solution was developed, consisting of an accessible keyboard fabricated with 3D-Printed braille keys, and a Raspberry Pi equipped with the Wolfram API, as well as a text-to-speech script. This solution is able to handle scientific computations as inputted by the user, and return the answer through audible output. The device is small, lightweight, and easy for visually-impaired clients to use.

prototype image