Desain Keyboard Dengan Output Suara Sebagai Alat Bantu Pengenalan Huruf Braille

Rahmadahni, Rizky Yunanta and Hendriawan, Akhmad and Akbar, Reesa (2011) Desain Keyboard Dengan Output Suara Sebagai Alat Bantu Pengenalan Huruf Braille. EEPIS Final Project.

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Abstract

Nowadays, many shortcomings in learning system of introducting Braille for blind people still occurs. One of them, is the need of a role of normal teacher to introduce the motives and alphabets of Braille in learning session. He/She obligates to show the precise motives and alphabets of Braille being touched by the patience. This, absolutely, helps and supports the patient to learn the Braille, since they are unable to do it independently. To overcome this problem, a new system which can replace the role of teacher has been made, that is by attaching the Braille to the keyboard, so that when users push the button microcontroller will read data voice in SD Card through the communication of SPI. The Microcontroller will process data voice from SD Card using PWM-DAC together with a filter to produce a voice signal. The use of PWM-DAC is very important since the voice data saved in SD Card is still in a digital format. SD Card is used to keep voice databases in *.WAV format. PWM (Pulse Width Modulation) with 8KHz, 8bit and mono, as a sampling frequency, is used to transform a digital voice to the analogue signal. Keyword : Braille, keyboard, microcontroller, SD Card, SPI, PWMDAC

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