The purpose of this project is an Assistive Technology that aids blind people in the process of learning the Roman alphabet, letter by letter in order to make their own signature. Using Arduino microcontroller, the actual system is formed by two plaques. The first is for data input, which represents a letter based on Braille alphabet and a second one is for the tactil stimulation, activating the viber units that constitute the character informed, already converted to the Roman alphabet. The Project has been developed with a partnership of a center that gives support to blind people.