Speaking aid for dumb - a simple project

ABSTRACT

      Speaking aid for dumb convert the gestures used by the dumb persons to sound. When a dumb person communicates using gestures, corresponding sounds will be heard through speaker. This will help the dumb people communicate with normal people who do not understand their gestures. LED-LDR networks are used for sensing the gestures. A flexible tube is placed between LED and LDR for passing the light. The LED-LDR network is placed on a glove worn by the dumb person. According to the finger bending, LDR resistance varies. The output of the sensor is converted to voltage and interfaced to   a LABVIEW through Arduino. The corresponding prerecorded sounds are played through loud speakers. This work produced sound for the gestures for the numbers 0 to 9 for which it was designed.

Purpose of motor drive

      Generally in industrial, commercial and utility applications electric motors are used to transform electrical energy into mechanical energy. The motors may be a part of mechanical systems such as mixer, conveyor, pump e.t.c. In many such cases, the speed of the system is determined by its mechanical design and loading. So, it is necessary to control the speed of motor for controlling the speed of system. The speed of motor is mainly controlled by using suitable electronic drive equipment, normally referred as variable speed drives. So the drives are used to

•   Increase the efficiency of a process
•   Provide accurate motor speed
•   Control motor torque
•   Enable the motor to run at a range of speeds
•   Automate and optimize a process                                                                                               

The above listed features help to improve the efficiency and quality of process run by motors.