Micro controller based speaking system for deaf and dumb is designed to give the signs, which are preloaded in the device. It is a micro controller based device, which gives the alert sounds just by pressing the control buttons, which are given some predefined messages like asking for water, washroom etc., here the person can just press the control button which indicates the sign of water (example) then the device sounds the same with some output volume.   Micro controller is the heart of the device. It stores the data of the needs of the person. So that it can make use of the data stored whenever the person uses the device. This device helps the deaf and dumb people to announce their requirements. By this the person who is near can understand their need and help them. This saves the time to understand each other and ease in communication.   This device is designed to provide with a greater advantage producing voice based announcement for the user i.e. the user gets the voice which pronounces his need as and when it is required.  

The main features of this project are:  

1. Simple button based operation.
2. Voice based announcement of needs.

  This project provides learning’s on the following advancements:  

1. Characteristics of micro controller.
2. Voice circuit characteristics
3. Embedded C programming.
4. PCB design.

  The major building blocks of this project are:  

1. Regulated Power Supply
2. Voice circuit
3. Crystal oscillator
4. Control buttons
5. LED indicators
6. Micro controller
7. Reset button

  Software’s used:  

• PIC-C compiler for Embedded C programming.
• PIC kit 2 programmer for dumping code into Micro controller.
• Express SCH for Circuit design.

             

Block Diagram:

video: