The project aims in designing a system which helps the paralyzed people to express their basic needs. This system makes use of movements of tongue to announce their basic needs like food, water, etc..,. A magnet is placed on the tongue of the paralyzed and he need to move his tongue towards the Hall Effect sensor which senses the presence of magnet near it.   The magnetic sensors are nothing but hall-effect sensors. A Hall Effect sensor is a transducer that varies its output voltage in response to changes in magnetic field. In its simplest form, the sensor operates as an analogue transducer, directly returning a voltage. With a known magnetic field, its distance from the Hall plate can be determined.   The control system consists of Hall Effect sensor and microcontroller. Microcontroller collects data from the sensor and announces appropriate announcement for that data (tongue movement) through voice circuit interfaced to it. This operation is done by the Microcontroller which is loaded with an intelligent program written using embedded ‘C’ language.  

The main objectives of the project are:

1. To design a system useful for paralyzed.
2. Simple tongue-based system for expressing basic needs.
3. Announcement of needs through voice.

  The project provides exposure to the following technologies:

1. Characteristics of Hall effect sensors.
2. Voice circuit characteristics.
3. Interfacing of Hall Effect sensors and Voice circuit to Microcontroller.
4. Embedded ‘C’ programming concepts.
5. PCB Designing.

The major building blocks of this project are:

1. Regulated Power Supply
2. Hall Effect Sensors.
3. Micro Controller
4. Voice circuit.
5. Crystal
6. Reset
7. LED indicators.

  Software’s used:

1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Microcontroller.
3. Express SCH for Circuit design.

   

Block diagram:

video: