The project aim is to construct an intelligent system for continuous monitoring of a child.  Children missing and kidnapping has become common these days. This system automatically horns a buzzer alarm, if child tries to move out of the house.   RF Communication ranges in between 30 KHz to 300 GHz. RF communication works by creating electromagnetic waves at a source and being able to pick up those electromagnetic waves at a particular destination. These electromagnetic waves travel through the air at near the speed of light. The wavelength of an electromagnetic signal is inversely proportional to the frequency; the higher the frequency, the shorter the wavelength.   The main controlling device of the whole system is a Microcontroller. RF receiver, buzzer and LCD are interfaced to Microcontroller. RF transmitter is connected in such a way that it always transmits the data. The RF receiver gets the data and feeds it to the Microcontroller. The microcontroller processes the data and analyzes whether the chills is within the range or not. A buzzer alarm is horned, if child is not in the range allotted. Also, LCD is used to show visual alerts. The Microcontroller is loaded with an intelligent program written using embedded ‘C’ language.  

The objectives of the project include:

 

1. Alerts child missing.
2. Monitors child or a blind person.
3. Wireless transmission using RF.
4. A buzzer to give alerts.
5. Visual alerts using LCD.

    The major building blocks of this project are:

1. Regulated Power Supply
2. RF Transmitter
3. RF Receiver
4. Microcontroller
5. LED indicators
6. Buzzer with driver
7. LCD with driver
8. Crystal oscillator
9. Reset

    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 designing.

 

Block diagram:

   

video: