17-05-2014, 04:22 PM
AUTOMATIC ROOM LIGHT CONTROLLER
AUTOMATIC ROOM LIGHT.pptx (Size: 86.8 KB / Downloads: 143)
Functions of the controller
This controller performs the task of controlling the room lights as well as counting the number of persons in the room accurately
The total number of persons in the room is displayed on the seven segment display
When a person enters into the room , the counter is increased by 1 and the light glows
In the absence of person in the room , the light automatically goes off
IR Sensor
A pair of LEDs can be used as IR sensors.
The first IR LED is used to emit signals
The second one receives the input and transmits the signals.
When an object comes within the range of the emitted IR , it reflects the IR back to the receiving LED
Then a signal is produced from the IR.
Crystal Oscillator
It is an electronic circuit that uses the mechanical resonance of vibrating crystal of piezoelectric material
The material creates an electrical signal with a very precise frequency
Advantages and future development
It can be used in various rooms like seminar halls , where the capacity of the room is limited and should not be exceeded
It can be used in our homes because we often forget to switch off our room lights
It helps in energy conservation
In future , we can send this data to remote areas using mobile or internet
Voice alarm system can be used to indicate that room is full & person can’t enter inside