In this competitive world and busy
schedule human cannot spare time to perform his daily activities manually. The
most common thing that he forgets to do is switching OFF the lights wherever
they are not required. This project is a standalone automatic room light with
visitor counter. The main aim of the project is to control the lights in a room
depending upon lighting that is present in the room and count the number of
persons entering into the room. Use of embedded technology makes this closed
loop feedback control system efficient and reliable.
The system comprises of an IR
Transmitter-Receiver pair which is located in front of the door outside the
room.
LDR is placed outside the room and is used to identify whether it is day
or night time. Initially the light is switched off in the room. Whenever a
person tries to enter into the room, the receiver of IR pair identifies the
person. The microcontroller identifies
this change and starts counting the people entering into the room.
The light is switched off even
if anyone is present inside the room during the day time. Similarly, the light
is switched off if no one is there inside the room or if it is night times.
Thus, depending on the intensity of light and the surrounding temperature, the
required action is performed by the microcontroller. LCD displays the number of
persons entering into the room.
SOFTWARE AND HARDWARE TOOLS:
Software Tools:
- Keil compiler
- Orcad.
Hardware Tools:
- Microcontroller AT89S52.
- IR receiver and transmitter
- LDR
- LCD
- TRIAC and TRIAC driver