25-09-2012, 11:58 AM
MICROCONTROLLER BASED LIFT SYSTEM
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ABSTRACT
This paper presents the microcontroller
based lift system using microcontroller chip AT89C52
based on messege scheduling which basically belongs to
data based system in which change in one operation is
visible to other concurrent operation ,in which user can
programme each set by entering no of series of text
date time etc in data base system which can be
performed on the priority basis.
INTRODUCTION
Conventional lift system based on
elevated control system which has no of disadvantages
as large no of cables ,risk factor,complicated,less
intelligent, uneconomical.But modern Distributed
elevated control system is in intelligent economical
system which provide all above reduced disadvantages.
3 recent innovations include permanent earth magnet
motors, machine room less, rail mounted gearless
machine aned microprocessor controls.
WORKING PRINCIPLE
Based on sensor and switch polling method
in which observation of changes made over
switches done by sensors through messege
scheduling.
COMPONENTS USED
microcontrollerAT89C52,5.5V,16MHZ,Pr
ocessed billions of instructions per cycle
per second
Motor driver chip L293D ,Intetfacing
between lift and
microcontroller,16pinIC runs on 5v dc.
Sensors and switches-reed type,.25w
power, 0-16 AT.
Crystal oscillator-11.059mhz for serial
communnication.
DC- Motor -1W, Rectifier-IN-4007
CIRCUIT OPERATION
Then regulator IC7805 sends the +5Volt supply to all
the circuits, which will start the system.
Automatic lift is designed by using microcontroller
AT89C52.220 Volt ac power is supplied to step down
transformer, which again supply 12Volt ac power to
rectifier through diode which convert the ac power
supply to dc power.
After the system is on, firstly it will check the position
of the lift,if the lift is on ground, then it will start the
motor due to which movement of lift is start Lift will
remain at standby mode until new switch is pressed
CONCLUSION
Plateform monitoring and controlled message
schedu- ling data base logic is successfully
performed with an elevator
Lift moved in upward and downword direction
with closing and opening of door at the desired
floor.
Thereby removing earlier Non-Linearity presents
between the arms arrangement due to sprocket
and chain mechanism.Thus sprocket and chain
mechanism are completely removed.