21-09-2012, 04:53 PM
OFFICE MONITORING SYSTEM
OFFICE MONITORING SYSTEM.pptx (Size: 631.68 KB / Downloads: 55)
PROJECT DESCRIPTION
This system can be used in offices or hotels to call an one of seven attendant from different places.
The circuit provides an audio indication of the calling location to the attendant on a speaker, and video indication through a seven segment display.
This circuit has the tendency of conflict resolution by assigning priority to the callers. There will be no conflict when more then one caller presses the switch simultaneously.
COMP0NENTS LIST
Step Down Transformer(230V,50Hz to 9V-0-9V)
Voltage Regulator(IC 7805)
8-Bit Priority Encoder(IC CD4532)
Shift Register(IC 74LS96)
BCD to 7- segment decoder
Triple input OR-gate(IC CD4075)
7- segment display(LT S542)
Melody Generator(UM 66)
A Speaker, diodes, capacitors, resistances and transistors.
POWER SUPPLY SECTION
In this section ,the 230V,50Hz mains is stepped down by transformer X1 to deliver a secondary output of 9V-0-9V,500mA.
The secondary output of X1 is rectified by a full wave rectifier comprising diodes D1 and D2.
It is filtered by capacitor c1 and regulated by IC 7805.
The regulated 5V is obtained as its output, which is used to power the circuit.
INPUT LOGGING SECTION
Switches S1 through S7 are interfaced as input to the system through IC4532.
For loading the input data through switches to the IC2,enable interrupt pin 5 of the IC 2 must be high.
NOTE:-
All the inputs are prioritized using a priority encoder. So an input with high magnitude has higher priority.
REGISTER AND CONTROL SECTION
A shift register is used to store the encoder’s binary output.
A reset button is used to reset the value stored in shift register to zero.
For controlling the input data, a three –input OR gate is used.
The high output of the OR gate is used to enable the seven –segment display and speaker.
DISPLAY AND MELODY SECTION
A seven-segment display LTS542 is used to display the number of attendant to be called.
When the input of the melody generator (IC UM66) is high it generates a melody.
The output of melody generator (IC UM66) is used to drive the loudspeaker.
FUTURE DEVELOPMENT
A communication system (audio, video and message passing etc) can be added to the system for the caller to interact with the person being called.
This system can even be upgraded to make an centrally controlled intercom like communication channel between various colleagues in an office.
An extra button here can be used as emergency button to give message to everyone in the office.
OFFICE MONITORING SYSTEM.pptx (Size: 631.68 KB / Downloads: 55)
PROJECT DESCRIPTION
This system can be used in offices or hotels to call an one of seven attendant from different places.
The circuit provides an audio indication of the calling location to the attendant on a speaker, and video indication through a seven segment display.
This circuit has the tendency of conflict resolution by assigning priority to the callers. There will be no conflict when more then one caller presses the switch simultaneously.
COMP0NENTS LIST
Step Down Transformer(230V,50Hz to 9V-0-9V)
Voltage Regulator(IC 7805)
8-Bit Priority Encoder(IC CD4532)
Shift Register(IC 74LS96)
BCD to 7- segment decoder
Triple input OR-gate(IC CD4075)
7- segment display(LT S542)
Melody Generator(UM 66)
A Speaker, diodes, capacitors, resistances and transistors.
POWER SUPPLY SECTION
In this section ,the 230V,50Hz mains is stepped down by transformer X1 to deliver a secondary output of 9V-0-9V,500mA.
The secondary output of X1 is rectified by a full wave rectifier comprising diodes D1 and D2.
It is filtered by capacitor c1 and regulated by IC 7805.
The regulated 5V is obtained as its output, which is used to power the circuit.
INPUT LOGGING SECTION
Switches S1 through S7 are interfaced as input to the system through IC4532.
For loading the input data through switches to the IC2,enable interrupt pin 5 of the IC 2 must be high.
NOTE:-
All the inputs are prioritized using a priority encoder. So an input with high magnitude has higher priority.
REGISTER AND CONTROL SECTION
A shift register is used to store the encoder’s binary output.
A reset button is used to reset the value stored in shift register to zero.
For controlling the input data, a three –input OR gate is used.
The high output of the OR gate is used to enable the seven –segment display and speaker.
DISPLAY AND MELODY SECTION
A seven-segment display LTS542 is used to display the number of attendant to be called.
When the input of the melody generator (IC UM66) is high it generates a melody.
The output of melody generator (IC UM66) is used to drive the loudspeaker.
FUTURE DEVELOPMENT
A communication system (audio, video and message passing etc) can be added to the system for the caller to interact with the person being called.
This system can even be upgraded to make an centrally controlled intercom like communication channel between various colleagues in an office.
An extra button here can be used as emergency button to give message to everyone in the office.