Download Embedded PIC Microcontroller Based Power Multimeter

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Traffic Light Lamp Blow
monitoring_Singapore
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BLOCK DIAGRAM
Alarm
Transistor
Driver
+5V
Power Supply
LCD
Display
Microcontroller
Board
Signal
Conditioning
Board
PT
CT
Relay
Drivers
Current
Lamp 1
Relays
for
Lamp
CT
CT
Dual Power Supply
Voltage
Current
Current
Lamp 2
Lamp 3
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Power Supply:
Generates +5V Power supply from the given 230VAC
Dual Power Supply:
Generates+12V and –12V DC power supply for opamp circuits
PT:
Potential transformer is used to sense the voltage
CT:
Current Transformer is used to sense the current.
Signal Conditioning Board:
Used to convert the sensed voltage and current into 0-5V DC and gives it to the
ADC of the PIC Micro controller.
PIC 16F877 Micro controller:
PIC 16F877 Micro controller is used as the CPU for processing the I/p and Output.
Relay Drivers:
A relay operates on +12V DC. But the Microcontroller delivers +5V TTL signal.
So this relay driver circuit is used to drive the relay using the +5V DC signal.
Relay:
Is a electromagnetic switch used to provide power supply to the motor through it.
Alarm driver:
A alarm operates on +12V DC. But the Microcontroller delivers +5V TTL signal.
So this relay driver circuit is used to drive the alarm using the +5V DC signal.
Alarm:
Used to give alarm sound when there is any fault condition (Over current, High
temperature etc)
LCD Display:
Used to display the output parameters like voltage current etc.
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Flow Chart
Start
B
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Get Data From Analog to Digital
Convertor
Compute average for every 20 scanned values
Check the Jumper
settings and set the
minimum power limit
Check whether
Total power is
below min power
limit
Disable buzzer Sound
Display All the values in the LCD
B
Enable Buzzer Sound