|
The control panel, i.e. the main control unit of the system
which consists of the primary control switches, pump
indicator, siren and level indicators. The visual example of
how switches And the indicators can be placed as shown the
figure below.
In the figure shown above there are total of nine LEDs, four
of which indicates the water level in the tank, another four
indicates the water level in the sump and one LED indicates
whether the pump is ON/OFF. It also consists of three
switches.
Switch 1
is the main power switch which is used to activate the system.
Switch 2
is used to select whether to operate the pump in AUTO or
MANUAL mode.
Switch 3
comes to picture only when the system is operated in MANUAL
mode. It controls the direct activation of the pump.
Description
:
This
system is built around an 8951 microcontroller and the circuit
diagram is as given below.
As you can see in the above diagram, port 0 is exclusively
used as an input port which takes the information regarding
the water level in the sump as well as in the overhead tank.
Port 1 is
used as output port which is connected to the indicator that
indicates the water level in both the tanks.
Port 2 is
used as in/out port, it takes the input from switch 2 and
switch 3 and gives the output which is connected to pump
indicator, siren and the relay which controls the switching of
the pump.
Working
of the system:
There are
two modes of working for the system
·
Manual mode
·
Auto mode
Which is
controlled by switch 2 (refer control panel diagram)
Manual
mode:
When
the system is active and in manual mode, it only indicates the
water levels in the tanks and it doesn’t control any working
of the pump. To activate the pump in manual mode switch 3 is
used.
In this
mode the operator should manually control the working of the
pump. As in case if the tank is full, operator should switch
of the pump which is not the case when compared to auto mode.
Auto mode:
When the
system is active and in auto mode, it only indicates the water
levels in the tanks and it controls the working of the pump.
For queries on the above please
contact
ranjith@electrofriends.com
|