Water level indicator cum controller

The present concept implements controlling of pump which pumps water from the sump (underground tank) to the overhead tank, using 8951 microcontroller.
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.

Front view of the model

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.

1. Switch 1 is the main power switch which is used to activate the system.
2. Switch 2 is used to select whether to operate the pump in AUTO or MANUAL mode.
3. 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.

Circuit diagram of Water level indicator cum controller

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

1. Manual mode
2. 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
i am providing u code
********************************************************************************************
      ;Objective : Water Level Indicater and Motor Protection
      ;Name of the Programmer : Neeraj Kumar
      ;Hardware Used : CPU Board, Led Card, Power Supply, 8 pin connector
      ; Two pin connector
      ;Program Description ; Crystal=11.0592kHz
      ; Port0 is used as LCD
      ; Port1 is used for Motor
      ; Port2 is used for LED’s
      ; Port3 is used for RF Module

      ;Status :
      ;**********************Hardware declaration**************************************************;
      lcd equ p0
      RS BIT P2.5
      EN BIT P2.4
      buzzer bit p2.3

      GREEN bit p2.0
      YELLOW bit p2.1
      RED bit p2.2

      senser1 bit p3.0
      senser2 bit p3.1
      senser3 bit p3.2
      senser4 bit p3.3
      relay1 bit p1.0
      key1 bit p1.3

      ;*********************************************************************************************;
      ORG 0000H ;RESET OPERATION
      SJMP POWERON ;GO TO POWERON LABEL
      ORG 0003H ;EXTERNAL0 INTERRUPT

      RETI ;RETURN FROM THE INTERRUPT
      ORG 000BH ;TIMER0 INTERRUT
      RETI ;RETURN FROM THE INTERRUPT
      ORG 0013H ;EXTERNAL1 INTERRUPT

      RETI ;RETURN FROM THE INTERRUPT
      ORG 001BH ;TIMER1 INTERRUPT
      ; ljmp timer1

      RETI ;RETURN FROM THE INTERRUPT
      ORG 0023H ;SERIAL COMMUNICATION INTERRUPT
      RETI ;RETURN FROM THE INTERRUPT
      ORG 0030H

      POWERON: MOV SP,#70H ; Move the stack pointer at 70h location
      MOV IE,#00H ; Disable all the interrupts
      MOV IP,#00H ; Disable the interrupt priority register
      MOV P0,#0FFH ; Move 0FFH in in port 0
      MOV P1,#0FFH ; Move 0FFH in in port 1
      MOV P2,#0FFH ; Move 0FFH in in port 2
      MOV P3,#0FFH ; Move 0FFH in in port 3

      ;*RAM variable declaration ,30h-7Fh
      ;……………………………………….
      ;……………………………………….
      ;*********************************************************************************************;

      ;*****************POWER ON *************************************************************** ;

      ;****************************RAM CLEARANCE**********************************************;
      MOV R0,#7FH
      RAM_CLR: MOV @R0,#00H ; Clear the RAM from 00 to 7FH
      DJNZ R0,RAM_CLR
      ;;**********************************MAIN PROG******************************************************

      setb red
      setb yellow
      setb green
      clr relay1
      mov lcd,#38h
      acall command

      mov lcd,#01h
      acall command

      mov lcd,#0eh
      acall command

      mov lcd,#80h
      acall command

      MOV DPTR,#DATA1
      ACALL DISPLAY_
      main1:
      setb red
      setb yellow
      setb green
      mov r2,#70d

      main3:

      setb green
      setb RELAY1
      acall delay
      jnb senser1,check1
      djnz r2,main3
      mov r2,#50d
      sjmp main5

      main11:
      jnb p1.3,main3
      sjmp main11

      main:

      setb buzzer
      setb green
      setb red
      setb yellow
      jnb senser1,check1
      sjmp main

      main5:
      clr relay1
      acall delay
      setb green
      setb red
      setb yellow
      mov lcd,#0c0h

      acall command
      MOV DPTR,#level4
      ACALL DISPLAY_
      acall command
      sjmp main11

      check1:
      clr green

      setb red
      setb YELLOW
      jb senser1,main3

      jnb senser2,check2
      mov lcd,#0c0h
      acall command
      MOV DPTR,#level1
      ACALL DISPLAY_

      djnz r2,check1
      mov r2,#20

      sjmp main

      check2:
      clr YELLOW
      clr green
      setb red
      ;jnb p3.2,main3
      jnb senser3,check3
      jb senser2,main
      mov lcd,#0c0h
      acall command
      MOV DPTR,#level2
      ACALL DISPLAY_
      sjmp check2

      check3:
      clr red
      mov r3,#04
      clr YELLOW
      clr green
      clr relay1
      buzzer_on:
      clr buzzer
      acall delay
      setb buzzer
      acall delay
      jb senser3,main
      mov lcd,#0c0h
      acall command
      MOV DPTR,#level3
      ACALL DISPLAY_
      djnz r3,buzzer_on

      check34:
      setb buzzer
      acall delay
      clr red

      clr YELLOW
      clr green
      clr relay1

      jb senser3,main7
      mov lcd,#0c0h
      acall command
      MOV DPTR,#level3
      ACALL DISPLAY_
      sjmp check34
      main7:
      ljmp main

      DISPLAY_:
      CLR A
      MOVC A,@A+DPTR
      MOV LCD,A
      ACALL DATA
      INC DPTR
      JZ EXIT
      SJMP DISPLAY_
      EXIT:
      RET
      ;****************command*************
      command:
      clr RS
      setb EN
      nop
      nop
      nop
      nop
      nop
      clr EN
      ACALL DELAY
      ret

      ;*****************data***************
      data:
      setb RS
      setb EN
      nop
      nop
      nop
      nop
      nop
      clr EN
      ACALL DELAY
      ret
      ;***************************delay***************************************
      delay:
      mov 33h,#50d
      loop1: mov 34h,#50d
      loop2: mov 35h,#20d
      loop3: djnz 35h,loop3
      djnz 34h,loop2
      djnz 33h,loop1
      ret
      ;**************************************data byte******************************************************************

      ORG 300H
      DATA1:
      DB ‘ WATER LEVEL ‘,0
      level1:
      DB ‘Low Level ‘,0
      level2:
      DB ‘Medium Level ‘,0
      level3:
      DB ‘High Level ‘,0
      level4:
      DB ‘Input Line Fail ‘,0