In this project we shall be using the 8051 Microcontroller to run a fire alarm system that will be used as a safety measure for most of the homes and commercial premises to warn the people in case of a fire outbreak.
 The system consist of several modules that will be having different functions. The display module which will be made up of the LM016L LCD will be our display module where it shall be displaying messages to the occupants. I f we have fire outbreak, the display will read ,'FIRE OCCURRED' and if we shall not have fire the system shall display 'FIRE ALARM SYSTEM'. The buzzer module will raise the alarm while the motor module will open all the doors and emergency openings. The AT89C51 will be the control module for the system. The code for the project will be in .hex file which I did in KEIL IDE.
 Components:
1. 8051 Microcontroller
2. The Display LCD- LM016L
3. The DC Motor
4. The Buzzer.
5. Logic State.
Code:
 
ORG 0000H
  LJMP 0997H
ORG 0800H
  MOV 0F0H,#08H
  MOV 82H,#00H
  MOV A,R7
  ADD A,R7
  MOV R7,A
  MOV A,R6
  RLC A
  MOV R6,A
  XCH A,R5
  RLC A
  XCH A,R5
  XCH A,R4
  RLC A
  XCH A,R4
  XCH A,82H
  RLC A
  XCH A,82H
  SUBB A,R3
  MOV A,R5
  SUBB A,R2
  MOV A,R4
  SUBB A,R1
  MOV A,82H
  SUBB A,R0
  JC 0CH
  MOV 82H,A
  MOV A,R6
  SUBB A,R3
  MOV R6,A
  MOV A,R5
  SUBB A,R2
  MOV R5,A
  MOV A,R4
  SUBB A,R1
  MOV R4,A
  INC R7
  DJNZ 0F0H,0D6H
  CLR A
  XCH A,R6
  MOV R3,A
  CLR A
  XCH A,R5
  MOV R2,A
  CLR A
  XCH A,R4
  MOV R1,A
  MOV R0,82H
  RET
  CJNE R0,#00H,0C1H
  CJNE R1,#00H,59H
  CJNE R2,#00H,2DH
  MOV A,R4
  MOV 0F0H,R3
  DIV AB
  XCH A,R7
  XCH A,R6
  XCH A,R5
  MOV R4,A
  MOV A,0F0H
  XCH A,R3
  MOV R1,A
  MOV R0,#18H
  MOV A,R7
  ADD A,R7
  MOV R7,A
  MOV A,R6
  RLC A
  MOV R6,A
  MOV A,R5
  RLC A
  MOV R5,A
  MOV A,R4
  RLC A
  MOV R4,A
  MOV A,R3
  RLC A
  MOV R3,A
  JBC 0D7H,03H
  SUBB A,R1
  JC 04H
  MOV A,R3
  SUBB A,R1
  MOV R3,A
  INC R7
  DJNZ R0,0E5H
  CLR A
  MOV R1,A
  MOV R2,A
  RET
  MOV R0,#18H
  MOV A,R7
  ADD A,R7
  MOV R7,A
  MOV A,R6
  RLC A
  MOV R6,A
  MOV A,R5
  RLC A
  MOV R5,A
  MOV A,R4
  RLC A
  MOV R4,A
  XCH A,R1
  RLC A
  XCH A,R1
  JBC 0D7H,05H
  SUBB A,R3
  MOV A,R1
  SUBB A,R2
  JC 07H
  MOV A,R4
  SUBB A,R3
  MOV R4,A
  MOV A,R1
  SUBB A,R2
  MOV R1,A
  INC R7
  DJNZ R0,0E0H
  CLR A
  XCH A,R1
  MOV R2,A
  CLR A
  XCH A,R4
  MOV R3,A
  RET
  MOV 0F0H,#10H
  MOV A,R7
  ADD A,R7
  MOV R7,A
  MOV A,R6
  RLC A
  MOV R6,A
  MOV A,R5
  RLC A
  MOV R5,A
  XCH A,R4
  RLC A
  XCH A,R4
  XCH A,R0
  RLC A
  XCH A,R0
  JBC 0D7H,07H
  SUBB A,R3
  MOV A,R4
  SUBB A,R2
  MOV A,R0
  SUBB A,R1
  JC 0AH
  MOV A,R5
  SUBB A,R3
  MOV R5,A
  MOV A,R4
  SUBB A,R2
  MOV R4,A
  MOV A,R0
  SUBB A,R1
  MOV R0,A
  INC R7
  DJNZ 0F0H,0DAH
  CLR A
  XCH A,R5
  MOV R3,A
  CLR A
  XCH A,R4
  MOV R2,A
  CLR A
  XCH A,R0
  MOV R1,A
  RET
  MOV A,R3
  SUBB A,R7
  MOV 0F0H,A
  MOV A,R2
  SUBB A,R6
  ORL 0F0H,A
  MOV A,R1
  SUBB A,R5
  ORL 0F0H,A
  MOV A,R0
  SUBB A,R4
  ORL A,0F0H
  RET
  MOV A,#01H
  MOV R7,A
  RLC A
  SUBB A,0E0H
  MOV R6,A
  MOV R5,A
  MOV R4,A
  INC R0
  INC R0
  INC R0
  MOV A,@R0
  ADD A,R7
  MOV R7,A
  MOV @R0,A
  DEC R0
  MOV A,@R0
  ADDC A,R6
  MOV R6,A
  MOV @R0,A
  DEC R0
  MOV A,@R0
  ADDC A,R5
  MOV R5,A
  MOV @R0,A
  DEC R0
  MOV A,@R0
  ADDC A,R4
  MOV R4,A
  MOV @R0,A
  RET
  MOV 19H,R7
  MOV 18H,R6
  MOV 17H,R5
  MOV 16H,R4
  CLR A
  MOV R3,#0E8H
  MOV R2,#03H
  MOV R1,A
  MOV R0,A
  LCALL 083CH
  MOV A,#08H
  ADD A,R7
  MOV R0,A
  MOV A,@R0
  MOV 80H,A
  SETB 0A0H
  MOV R7,#1EH
  LCALL 0A5CH
  CLR 0A0H
  CLR A
  MOV R3,#64H
  MOV R2,A
  MOV R1,A
  MOV R0,A
  MOV R7,19H
  MOV R6,18H
  MOV R5,17H
  MOV R4,16H
  LCALL 083CH
  CLR A
  MOV R3,#0AH
  MOV R2,A
  MOV R1,A
  MOV R0,A
  LCALL 083CH
  MOV A,#08H
  ADD A,R3
  MOV R0,A
  MOV A,@R0
  MOV 80H,A
  SETB 0A1H
  MOV R7,#1EH
  LCALL 0A5CH
  CLR 0A1H
  CLR A
  MOV R3,#0AH
  MOV R2,A
  MOV R1,A
  MOV R0,A
  MOV R7,19H
  MOV R6,18H
  MOV R5,17H
  MOV R4,16H
  LCALL 083CH
  CLR A
  MOV R3,#0AH
  MOV R2,A
  MOV R1,A
  MOV R0,A
  LCALL 083CH
  MOV A,#08H
  ADD A,R3
  MOV R0,A
  MOV A,@R0
  MOV 80H,A
  SETB 0A2H
  MOV R7,#1EH
  LCALL 0A5CH
  CLR 0A2H
  CLR A
  MOV R3,#0AH
  MOV R2,A
  MOV R1,A
  MOV R0,A
  MOV R7,19H
  MOV R6,18H
  MOV R5,17H
  MOV R4,16H
  LCALL 083CH
  MOV A,#08H
  ADD A,R3
  MOV R0,A
  MOV A,@R0
  MOV 80H,A
  SETB 0A3H
  MOV R7,#1EH
  LCALL 0A5CH
  CLR 0A3H
  RET
  MOV R0,#7FH
  CLR A
  MOV @R0,A
  DJNZ R0,0FDH
  MOV 81H,#19H
  LJMP 09DEH
  LJMP 0A23H
  CLR A
  MOVC A,@A+DPTR
  INC DPTR
  MOV R0,A
  CLR A
  MOVC A,@A+DPTR
  INC DPTR
  JC 03H
  MOV @R0,A
  SJMP 01H
  MOVX @R0,A
  INC R0
  DJNZ R7,0F4H
  SJMP 29H
  CLR A
  MOVC A,@A+DPTR
  INC DPTR
  MOV R0,A
  ANL A,#07H
  ADD A,#0CH
  XCH A,R0
  CLR C
  RLC A
  SWAP A
  ANL A,#0FH
  ORL A,#20H
  XCH A,R0
  MOVC A,@A+PC
  JC 04H
  CPL A
  ANL A,@R0
  SJMP 01H
  ORL A,@R0
  MOV @R0,A
  DJNZ R7,0E4H
  SJMP 0BH
  AJMP 002H
  INC A
  INC R0
  JBC 20H,40H
  SJMP 90H
  INC R2
  ACALL 3E4H
  MOV R6,#01H
  MOVC A,@A+DPTR
  JZ 0BCH
  INC DPTR
  MOV R7,A
  ANL A,#3FH
  JNB 0E5H,09H
  ANL A,#1FH
  MOV R6,A
  CLR A
  MOVC A,@A+DPTR
  INC DPTR
  JZ 01H
  INC R6
  XCH A,R7
  ANL A,#0C0H
  ADD A,0E0H
  JZ 0A8H
  JC 0B8H
  CLR A
  MOVC A,@A+DPTR
  INC DPTR
  MOV R2,A
  CLR A
  MOVC A,@A+DPTR
  INC DPTR
  MOV R0,A
  CLR A
  MOVC A,@A+DPTR
  INC DPTR
  XCH A,R0
  XCH A,82H
  XCH A,R0
  XCH A,R2
  XCH A,83H
  XCH A,R2
  MOVX @DPTR,A
  INC DPTR
  XCH A,R0
  XCH A,82H
  XCH A,R0
  XCH A,R2
  XCH A,83H
  XCH A,R2
  DJNZ R7,0E9H
  DJNZ R6,0E7H
  SJMP 0BEH
  CLR A
  MOV 15H,#01H
  MOV 14H,A
  MOV 13H,A
  MOV 12H,A
  MOV R0,#12H
  LCALL 08DFH
  MOV 15H,R7
  MOV 14H,R6
  MOV 13H,R5
  MOV 12H,R4
  LCALL 08FFH
  CLR A
  MOV R7,#0FH
  MOV R6,#27H
  MOV R5,A
  MOV R4,A
  MOV R3,15H
  MOV R2,14H
  MOV R1,13H
  MOV R0,12H
  CLR C
  LCALL 08CEH
  JNZ 0DBH
  MOV 15H,A
  MOV 14H,A
  MOV 13H,A
  MOV 12H,A
  SJMP 0D1H
  MOV A,R7
  MOV R5,A
  RLC A
  SUBB A,0E0H
  MOV R4,A
  SETB C
  MOV A,R5
  SUBB A,#00H
  MOV A,R4
  XRL A,#80H
  SUBB A,#80H
  JC 03H
  DEC R7
  SJMP 0ECH
  RET
  INC R2
  INC R0
  PUSH 0F9H
  MUL AB
  ANL C,/99H
  MOV 82H,C
  MOV R0,A
  SJMP 90H
  NOP
  END