8086-ASSEMBLY-LANGUAGE-PROGRAMS/Source Code/Simulation/fire_monitoring_system.asm at main · Amey-Thakur/8086-ASSEMBLY-LANGUAGE-PROGRAMS · GitHub

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; =============================================================================
; TITLE: Fire Monitoring System (Simulation)
; DESCRIPTION: Emulate a temperature-based fire alarm system. The program
;              monitors ambient temperature against user-defined thresholds
;              for two distinct rooms and triggers an alarm if exceeded.
; AUTHOR: Amey Thakur (https://github.com/Amey-Thakur)
; REPOSITORY: https://github.com/Amey-Thakur/8086-ASSEMBLY-LANGUAGE-PROGRAMS
; LICENSE: MIT License
; =============================================================================

.MODEL SMALL
.STACK 100H

; -----------------------------------------------------------------------------
; DATA SEGMENT
; -----------------------------------------------------------------------------
.DATA
    LIMIT1      DB ?                     ; Threshold for Room 1
    LIMIT2      DB ?                     ; Threshold for Room 2

    MSG_LIMIT1  DB 10,13,"Set Threshold for Room 1: $"
    MSG_LIMIT2  DB 10,13,"Set Threshold for Room 2: $"
    MSG_ALARM   DB 10,13,07,"!!! ALARM ON !!! Threshold exceeded! $" ; 07 is bell
    MSG_RESTART DB 10,13,"Press '1' to reset system or any key to exit: $"
    MSG_STATUS  DB 10,13,"Current Temperature: $"

; -----------------------------------------------------------------------------
; CODE SEGMENT
; -----------------------------------------------------------------------------
.CODE
MAIN PROC
    ; Initialize Segment
    MOV AX, @DATA
    MOV DS, AX

    ; 1. System Setup - Internalize Thresholds
    LEA DX, MSG_LIMIT1
    MOV AH, 09H
    INT 21H
    CALL READ_BCD_DIGIT
    MOV LIMIT1, AL

    LEA DX, MSG_LIMIT2
    MOV AH, 09H
    INT 21H
    CALL READ_BCD_DIGIT
    MOV LIMIT2, AL

    ; -------------------------------------------------------------------------
    ; MONITORING LOOP
    ; -------------------------------------------------------------------------
START_MONITOR:
    MOV CL, 0                           ; Starting temperature at 0 degrees

INC_TEMP:
    LEA DX, MSG_STATUS
    MOV AH, 09H
    INT 21H

    ; Display current CL as digit
    MOV DL, CL
    ADD DL, '0'
    MOV AH, 02H
    INT 21H

    ; Check against safety limits
    CMP CL, LIMIT1
    JGE TRIGGER_ALARM
    CMP CL, LIMIT2
    JGE TRIGGER_ALARM

    INC CL                              ; Temperature rises...

    ; Optional: Add a small delay simulation here if desired
    JMP INC_TEMP

    ; -------------------------------------------------------------------------
    ; ALARM STATE
    ; -------------------------------------------------------------------------
TRIGGER_ALARM:
    LEA DX, MSG_ALARM
    MOV AH, 09H
    INT 21H

    LEA DX, MSG_RESTART
    MOV AH, 09H
    INT 21H

    MOV AH, 01H                         ; Wait for user interaction
    INT 21H

    CMP AL, '1'
    JE START_MONITOR                    ; System reset

    ; Program termination
    MOV AH, 4CH
    INT 21H
MAIN ENDP

; -----------------------------------------------------------------------------
; HELPER: READ_BCD_DIGIT
; Reads one char, returns numeric value in AL.
; -----------------------------------------------------------------------------
READ_BCD_DIGIT PROC
    MOV AH, 01H
    INT 21H
    SUB AL, '0'
    RET
READ_BCD_DIGIT ENDP

END MAIN

; =============================================================================
; TECHNICAL NOTES
; =============================================================================
; 1. SIMULATION LOGIC:
;    - This models a simple "Control Loop" found in embedded systems.
;    - It uses BCD (Binary Coded Decimal) logic for easy I/O.
;    - The ASCII character 07h is sent to standard output to trigger a
;      system beep (hardware buzzer simulation).
; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =