Lab #9: Home security system (Alarm System)

Objective: Design and implement a microcontroller-based development board for a home security system using the PIC16F18875 microcontroller. The system should meet the specified performance requirements and be thoroughly documented.

Specifications

1. System Scope:
   • The system is designed to secure an average home.
   • It must monitor a minimum of 5 openings (doors or windows), with at least one door and one window.
2. Code Input:
   • The system will be enabled and disabled by inputting a 3-digit code sequentially.
3. Arming Delay:
   • A 30-second delay upon arming the system at a door opening to allow the occupant to exit without triggering the alarm.
4. Disarming Delay:
   • A 30-second delay upon entering the premises at a door opening to allow the occupant to enter and disarm the system without triggering the alarm.
5. Alarm Outputs:
   • Two distinct outputs:
     • A signal to activate an external siren or bell.
     • A second signal, delayed by 15 seconds, to notify a local monitoring station.
   • The external siren signal will have a silent feature.
6. Opening Indication:
   • The system will indicate which opening was entered when enabled and retain this information until reset.
7. Inputs and Outputs:
   • Inputs: Sensor outputs (5), code input, silent feature, and reset signal.
   • Outputs: Two system outputs for the siren and monitoring station, indicated by LEDs.
8. Board Design:
   • Ensure the development board has enough pins for all connections.

Requirements

1. Assembly Language Program:
   • Write the program in Assembly language with appropriate comments.
   • Include subroutines where possible to adhere to standard programming techniques.
2. Building and Debugging:
   • Build the program and produce the .asm file for review.
   • Download the .HEX file.
   • Debug the program thoroughly and include portions of the debug process in your report.
3. Demonstration:
   • Demonstrate the operational program to the instructor.
   • Post a demo video on Canvas.
4. Technical Report:
   • Prepare a fully documented technical report, including:
     • Introduction: Overview of the project and objectives.
     • Discussion of Results: Detailed explanation of the design process, including equations, graphs, schematics, oscilloscope pictures, and other relevant components.
     • Understandability: Ensure the report is understandable to another engineer or supervisor not working on the project.
     • Conclusion: Summarize the results, discuss interesting findings or unexpected outcomes.

Detailed Steps

1. Circuit Design:
   • Design the circuit to monitor 5 openings with sensors connected to the microcontroller.
   • Include input mechanisms for the 3-digit code, silent feature, and reset signal.
   • Design output connections for the siren and monitoring station, indicated by LEDs.
2. Coding:
   • Initialize the microcontroller’s I/O ports and configure the ADC for sensor inputs.
   • Write subroutines for reading the sensors, inputting the code, and managing delays.
   • Implement logic for arming/disarming the system, triggering alarms, and indicating which opening was entered.
3. Testing and Debugging:
   • Test the circuit and code to ensure all specifications are met.
   • Debug any issues and document the debugging process.
4. Documentation:
   • Create a detailed schematic diagram of the circuit.
   • Include high-quality pictures of the assembled circuit board.
   • Write and comment the assembly code.
   • Record a video demonstrating the working system.

Submission

• Schematic Diagram: Upload a PDF or image file of the schematic diagram.
• Circuit Board Pictures: Upload image files of the circuit board.
• Code: Include the commented assembly code in a text file or directly within the submission platform.
• Video: Upload the video file demonstrating the working security system.
• ASM and HEX Files: Upload the .asm and .HEX files containing the code.

Grading Criteria

1. Report Quality:
   • Clarity, spelling, grammar, and organization of the report.
   • The report should be understandable to another engineer or supervisor not involved in the project.
2. System Functionality:
   • Whether the system works according to the specifications.
   • How well the system was designed and implemented.
3. Programming Standards:
   • Adherence to standard programming techniques, including the use of subroutines.