Creating a Simple Room Security System

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Discussion Overview

The discussion revolves around designing a simple room security system using basic electronic components, specifically resistors, a thin wire, batteries, and a piezoelectric buzzer. Participants explore circuit design ideas and functionality related to triggering an alarm when a wire is broken, as well as considerations for tampering detection.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant suggests that placing a resistor mid-wire may not effectively detect intrusions, raising questions about the circuit design.
  • Another participant proposes that the alarm should sound continuously until a component is shorted out, indicating a potential design approach.
  • A rough circuit draft is described, featuring a square layout with a ground and resistors, but lacking clarity on the piezoelectric buzzer's integration.
  • Some participants request visual representations of the circuit, noting the absence of the buzzer in the descriptions provided.
  • There is mention of a PSPICE diagram that aims to illustrate the alarm system, but concerns are raised about its functionality and the buzzer's role.
  • One participant questions whether the design needs to account for tampering detection, suggesting a potential area for further exploration.

Areas of Agreement / Disagreement

Participants express varying opinions on the circuit design and functionality, with no consensus reached on the best approach or the necessity of additional features like tampering detection.

Contextual Notes

Participants have not fully resolved the assumptions regarding component placement and the overall circuit functionality, particularly concerning the integration of the piezoelectric buzzer and the implications of the design choices made.

Who May Find This Useful

Individuals interested in basic electronics, circuit design, or those seeking to understand simple alarm systems may find this discussion relevant.

Mosaness
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1. The challenge is to create a simple security system using only resistors, a very thin wire, 12 AAA batteries, and a piezoelectric buzzer.

2. The attempt at a solution

I recall reading that if a resistor is placed mid-wire in an alarm system, it will not detect any problems, such as a person trespassing or breaking in.

I did a little bit of research and came across a pdf that highlights a few points towards building an alarm.

My input source would be the batteries to provide a voltage to power the alarm. The output would be the piezoelectric buzzer. What remains is designing the system.

Can someone help me out with this? I need to do this extra credit to salvage my grade in that class.
 
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So the idea is that when someone opens a window it breakes the thin wire and that sounds the alarm?

So design a circuit that sounds the alarm all the time but which can be turned off by shorting out a component with a wire.
 
CWatters said:
So the idea is that when someone opens a window it breakes the thin wire and that sounds the alarm?

So design a circuit that sounds the alarm all the time but which can be turned off by shorting out a component with a wire.

That's pretty much the idea. Sort of like a burglar alarm. The only components allowed are:

1) Resistors of 1k
2) Wire w/ resistance of 1ohm
3) A piezo electric buzzer.
4) 12 AAA 1.5V batteries

My initial rough draft was a square with a ground at the leftmost corner and a resistor at the remaining three corners. There were 3 AAA batteries that I put in the middle of one side to act as the voltage source. I was thinking that the side with the batteries could be the entry point.
 
Can you draw that. You didn't mention thepiezo in your description of the circuit.

I see no need to distribute components around the room on a simple design. Is there more to the question? Such as a need to detect tampering?
 
CWatters said:
Can you draw that. You didn't mention thepiezo in your description of the circuit.

I see no need to distribute components around the room on a simple design. Is there more to the question? Such as a need to detect tampering?

I can show you the PSPICE diagram that I created for it. I'll attach that. That alarm is suppose to attack as a sensor for any window that is broken or opened.
 

Attachments

  • PSPICE.jpg
    PSPICE.jpg
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No one has any suggestions?...
 
What about the suggestion in post #2?
 
Mosaness said:
I can show you the PSPICE diagram that I created for it. I'll attach that. That alarm is suppose to attack as a sensor for any window that is broken or opened.

I can't see the top of that diagram but there doesn't appear to be a buzzer in the circuit but if there is it appears to sound all the time until the circuit is broken.
 

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