Difference between revisions of "S13: Smart Security"

Revision as of 04:19, 22 May 2013

Grading Criteria

Smart Security

Safety often tends to wary people in various part of the world. Whether or not an individual is living in a neighborhood with high or low crime rates, security have always been a main concern. With the rising crime rates, even in area known to be safe, security companies have been trying to attract customer with their innovative features, but not so attractive pricing. Often the price could range anywhere starting at $1,400 for installation and from $23 a month ^[1]. Our project is to provide a solution for people who want a home security system, but not have to pay the huge installation cost and monthly fee.

Abstract

Smart Security is a system targeted for home security that continuously monitors movement, when armed. This system will alert the user wirelessly when it detects motion via text message and flash LEDs on the spot to try and scare off the intruder. The whole process can be control using a web based GUI for arming and disarming the system.

Objectives & Introduction

The Smart Security project communicates with the user using wireless connection to alert them of any movement within the proximity of the sensor. A PIR motion sensor is, connected to a LPC1758 microcontroller board, used as a detector to register any movement. A Wifly module, also attached to the LPC, maintain wireless connection to send and receive commands. The user is able to communicate with the board using a web based GUI, designed with Bootstrap, to arm and disarm the system as he/she please. When armed and motion is detected, the board will send commands to alert user using text messages. To prevent spam, users will receive periodic text messages versus one per motion detected.

Our objectives for the project:

• Interface PIR Sensor with LPC1758 board and register readings
• Use Wifly to communicate between the board and server
• Send alerts in the form of email/text messages when movement is detected
• Setup alarm in the form of flashing LEDs
• Create an interactive user web interface that handles the control of the sensor
• Setup connection between the board and server

Team Members & Responsibilities

• Kevin Deng
  • Interfacing PIR Motion Sensor with LPC1758 Microcontroller
  • Design Web UI
  • Project Report and Documentation
• Nelson Wong
  • Interface Wifly module with LPC1758
  • Wireless communication

Schedule

Parts List & Cost

Design & Implementation

Our project designs are composed of hardware and software, intercommunicating with one another to fulfill the overall process. The main component revolves around the sensor receiving and sending signals depending on the situation to a host server to transfer that signal into a message to the user. Each of these processes does so in a chain scenario where one depends on the other to function.

Hardware Design

Hardware components used in this project:

• LPC1758 MicroController
• Wifly Module
• PIR Motion Sensor
• Battery Pack

LPC1758 MicroController

The LPC1758 is the center of control for our whole project. It connects everything together into a single system to perform necessary operation to make this project function. We have our Wifly module, PIR motion sensor, LEDs, etc. all connected to this LPC to communicate interchangeably. Without this component, this project will not function at all.

Wifly Module

The RX-XV Wifly Module is our communication source between the wireless network and our overall system. The module is connected to our LPC1758 board and program to send and receive data based on events. This component allows us to communicate with the user and receive command from our website to arm and disarm the whole system. This device architecture is a standard TCP/IP platform and can migrate from 802.15.4 without any change.

Wifly Module

Wifly Module Connection

PIR Motion Sensor

The PIR motion sensor is our ‘eye’ for this project. Its main purpose is to detect motion within its proximity and log the result. The PIR is connected to our LPC1758 board and upon detection when armed, it will use the Wifly module to send an alert to the user. This component is very critical because it acts as our surveillance for our security system.

PIR Motion Sensor

PIR Motion Sensor Connection

Battery Pack

Initially the board and the motion sensor pull-up were powered by two separate USB connections. We then interface it with a battery pack to supply the necessary voltage amount to both.

Battery Pack

Top Level Connections

The following diagram shows the top level connection of all the components.

Top Level Connections

Hardware Interface

PIR Motion Sensor

Our PIR motion sensor requires a pull-up resistor for the alarm pin. When the sensor is in idle state, not detecting anything, the alarm pin will be high, but once motion is detected, the pin will pull to a low. The reason behind it is, the alarm pin is an open collector. This type of setup allows multiple motion sensors to be connected at once.

Wifly Module

The Wifly module was design to be a direct replacement from XBee to wireless connection. Everything is a direct fitment on top of XBee UART3. Once the pins are connected, between the board and module, it will be slightly harder to take off and be careful of the surrounding pins, as it might push it outward a little.

Battery Pack

We connected our Battery pack to the 5V Power input on the development board. We just screwed in power and ground to their respective inlet.

Connection Table

Our connections between the LPC1758 development board and components can be seen on the table below:

Software Design

Communication Diagram

The project was built based off of lab knowledge and Preet’s Replay Controller Project for our wireless implementation. From our lab we use our knowledge of binary and mutex semaphores to handle tasks. Our sensor needs to handle communication from sensor to transmit and receive data. Whereas transmit and receive communicate with one another.

Communication Process

Motion Sensor

• Always supply reading when power is on

SJ-One Board

• Use Wifly module to connect to the wireless gateway
• Check for Commands
• Maintain count of the motion sensor if armed
• Disable count if disarmed

RN-XV Wifi Module

• Try to connect whenever possible and maintain connection
• Receive from wireless gateway

Webserver

• Handles request and transmission of commands
• Pass it to wireless gateway

Web UI

• Sends command to arm or disarm

Wireless Router/Gateway

• Handles connection between webserver to both mail server and mobile device
• Pass necessary commands

Mail Server

• Send email notification to user

Mobile Device

• Send text message to user's mobile device

Process Diagram

Process Diagram

For our process diagram we made a simple layout of the operation once the board receives power. In the initial state we have to process the Wifly request to connect to the server. If connection is not stable we can not send the arm/disarm command. This step is very crucial to our whole process. Once the connection stage is stabilized, we will then began the check for the arm command. If it is not arm it will continue looping back to the previous stage and repeat. Once it is armed, the board will begin taking count on the sensor. Once detected it will increment the counter, and once it receives a certain amount it will send user a notification via text message and email. This process will repeat as long as the system is armed.

Implementation

Our implementation consist of several processes:

• Wifi Task
  • Transmit
  • Receive
• Sensor Task
• Web Interface
• PHP Script
  • ARM
  • DISARM
  • Mail

Wifi Transmit Task

Transmit Task

Our Wifi transmit task handles the process of sending out the counts recorded by the sensor. It will send it off to the web server under two circumstances:
1. Wifi Semaphore is true
2. Sensor Semaphore is true
The data will then be handle by the server and transmit to the user via email and text message.

Wifi Receive Task

Sensor Task

Web Interface

Web Interface

For our web interface we use Bootstrap from Twitter, to design our layout. Bootstrap is a perfect web development tool for beginner, in my perspective. It contains a lot of features, easy add-on, and a large array of references online to aid beginner like me to develop a simple user interface to interact with the user. We weren't able to fully develop our webpage, but it contains our main feature of arming and disarming our system. From there, we call our PHP script to handle the respective actions.

PHP Script

Testing & Technical Challenges

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Wifi Connection Issues

Many wifi connection issues were encountered. To solve this problem, a dedicated task was created to re-connect to wifi if the connection was ever lost.

Conclusion

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Project Video

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Project Source Code

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References

Acknowledgement

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References Used

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Appendix

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