Difference between revisions of "F15: Laser Security System"

Revision as of 11:41, 17 December 2015

Laser Security System

Final hardware design for master board

Final hardware design for second microcontroller, bluetooth module and Arduino

Abstract

The Laser Security System allows to maintain security in a room by shining a laser across a door's entrance and alerting via bluetooth communication by sending a text message to a smart phone that security has been compromised.

Objectives & Introduction

This security system will be using GPIO pins from the SJSUOne Board to connect to the RN42-XV Bluetooth Module using serial communication and another pin to the Arduino. The two bluetooth modules each connected to a SJSUOne Board will communicate with each other sending a message via text message using the Arduino module alerting that security has been compromised.

Objectives for this project:

• Research and design the schematics to connect a light detection circuit to one of the SJSUOne Board and showing the output by lighting an LED
• Research bluetooth communication and implement it to the light detection circuit
• Complete hardware design
• Test functionality of the system
• Able to send and receive text messages to smart phone via bluetooth
• Detect and connect to other bluetooth devices

Team Members & Responsibilities

Emmanuel Gonzalez: Software Implementation and Report Writer

Irlanda Altamirano: Hardware Implementation and Report Writer

Schedule

Parts List & Cost

Design & Implementation

The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.

Figure 1. SJSU One Board

Figure 2. Bluetooth Module

Figure 3. Cellular Antenna

Figure 4. Cellular Shield

Figure 5. Arduino Uno R3

Figure 6. System Block Diagram

Figure 7. Master SJSU One Board and Bluetooth schematics with light sensor circuit

Figure 8. Second SJSU One Board connected to Bluetooth module circuit schematics

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

Software Design

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

The following difficulties were encounter during this project but were able to successfully overcome them to delivery a functional project. Most of the time spent in this project was testing and debugging our program.

My Issue #1

At the beginning of the project we encounter some problems since we never had worked with bluetooth communication and interfacing it with laser detection circuit and between two microcontrollers. This was challenging but not impossible to solve this problem so from our part we conducted a lot of research before even building the first circuit in this project which was the light detection sensor circuit. One way to solve this problem was to break our project into 3 parts and make sure the first part of the project was performing its functionality before moving into the other part of the project.

My Issue #2

Another of the problems we encounter in this project was that a pin in the cellular shield was not giving enough power for two boards when trying to incorporate text messaging. To solve this problem we connected an external power supply to the Arduino board and connected the voltage pin to the SJSU one board and the cellular shield board.

My Issue #3

Sending a text message to a smart phone via bluetooth was challenging especially when trying to incorporate AT commands since we had not learn much about them. More research was done but we were running out of time in trying to debug the code and to not sacrifice the functionality of the device we decided to incorporated the Arduino board.

Conclusion

After overcoming the problems associated with this project and a lot of software debugging was performed we were able to successfully complete this project. Through out this project we learn about how to implement bluetooth communication between two microcontrollers from the hardware and software side. Understanding data sheets for the devices and obtaining the information needed to implemented such as bluetooth module, Arduino board, SJSO one board and cellular shield was crucial in order to obtain a successful outcome and functionality of the security system.

Project Video

Project Demo: https://youtu.be/Z2P5bmgPy7c

Project Source Code

• Sourceforge Source Code Link

References

Acknowledgement

We would like to thank the following people for their contributions and support during this project:

Preetpal Kang and Dr. Haluk Ozemek

References Used

Appendix

Bluetooth Module

https://www.sparkfun.com/products/11601

LPC1759 Datasheet

http://www.nxp.com/documents/data_sheet/LPC1759_58_56_54_52_51.pdf

LPC176x/5x User manual

http://www.nxp.com/documents/user_manual/UM10360.pdf

RN42XV Bluetooth Module

http://cdn.sparkfun.com/datasheets/Wireless/Bluetooth/RN42XV.pdf

General Purpose Transistor

file:///Users/Irlanda/Downloads/410427.pdf