Difference between revisions of "S17: Smart security system"

Revision as of 06:58, 17 May 2017

Grading Criteria

Project Title

Abstract

This section should be a couple lines to describe what your project does.

Objectives & Introduction

Show list of your objectives. This section includes the high level details of your project. You can write about the various sensors or peripherals you used to get your project completed.

Team Members & Responsibilities

• Kayalvizhi Rajagopal
• Parth
• Purvil
• Miroslav Grubic
• SHubham

Project Schedule

Parts List & Cost

Give a simple list of the cost of your project broken down by components. Do not write long stories here.

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.

PCB Design

PCB design was created in Autodesk Eagle v8.1.0. But first we created a draft, on paper, with all parts and functionalities we wanted to put on our PCB. On sparkfun.com there is a great tutorial about how to create schematic in Eagle.

First decision we had to make was what parts to use. Since we didn’t know fab companies are not soldering components, or charge extra for that, we created schematic with surface-mount components. After realising how small surface-mount components are and how difficult will be to solder them we had to start all over and change all components to through-hole.

Another important step was to choose library from which components will be imported. There is many library out there but we used sparkfun, adafruit and default Eagle library.

PCB Schematics

We created a Board/Board Layout From Schematic also by following sparkfun tutorial Using EAGLE: Board Layout. One of the things that wasn’t well explained in this tutorial is how to create board with your specific dimensions. SInce our plan was to mount SJOne board above PCB it was important to make PCB with the same dimensions as SJOne board and more important, to have holes for standoffs at the same place as the one on SJOne board. Luckily there is “Dimension” tool we used for that, although it wasn’t so easy to delete the lines that are left after using that tool.

After placing components where we wanted them, routing the board was easy with Autorouter...NOT. It produced too many errors, and wires were going too close to through-holes so we have to move wires away from them and basically do the routing manualy. Advice about routing would be to try to keep wires away as much as you can from through-holes, because when we were soldering components we were afraid that iron can damage the routes.

PCB Board Layout

Checking for errors was maybe the most important part of whole process since it helped us detect and correct few errors which we didn’t see during layout. In order to check for errors tool “DRC” Design Rule Check is used. First we used sparkfun anddefault Eagle drc files to check for errors but after we decided which fab company to used, and after checking their website and guidelines we also did final check with their drc file, what is strongly recommended. Same goes with CAM file that helped us create gerber files recomended by fab houses.

Picking a PCB manufacturer was really easy after reading this analysis. We used Oshpark because of this sentence “The quality is excellent, the boards are produced domestically, and shipping is covered in your board price.” No need to say more….or actually there is...they are purple. Yes you read right, purple. It took less then 10 days to receive them from the day we submitted our request.

We already had many components we needed but the ones we didn’t have we had to buy. As the best choice, regarding the price, there is Excess Solution.

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.

Accelerometer

We are taking accelerometer values at SJOne board that is used as remote control and sending numbers that represent range which accelerometer is currently at. There is eight ranges per axis with numbers -4 to 4 representing them. First we created struct with three members, starting value of range, end value of range and number of range. Then we create and initialize array with struct as members. Inside while(1) loop we are getting accelerometer values and looping through all ranges, where we checking if read value of accelerometer belongs to range we are currently at. If the read value belongs to the current range, send the number of that range to motor task.

The below flowchart explains how this tasks works.

Accelerometer flowchart

Nordic Wireless

In this project we are using two SJOne boards. One of them will be connected to two motors which are turning camera arm in desired direction. Camera direction will be based on two events. One of them is if sensor detect movement camera will turn in direction covered by that sensor and another one is controled by client or user of this system by turning another SJOne board. Another SJOne board will serve as a joystick or remote control and it will be possible to turn camera in desired direction by turning SJOne board. Two boards, the one that serve as remote control and the main one will communicate by utilizing Nordic Wireless.

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

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Include sub-sections that list out a problem and solution, such as:

My Issue #1

Interface camera with SJOne board

Problem: First issue we encountered was when we wanted to interface camera to the SJOne board. If you look at the pictures of PCB you will notice that in bottom part of PCB there is 8 through-holes that were meant to be used for the camera. They are left unused since camera we had was Arducam. It was supposed to be able to interface it with any board using I2C or SPI. It turned out that only way to interface that camera is by using Arduino boards or Raspberry Pi with Arduino library. So don’t try to do that.

Solution: Problem was solved after consulting Preet and getting permission to use Raspberry Pi just to interface camera but still to send signal to capture photo from SJOne board by UART.

My Issue #2

Discuss the issue and resolution.

Conclusion

Conclude your project here. You can recap your testing and problems. You should address the "so what" part here to indicate what you ultimately learnt from this project. How has this project increased your knowledge?

Project Video

Upload a video of your project and post the link here.

Project Source Code

• Sourceforge Source Code Link

References

Acknowledgement

Any acknowledgement that you may wish to provide can be included here.

References Used

List any references used in project.

Appendix

You can list the references you used.