ECE497 Project GPS Tracker

Team members: Robert Fendricks, Chris Hopwood

Grading Template
I'm using the following template to grade. Each slot is 10 points. 0 = Missing, 5=OK, 10=Wow!

 00 Executive Summary 00 Installation Instructions 00 User Instructions 00 Highlights 00 Theory of Operation 00 Work Breakdown 00 Future Work 00 Conclusions 00 Demo 00 Late Comments: I'm looking forward to seeing this.

Score: 10/100

(Inline Comment)

Executive Summary
Chris Hopwood and Robert Fendricks will be working on a way to interface the Beaglebone Black with a GPS tracker using UART. We plan on using this data to track the Bone's location on a map via a web interface.

Packaging
If you have hardware, consider Small Build, Big Execuition for ideas on the final packaging.

Installation Instructions
Give step by step instructions on how to install your project.


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User Instructions
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Highlights
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Theory of Operation
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Work Breakdown
We first attempted to connect to the Beaglebone via the included FTDI cable. Here is a link to the FTDI cable's ref. sheet: http://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_TTL-232R_CABLES.pdf. To connect the

List the major tasks in your project and who did what.

Also list here what doesn't work yet and when you think it will be finished and who is finishing it.

GPS
The GPS we are using is MTK3339

To load the device tree overlay on the beaglebone:  root@beaglebone# ./gps-tracker/load_uart_overlay.sh  This should connect UART4-rx onto P9_11.

To confirm which tty the UART is exposed as, run: root@beaglebone# dmesg | tail On our beagle it outputted:  [  50.991396] bone-capemgr bone_capemgr.8: slot #8: 'Override Board Name,00A0,Override Manuf,BB-UART4' [  50.991495] bone-capemgr bone_capemgr.8: slot #8: Requesting part number/version based 'BB-UART4-00A0.dtbo [  50.991514] bone-capemgr bone_capemgr.8: slot #8: Requesting firmware 'BB-UART4-00A0.dtbo' for board-name 'Override Board Name', version '00A0' [  50.991542] bone-capemgr bone_capemgr.8: slot #8: dtbo 'BB-UART4-00A0.dtbo' loaded; converting to live tree [  50.991860] bone-capemgr bone_capemgr.8: slot #8: #2 overlays [  50.995484] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61) is a OMAP UART4 [  50.996082] bone-capemgr bone_capemgr.8: slot #8: Applied #2 overlays. [  51.171271] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 2 to 2 [  61.202485] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 2 to 2 [  71.233751] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 2 to 2



According to [  50.995484] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61) is a OMAP UART4 our port is mapped to ttyO4.

To test if the GPS is connected correctly, run:  root@beaglebone# screen /dev/ttyO4 9200  replacing ttyO4 with whatever device dmesg reported earlier.

To disconnect from the screen session correctly, press + +<:>, then type ":quit"

Installing pyserial
First, install pip, python's package manager:  root@beaglebone# opkg install python-pip  After that finishes, downgrade pip using easy_install (which should be installed now) because the latest pip uses ssl, and complains about certificates.  root@beaglebone# easy_install pip=1.2.1 

Now instal pyserial  root@beaglebone# pip install pyserial 

pyserial should now be installed! Load it in python by doing:  import serial 

Google Maps Webpage
We used Google Maps in Javascript to interface with the Beaglebone Black and display our GPS information.

Robert started work on this, first using Dr. Yoder's Boneserver script to create a simple server. A new webpage was added that just had map on it. Google provides free documentation for their API, and it turns out it's fairly straight forward to use. One of the many features that Google offers with this API is the ability to draw on the map, such as placing markers and drawing lines. By using the marker class in conjunction with actionlisteners, I was able to create a button that would place a marker on coordinates specified by the user. The next step will be to have a script that will read from a file and place markers or lines on the map given a time range.

Ad Hoc Networking
For this project, we felt that being able to connect to the Beaglebone directly to access the web interface would be beneficial. To do this, we looked into setting up an ad-hoc wireless network.

To do this, first make sure that you have a wireless interface installed an configured on the Bone. We used Adafruit's RTL8192CU wireless adapter on our bone.

Once your wireless adapter has been configured, you are now ready to set up the Ad Hoc network. The following commands must be run on both the Beaglebone and the computer you want to connect to the Beaglebone. Note that this will utilize the wireless adapter on your computer, so you won't be able to use it for connecting to the internet. These commands are:  bash# ip link set down #This will bring your wireless interface down bash# iw set type ibss #This sets your interface to act as an Ad Hoc Network bash# ip link set up #Bring your interface back up bash# iw ibss join <SSID> #This sets up an SSID for your ad hoc network. </b>

Once these commands have been run on both machines, you now want to assign an IP address to both. The most straight forward way is to use a static IP for both, making sure they are on the same subnetwork. Running the following command on each will accomplish this:  bash# ip addr add <IP address>/ dev </b>
 * 1) e.g.: ip addr add 192.168.5.1/24 dev wlan0
 * 2) This should go without saying, but make sure the IP address is different on the two machines

Now you should be able to ping the IP of the opposite machine and get a response. If you get it, you're done! In our experience, it can take a while of pinging before we get a response back. We will have to look into what the cause of this is.

Automated Script
For our project, we compiled these changes into a easy to use script, called "ad-hoc_setup.sh". The script works as follows:  ad-hoc_setup.sh <IP_Address> <SSID> </b> This script must be run on both the Bone and the host that you want to add to the ad-hoc network. Keep in mind that the IP_Address must be different (but on the same subnet, /24) and the SSID must be the same.

Future Work
Suggest addition things that could be done with this project.

Conclusions
Give some concluding thoughts about the project. Suggest some future additions that could make it even more interesting.

Useful Links
Server Side Events info: http://www.html5rocks.com/en/tutorials/eventsource/basics/

GPS Ref. Sheet: http://learn.adafruit.com/downloads/pdf/adafruit-ultimate-gps.pdf

GPS NMEA Sentences: http://www.gpsinformation.org/dale/nmea.htm