Title: Started Learning Python
Author: Jacob Cytron
Date: 2/2/2018
Hours: 2
Watched assorted videos on learning Python
Read through more of the links
Pi Car Comm Log
Revision as of 21:30, 2 February 2018 by Patrickrnaughton (talk | contribs)
https://classes.engineering.wustl.edu/ese205/core/index.php?title=Pi_Car_Comm
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Contents
Useful Links
- Using 802.11a to simulate 802.11p: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6060057&tag=1
- Paper where this was done with a real car: http://www.ijste.org/articles/IJSTEV2I10148.pdf
- Pi Car github: https://github.com/xz-group/PiCar
- Mesh Network Tutorial: http://www.ericerfanian.com/mobile-mesh-networks-with-the-raspberry-pi-part-1/
- Setting up a static IP address: https://www.mathworks.com/help/supportpkg/raspberrypi/ug/getting-the-raspberry_pi-ip-address.html?requestedDomain=true
- Running commands on startup: https://www.raspberrypi.org/forums/viewtopic.php?t=14588
Week 1
Title: Yak Week 1 Work
Author: Yak Fishman
Date: 2/2/2018
Hours: 7
Attended group meeting and discussed group goals.
Continued research into materials and read linked articles.
Began to brush up on Python for future coding we will do
Title: Pinging Over Ad Hoc Network
Author: Patrick Naughton
Date: 2/1/2018
Hours: 2
Successfully pinged one Raspberry Pi from the other one over an ad hoc network.
Configured each Pi to create an ad-hoc network on startup and assign itself a static IP address.
Relevant files:
- etc/network/interface
- etc/rc.local
Next steps:
-
Exchanging strings between both Pis.
- The following link/module may be helpful: https://stackoverflow.com/questions/34548037/two-raspberries-communicating-each-other
Title: Ad-Hoc Communication
Author: Patrick Naughton
Date: 1/31/2018
Hours: 0.5
Confirmed that ad-hoc networking is feasible. Used one Raspberry Pi to create a Wi-Fi access point that my phone could detect.
Additionally, no Wi-Fi adapter was necessary because the Raspberry Pi model 3 comes with it's own native Wi-Fi capabilities.
Next steps:
- Getting both Pi's to create ad-hoc networks
- Ping one Pi from the other
Title: Getting Materials
Author: Patrick Naughton
Date: 1/29/2018
Hours: 2.5
Got a key to the lab so that we can access materials.
Met with group to discuss objectives and potential challenges.
Acquired 2 Raspberry Pis to experiment with in order to see how easy it is to establish ad hoc communication.
Met with Dr. Zhang to discuss progress.
Discussed potential for different demos. A "mirroring" demo may be more feasible if other groups are not as successful as hoped.
Met with other groups to see their progress.
Title: First Weekly Meeting
Author: Jacob Cytron
Date: 1/29/2018
Hours: 1
I attended the first weekly meeting. We clarified our end goals for the piCar project and talked over how we will accomplish our goals.
Title: PiCar Research
Author: Jacob Cytron
Date: 1/28/2018
Hours: 2
I read some articles on the 802.11 modules and I also read through the thesis on the DriveIt communication between Raspberry Pi cars.
Title: Yet Another WiFi Adapter
Author: Patrick Naughton
Date: 1/28/2018
Hours: 1
Found yet another WiFi adapter, this one suggested by a paper specifically about using the Raspberry Pi as an "on board unit" for DSRC in a VANET. This specific adapter, at least upon initial inspection, looks like it would be a good candidate because it has Linux support, can run in ad hoc mode (CTRL-F the documentation for ad hoc, it specifies how to set it up), and runs in the 5GHz band with backwards compatibility for the 802.11a protocol. Additionally, the authors of the paper successfully used it to establish communication on a Raspberry Pi, meaning this is possible.
Adapter: https://www.amazon.com/TP-Link-Wireless-Adapter-Archer-T1U/dp/B016K088UC
Adapter documentation: https://images-na.ssl-images-amazon.com/images/I/C1BISG1QKyS.pdf
Title: A Better WiFi Adapter and a Tutorial
Author: Patrick Naughton
Date: 1/28/2018
Hours: 1
Just found a Wi-Fi adapter compatible with the 802.11a standard. It does not come with a driver on the latest version of the Raspberry Pi, which could actually be a good thing because it means we can compile the driver ourselves (modifying open source designs to suit our needs). Links to the adapter and tutorial can be found at the end of the post.
This is available on Amazon (https://www.amazon.com/Edimax-EW-7811UTC-Dual-Band-Connectivity-Exceeding/dp/B00FW6T36Y/ref=sr_1_1?ie=UTF8&qid=1517199327&sr=8-1&keywords=AC600+Wireless+Dual-Band+Mini+USB+Adapter+EW-7811UTC) for about $16
Tutorial: https://layereight.de/raspberry-pi/2016/08/25/raspbian-rtl8812au.html
Link to github for open source driver: https://github.com/gnab/rtl8812au
Reference: adapters that work with Raspberry Pi: https://elinux.org/RPi_USB_Wi-Fi_Adapters
Title: WiFi Adapter and more
Author: Patrick Naughton
Date: 1/27/2018
Hours: 1.5
Based on this article (http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6060057&tag=1), we should be able to use an 802.11a driver to mimic a worst case scenario 802.11p driver. The paper concludes that with minor software adjustments,
VANET solutions that are validated using this approximation will also work on real hardware with better signal quality. As long as experimenters are aware of the limitations of the presented solution, it can be successfully applied as a cost-effective tool for VANET research.
We therefore need not find an 802.11p module - a more common 802.11a module will do.
Unfortunately, finding an 802.11a module is also surprisingly difficult. However, an 802.11n module should be able to operate in 802.11a mode because they share the same frequency (5GHz). This means an 802.11n module should suit our needs, as long as we can modify the device driver to make the minor adjustments the above paper discusses. Directly below is an example of such a driver.
https://www.canakit.com/raspberry-pi-wifi.html
In addition to supporting 802.11n operation, the dongle must also support ad hoc mode. This is because that seems to be the best way to set up a network mesh among multiple raspberry pis. Instructions for doing so can be found at the following link:
http://www.ericerfanian.com/mobile-mesh-networks-with-the-raspberry-pi-part-1/
Using an ad-hoc network mesh seems to be the best available solution. DSRC/WAVE, which nearly every source cites as the way to send emergency communications between cars, is an ad hoc network (https://www.hindawi.com/journals/jat/2017/2750452/). Such a network does not rely on external routers, so even if the cars lose internet access, they can still communicate with one another.
Title: Link Dump
Author: Patrick Naughton
Date: 1/26/2018
Hours: ~10-15
Link dump of all the papers/modules I've found regarding this project.
https://www.hindawi.com/journals/jat/2017/2750452/
http://sandhill.com/wp-content/files_mf/whitepapervehicle_to_vehicle_communicationeinfochips.pdf
http://www.promiot.com/v2x/vtx-201
https://www.ietf.org/mail-archive/web/its/current/msg00935.html
http://dimme.net/tag/raspberry-pi/ <-- This is the master's thesis that's really good/thorough
https://www.unex.com.tw/products/dsrc-v2x/technology/v2x-on-board-unit/1609x-stack/detail/obu-201u
https://www.academia.edu/20878754/Accessible_customizable_high-performance_IEEE_802.11p_vehicular_communication_solution?auto=download
Author: Patrick Naughton
Date: 1/26/2018
Link to modification article. Hopefully we can use this to modify an existing 802.11a (WiFi) module to fit our needs.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6060057&tag=1
Author: Patrick Naughton
First log
