APRS TNC using Arduino with a display.

Several folks have asked about using Arduinio hardware with APRS TNC.  I don’t have a lot of motivation but figured I’d get the project started.  If you have an arduinio and would like to help develop this using arduino hardware please post (no emails please).  Here is the alpha schematic I’m working on using the display I started with in the original design.

Arduino TNC Shield
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APRS AVR C vs Processing (Arduino)

I’ve gotten ton’s of emails (100 or so) about the code for the APRS node I’ve been hacking away at.  I normally use an Arduino type board for prototyping.  However, the code is in C.  I do sometimes use processing to quick test something but generally things destined for the embedded world are in C.  Below are some projects I found related to what I am working on.  Some use the CML chips some don’t. In the low cost model I don’t use it.  I have been playing with a CML chip for digital type radios but they drive the cost up with what I am attempting to do which is build a device within the reach of just about any public safety department in volume.  And please if you don’t mind, post questions as comments rather than emailing me directly.  That ensures that any Q&A can be seen by everyone.

http://garydion.com/projects/whereavr/   – This is a really nice setup, different application but very tidy setup.

http://sites.google.com/site/ki4mcw/Home/arduino-tnc – Hope to see more from this.  Its what more of you are looking for with PDE files provided.

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APRS Display from the bench to usable in the field…

I started this project months ago with the goal of having software and hardware that could be used in the field.  I have it working on the bench and a very crude setup that I can attach to either my TM-V71a HAM radio or my LMR based TK-3180 handheld for search and rescue.  I’ll need plastic and not just any plastic but something rugged.  I plan on continuing to write more code with the crude version to add some public safety specific features as I have completed 99% of HAM related operations.  If you would like to build one of these to test with and help improve the code and hardware please let me know.   The next evolution will be a plastic housing and some redesign to make it as small and low power as possible.

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APRS AVR with Display

I’ve been testing a small display I used in a previous post for use with APRS using a AVR.  Using a simple R2R DAC for the modulation and zero cross detect seems to be working at 1200 baud in a reliable fashion.  While I have this working laying on the desk in many pieces, I’d really like to look at taking this prototype to something I can put on in my truck or better yet in my pocket. Here is where I’m headed and if anyone else has ideas, comments, etc.. post it.

ATMEGA 644  This has just enough pins to drive the display and do the I/O.  I’m trying to keep this as cheap as possible so that its easy to get into.

No external modem IC.  Zero Cross Detector and R2R DAC or small DAC IC.

Small backlit display that can display at least 4 lines of text.

Function with or without a GPS. My focus is messaging and identify who is within range of me.  One of the best things about APRS is the ability to find who’s out there. It’s not just about tracking.

Port for a ps2 keyboard.  I want to use this for messages.

Can be powered from AA batteries or 13.8VDC.

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2010 Dodge Ram 2500 HD Tips, Tricks, and Hints.

I purchased a 2010 Dodge Ram 2500 HD Laramie this weekend.   On the way home I wanted to delieve deeper into what I had just purchased and was shocked at the lack of documentation.  I had owned newer fords or older dodges so getting handed a key FOB to start the truck was a bit shocking.  They do give you a user manual and a DVD but I was unable to locate several things and figured out some more just by trial and error.  Below is a list of tricks, tips, and hints as well as some things I can’t figure out.  If you have a solution please drop me a line. Continue reading “2010 Dodge Ram 2500 HD Tips, Tricks, and Hints.”

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Rescue 3 SRT Swiftwater Rescue Technician Class SRT 1

I recently took the Rescue 3 SRT class at Haywood and Nantahala River.  It’s certainly one of the best classes I’ve taken.  Leaving the class you certainly leave with a good feeling that you can perform a swiftwater rescue.  Our class was a three day class, beginning on Saturday at Haywood community college for the classroom portion.  The next two days (Sunday and Monday) were on the Nantahala River.  Our class instructors were Rescue 3 instructors Trey Smith and AJ Bird.  I’ve taken other classes with both instructors and it doesn’t get any better, not to mention a comfort level existed, with instructors you know and trust.  If you consider taking this class, below are my recommendations based on my experience in class: Continue reading “Rescue 3 SRT Swiftwater Rescue Technician Class SRT 1”

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Wouxun KG-UVD1P A great radio for the price.

Wouxun KG-UVD1P Package

Recently I purchased a Wouxun KG-UVD1P radio.  My main reason was that it was a inexpensive radio that was part 90 certified and had VHF UHF Dual band including HAM bands.  Construction is great and it appears to be just as rugged if not more so than my TK-3180 and TK-380.   …

Continue reading “Wouxun KG-UVD1P A great radio for the price.”

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AVR – CTCSS 2 Tone and APRS AX.25 project.

Brother Toner Transfer to PCB working!!!

AX.25 encode is complete and seems to work well.  AX.25 decode works, but I have a special mode and also have a CTCSS listen setup to remotely turn on that mode.  Still some items to do , but its almost time to put this on a board.  If you are interested in this project please let me know.  I was able to get my Brother Laser printer to work with the toner transfer method after some trial and error.  I had great results using a Brother HL-4070CDW and Kodak inkjet photo paper using a iron and being very patient with the soak.

Continue reading “AVR – CTCSS 2 Tone and APRS AX.25 project.”

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AVR CTCSS Tones and 2 Tone Paging.

I have several radios that don’t have CTCSS or the ability to page out fire tones.  I figured I’d solve it with a programmable AVR.  I started with a basic Arduino board and progressed to c code to control various circuits for the generation and detection of tones.  I’ll be posting some pics and information soon.

AVR Radio Controller TNC CTCSS PL TWO TONE
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Haywood Ropes Rescue Training For March

Just FYI for anyone needing to finish up there North Carolina Rescue Technician Certifications.

Haywood Community College Rescue Academy 2010

ROPES

March 8th                                             FIP 5801 Site operations                      6pm till 11pm

March 9th, 10th, and 11th                   FIP 5802 Anchors                                   6pm till 11pm

March 15th                                            FIP 5803 Mechanical Advantage         6pm till 11pm

March 16th, 17th, 18th, and 19th        FIP 5807 Victim Management             6pm till 11pm

March 22nd and 23rd              FIP 5804 Fixed Ropes System                                 6pm till 11pm

March 24th and 27th              FIP 5805 Lowers and Raises                 24th          6pm till 11pm

27th           8am till 8pm

April 3rd                                   FIP 5806 High lines                                                    8am till 8pm

Location: Clyde National Guard Armory

The classes will be open to anyone that just needs a few classes you will be able to come in and pick them up here.

For more information contact Dee Massey @ 828- 565-4247 or dmassey@haywood.edu

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