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  1. #1
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    TXLog - an Eggfinder accessory

    The Eggfinder can be a very effective tool for locating your rocket - GPS coordinates transmitted to your handheld receiver works great. Some folks also have experience with capturing the GPS data via Bluetooth for post flight analysis. Cris @ Eggtimer Rocketry has thoughtfully designed the Eggfinder TX in such a way that it can also be interfaced with a data logging module like OpenLog, which writes data to an on-board micro SD memory card.

    When I first started playing with the OpenLog module, it simply worked; no coding or special configuration was required. I was impressed with the small footprint. My first mock-ups included a piggy back board with some short leads connecting to the TX serial connectors. It then occurred to me that a custom PCB could be mounted on the TX doing away with the wires completely.

    In a nutshell, through trial and error I came up with a simple adapter board that mounts an OpenLog module directly on an Eggfinder TX. I had some boards made, and they seem to work well. I have all that I need, and thought that other Eggfinder owners might also like an easy option to capture GPS data during the flight, while also transmitting the data to their receiver. (Important note: This only works with the current B6/B7 version of the Eggfinder TX. This isn’t designed for earlier versions.)

    You can import the flight data into Google Earth, manually look at timestamps to correlate events, etc.

    Sound Interesting?

    Effective July 2017, these are now available from Eggtimer Rocketry.

    See post #54 for additional details.

    Last edited by Worsaer; 6th July 2017 at 03:09 AM.

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  2. #2
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    Here is a photo if the commercially available OpenLog module:




    And here's the module mounted on the custom board:




    And some photos of how it all comes together...




    Last edited by Worsaer; 17th July 2017 at 01:40 AM.

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  3. #3
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    Well that's cool!
    Randy Kennedy

    L1 - Scott's Special 1 (Vlad the Impaler), CTI I345, fall 2014 (R.I.P. Apr 2015)
    L2 - Mad Dog DD (Aftershock), CTI J449, spring 2015
    L3 - 8" Fiberglass DX3 XL (Crowd Pleaser), CTI M1890, June 3 2017 (R.I.P. Sep 2017)

  4. #4
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    Would it work with the egg finder mini?
    MDRA Member
    TRA Level 2

  5. #5
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    Quote Originally Posted by Crazyrocket View Post
    Would it work with the egg finder mini?
    The adapter board is only designed to mate with the full size Eggfiner (Rev B6/B7). The Mini would require a different configuration.

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  6. #6
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    That's a very neat solution, does it even increase the height of the board?

    Price? Weight?
    QRS: 124
    AMRS: 32 L2
    Highest Altitude: 10,849 feet
    Largest Motor: CTI 1115J530 IM
    Current Projects:
    Purple Parrot, X Wing


  7. #7
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    Nice job, Bill!


    Steve Shannon
    Steve Shannon
    L3CC, TAP, Director, Tripoli Rocketry Association

  8. #8
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    Quote Originally Posted by SpaceManMat View Post
    That's a very neat solution, does it even increase the height of the board?

    Price? Weight?
    As the photo shows, the tallest components on the Eggfinder TX are the header pins. This simply slides over the existing pins, and as built, is about the same height.

    It does not require separate battery - it uses the power supplied by the Eggfinder pins.

    Weight of the entire sub assembly (including a micro SD card): 0.16 oz


    From the manufacturer of the OpenLog module:
    VCC Input: 3.3V-12V (Recommended 3.3V-5V)
    Log to low-cost microSD FAT16/32 cards up to 64GB
    Two LEDs indicate writing status
    2mA idle, 6mA at maximum recording rate


    Price: TBD - I want have some people log some flight time on them before I make them generally available. Reliability and ease of use are really important.

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  9. #9
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    Anyone flying at TCC's May launch that wants to try one out? I still have a couple of units available for testing.

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  10. #10
    Join Date
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    Dude, I'm so down for one of these toys! Logging is the only thing that the eggfinder is missing, and could make the difference for me between staying eggfinder or going MW RTX.
    ATCS(AW) Tom Keith, USN, ret. _____NAR 99781 L1_____MDRA 212
    SEVRA, NAR 621http://www.sevra.org/ Tripoli East North Carolina (Bayboro), TRA #65, http://ncrockets.org/, MDRA http://www.mdrocketry.org/
    LVL 1 24 October 2015, Leviathan, CTI H133, 2469 ft, Bayboro
    LVL 2 Soon, Super DX3, AT J420 Redline, est 3500 ft, Bayboro or MDRA

  11. #11
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    Quote Originally Posted by Banzai88 View Post
    Dude, I'm so down for one of these toys! Logging is the only thing that the eggfinder is missing, and could make the difference for me between staying eggfinder or going MW RTX.
    Your choice should be based upon whether you need the 250mW Rf output from the Missileworks, can deal with the larger footprint of the MW product with the ability to record the
    positions.
    GPS Rocket Locator can save a log but one has to manually deal with it so it's not that easy with the EF. The expressed purpose of the EF was to find rockets. It shouldn't be
    considered a telemetry system by any stretch of the imagination. The EF does the job of finding most rockets nicely though.
    One is best served if they can weigh their needs to each device in question and base their decision on that. Kurt

  12. #12
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    This is datalogging, not telemetry. A lot of people like to see the GPS trace... I wish I had it from my Double Shot flight that drifted 5 miles downrange and over a hill. It's very easy to get this data out of an OpenLog, since it's just an NMEA data file. Put your uSD card into an adapter and stick it in your laptop, open the file up with Google Maps, and there you go.

    Technically, any data that you send out via radio is telemetry: GPS data, altitude, deployment channel status, etc. (Gee, that sounds a lot like the TRS. ) It could be argued that a beacon locator is telemetry too, it's sending out a "I'm alive" beep which can be used to find the rocket by inference (I see you're alive and your signal is coming from "there" and it's "this" strong so you must be "that" far away).

  13. #13
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    I stand corrected but both units do telemeter the data strings. The issue is capturing the strings through the vagaries of Rf propagation, transmitted power and antenna polarity.
    Data logging overcomes this except that one must find the rocket to have at the on board data. True, with GPS the chance of recovery is much higher than without but bottomline
    is one has to get the rocket back for that.

    If one can plot the telemetered strings reliably, that goes a long way to establish a trend line to assist with a recovery that goes out of radio tracking range. True, most sport flights don't go to that extreme so plotting is not really necessary for a reliable recovery. Sure helps with a main at apogee and one has to go on a chase scenario. Kurt

  14. #14
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    From my perspective, more data is always a good thing. Having data from multiple altimeters, GPS, etc, can present an interesting perspective of the flight. Yes, this assumes you have found the rocket.

    Thinking of Matt's now infamous L3 flight as an example, after locating the rocket he would have had data to tell if the eggfinder shut down ( perhaps due to the battery dropping below an acceptable range) and when that occurred. I also hear of flights 'losing lock' on the ascent. The data would be interesting to look at to better understand what the GPS saw during the flight. The NMEA sentences contain a wealth of data. I don't think I would rely on altitude readings, but 'speed over ground' could tell you a lot about less than vertical flights, winds aloft, etc.

    Did I say I like data? <grin>

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  15. #15
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    I like the the memory card, stick it in a laptop after your flight. Personally, I would use it a lot with the ability to have all that data in one spot. I never remember how to use the putty terminal program.

    Will it work with the TRS and the Mini?
    Last edited by Rob702Martinez; 15th May 2017 at 03:34 PM.
    TRA Las Vegas, L2

  16. #16
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    Quote Originally Posted by Worsaer View Post
    From my perspective, more data is always a good thing. Having data from multiple altimeters, GPS, etc, can present an interesting perspective of the flight. Yes, this assumes you have found the rocket.

    Thinking of Matt's now infamous L3 flight as an example, after locating the rocket he would have had data to tell if the eggfinder shut down ( perhaps due to the battery dropping below an acceptable range) and when that occurred. I also hear of flights 'losing lock' on the ascent. The data would be interesting to look at to better understand what the GPS saw during the flight. The NMEA sentences contain a wealth of data. I don't think I would rely on altitude readings, but 'speed over ground' could tell you a lot about less than vertical flights, winds aloft, etc.

    Did I say I like data? <grin>
    In Matt's case, the strings would have just stopped and one might be able to know when that happened. It's moot because it's known that happened by using
    a single 1S battery. Kurt

  17. #17
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    Quote Originally Posted by ksaves2 View Post
    In Matt's case, the strings would have just stopped and one might be able to know when that happened. It's moot because it's known that happened by using
    a single 1S battery. Kurt
    Is it truly known, or just assumed? Certainly it's likely.


    Steve Shannon
    Steve Shannon
    L3CC, TAP, Director, Tripoli Rocketry Association

  18. #18
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    Quote Originally Posted by Rob702Martinez View Post
    I like the the memory card, stick it in a laptop after your flight. Personally, I would use it a lot with the ability to have all that data in one spot. I never remember how to use the putty terminal program.

    Will it work with the TRS and the Mini?
    This particular board is sized for the TX B6/B7 versions, but you can connect an Openlog to any of the Eggfinders and the TRS; you just need to solder 3 wires. I'm working on a document for that...

  19. #19
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    Quote Originally Posted by cerving View Post
    This particular board is sized for the TX B6/B7 versions, but you can connect an Openlog to any of the Eggfinders and the TRS; you just need to solder 3 wires. I'm working on a document for that...
    The big question unasked , 'Will this void the warranty ??'

    Kenny
    Fiesta Area Rocket Team - San Diego, CA

    TRA# 01113 L3, NAR # 38484 -DART, NAR Section #317
    GHS 2011 PB-X ROCstock XXXV GHS 2012 PB XI ROCstock XXXVII PBXII SPRINGFEST 2014 ROCstock XXXIX Oktoberfest 2014 LASTER Blaster ROCstock XL SPRINGFEST 2015 ROCstock XL1 ROCtober Oktoberfest 2015 LDRS XXXV ROCstock XLIII Holtville HAVOC Springfest 2017 --> ROCstock XLIV :dark:

  20. #20
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    Quote Originally Posted by KenRico View Post
    The big question unasked , 'Will this void the warranty ??'

    Kenny
    LOL, of course not. However, there are six ways to connect 3 wires to 3 pads, and only one of them is going to work...

    Just in case you can't wait, here's how you hook one up, for any Eggfinder or TRS version. On the RF module pads from left to right, solder wires to the OpenLog as follows:

    First pad - +3.3V (VCC) on the OpenLog
    Third pad - GND on the OpenLog
    Fourth pad - RXD on the OpenLog

  21. #21
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    Quote Originally Posted by KenRico View Post
    The big question unasked , 'Will this void the warranty ??'

    Kenny
    What warranty? And when will it be available as a kit? The open logger is $12.95 to $14.95 so add the custom board, header pins and jumper and good to go. Kurt

  22. #22
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    Quote Originally Posted by ksaves2 View Post
    What warranty? And when will it be available as a kit? The open logger is $12.95 to $14.95 so add the custom board, header pins and jumper and good to go. Kurt
    ... don't forget he Micro SD card.


    More info available this weekend.

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  23. #23
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    want... NEED... take my damn money NOW!

    i love this community!!
    "That Crazy Brit"
    - - -
    Team Numb
    -exploring the possibilities-
    L3 - TRA 13815 - NAR 87999

  24. #24
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    Quote Originally Posted by Worsaer View Post
    ... don't forget he Micro SD card.


    More info available this weekend.
    Got a bunch of those lying around already. 4gb enough for a flight or two? Kurt

  25. #25
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    Quote Originally Posted by ksaves2 View Post
    Got a bunch of those lying around already. 4gb enough for a flight or two? Kurt
    At about 150 bytes/sec, a 4 GB card is good for about 7400 hours of recording. That's about 44 weeks of continuous recording. Yeah, it's long enough...

  26. #26
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    Any chance Cris will be stocking these? I hate paying extra shipping.
    QRS: 124
    AMRS: 32 L2
    Highest Altitude: 10,849 feet
    Largest Motor: CTI 1115J530 IM
    Current Projects:
    Purple Parrot, X Wing


  27. #27
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    Talking with Chris now about getting set up. Would love to incorporate this.
    Mike
    NAR #86177
    TRA #16435
    L1 with Loc Precision H76 Vulcanite on H73J (2,109') 7/23/06
    L2 with Binder Design Velociraptor on K695R (6,171' @ 716mph) 9/20/15
    L3 with Polecat Aerospace 10" Nike Smoke on M2500T (6,468' @ 556mph) 11/26/16 (RIP 5/26/17 )

    Current Projects:
    Waive Goodbye (design around 18k waiver)

  28. #28
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    If you are interested in obtaining one, more information is available here.


    5/20/17 Update: I have a few units available, with more to follow. Please use the email address in the above link for questions or to place an order.
    Last edited by Worsaer; 21st May 2017 at 02:11 AM.

    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


  29. #29
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    email looks confusing at that link with the dashes. Is that what it is? Kurt

  30. #30
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    Quote Originally Posted by ksaves2 View Post
    email looks confusing at that link with the dashes. Is that what it is? Kurt
    Thanks Kurt - I cleaned it up. You should now see the updated email address.


    -Bill Riley

    TRA: 12294
    NAR: 89196

    A good rule for rocket experimenters to follow is this: always assume that it will explode.
    — Astronautics, issue 38, October 1937.


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