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  1. #61
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
    Posts
    2,659
    Flash memory is written in sectors, much like rotating disk memory. Whether you write one byte or 512, you're writing the entire sector. If something interrupts that process, you'll lose the sector. An Eggfinder sends around 100 bytes per second, so you'd potentially lose 4 or 5 seconds, and if that data spans multiple sectors you could potentially lose more. Maybe the card jiggled loose... we recommend that you tape it in with some good masking tape (not the low-tack blue/green stuff).


  2. #62
    Join Date
    21st December 2013
    Location
    Australia
    Posts
    480
    Quote Originally Posted by cerving View Post
    Flash memory is written in sectors, much like rotating disk memory. Whether you write one byte or 512, you're writing the entire sector. If something interrupts that process, you'll lose the sector. An Eggfinder sends around 100 bytes per second, so you'd potentially lose 4 or 5 seconds, and if that data spans multiple sectors you could potentially lose more. Maybe the card jiggled loose... we recommend that you tape it in with some good masking tape (not the low-tack blue/green stuff).
    i suspect that the issue was my daughter powered down the entire RX with everything running - Bluetooth and logger. Apparently because I had no labels on the switches she thought she would find out what they do. The PC got upset about it so I gave up on it and thought I'll just fall back on the logger to get data. I think at that stage however the data card was corrupt and not recording anything. But just to be sure my son also decided that he would find out what they do . So between them they managed to make the thing unhappy. Fortunately not a critical flight but I'll be making a few adjustments to try and prevent these issues.

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


  3. #63
    Join Date
    12th April 2015
    Location
    Arizona
    Posts
    303
    Just set mine up. However, after running for ~5 minutes, no log file is created. The Eggfinder works (verified I was getting signal on the receiver) and the SD card has a config file, but no log file.

    Any ideas?
    I aim at the stars. But sometimes I hit London.

    NAR #99868
    L1: MDRM on CTI H175, 7/26/2015 @ NARAM 57
    L2: "Flugel der Freiheit", AT J420R, 11/4/2017 @ GHS Memorial

  4. #64
    Join Date
    11th January 2012
    Location
    Commonwealth of VA
    Posts
    1,604
    Quote Originally Posted by Oberon View Post
    Just set mine up. However, after running for ~5 minutes, no log file is created. The Eggfinder works (verified I was getting signal on the receiver) and the SD card has a config file, but no log file.

    Any ideas?
    Is the LED on the OpenLog module flashing? It should log entries almost immediately after powering up. It does not need to obtain GPS lock to write to the log.

    -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.


  5. #65
    Join Date
    22nd January 2017
    Location
    North Florida
    Posts
    46
    Did you buy the OpenLog module from Cris (Eggfinder)? I tried it with one from Ebay and it didn't work, same problem as you. I think the one bought was set with the wrong bit rate to work with the Eggfinder.

    Quote Originally Posted by Oberon View Post
    Just set mine up. However, after running for ~5 minutes, no log file is created. The Eggfinder works (verified I was getting signal on the receiver) and the SD card has a config file, but no log file.

    Any ideas?
    -Dave
    -----------------------
    NAR# 103244
    Level 1 - PML AMRAAM 2
    Level 2 - Madcow Adventurer 3

  6. #66
    Join Date
    11th January 2012
    Location
    Commonwealth of VA
    Posts
    1,604
    If you could post the content of the config file, that may tell us if it needs to be changed.

    -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.


  7. #67
    Join Date
    12th April 2015
    Location
    Arizona
    Posts
    303
    Just needed to turn it off and on again a couple times! Chris' instructions indicated there might be an initial setup, but I had already power cycled it once. For whatever reason, one more off and on again did the trick.

    The instructions didn't make it quite clear that there were two green LEDs on the underside of the GPS log. Once it was working it was obvious.

    It's been fine since then, need to try it a couple more times on flights. First flight I got no data because the card popped out when the rocket tipped over while I was loading it on the pad, and I didn't notice until I got it back. Second one stayed in (tape) but didn't get many good points on the way up (really good data on the walk to the pad and for the last ~20 seconds of descent, but must have partially lost lock or something on the up. Used GPS cockpit to convert and Google Earth to view.
    I aim at the stars. But sometimes I hit London.

    NAR #99868
    L1: MDRM on CTI H175, 7/26/2015 @ NARAM 57
    L2: "Flugel der Freiheit", AT J420R, 11/4/2017 @ GHS Memorial

  8. #68
    Join Date
    11th January 2012
    Location
    Commonwealth of VA
    Posts
    1,604
    Glad to hear it.
    Yes, it’s pretty normal to lose lock on the way up. Google earth will plot the launch pad, then the point at which lock is regained, and then the descent. Sometimes you may have some ‘noise’, in the form of invalid coordinates as it’s regaining lock. It’s easy to delete those lines from the text file, giving a much cleaner Google Earth view.

    -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. #69
    Join Date
    11th January 2012
    Location
    Commonwealth of VA
    Posts
    1,604
    For anyone interested in more detail about configuration, troubleshooting, etc., here’s a useful link:

    https://learn.sparkfun.com/tutorials...92290#firmware

    -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. #70
    Join Date
    19th June 2017
    Location
    Austin TX
    Posts
    62
    Did I read that this will/can work with the Mini as well?


    Sent from my iPhone using Rocketry Forum
    NAR 102867
    L1 06/2017
    L2 08/2017

  11. #71
    Join Date
    11th January 2012
    Location
    Commonwealth of VA
    Posts
    1,604
    Quote Originally Posted by BryRocket View Post
    Did I read that this will/can work with the Mini as well?


    Sent from my iPhone using Rocketry Forum
    Nope, the adapter only fits the full size board, versions B6/B7. Cris’s most recent version accepts the OpenLog module without needing the adapter board.

    -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.


  12. #72
    Join Date
    19th June 2017
    Location
    Austin TX
    Posts
    62
    I guess I was asking if you could just wire an OpenLogger to the Mini. Not necessarily via an adapter or attachment.


    Sent from my iPhone using Rocketry Forum
    NAR 102867
    L1 06/2017
    L2 08/2017

  13. #73
    Join Date
    19th June 2017
    Location
    Austin TX
    Posts
    62
    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...
    I was referring to this.


    Sent from my iPhone using Rocketry Forum
    NAR 102867
    L1 06/2017
    L2 08/2017

  14. #74
    Join Date
    11th January 2012
    Location
    Commonwealth of VA
    Posts
    1,604
    Quote Originally Posted by BryRocket View Post
    I was referring to this.


    Sent from my iPhone using Rocketry Forum
    Yep, I understand. If you look at the documentation for the Hope RF module and OpenLog, you can simply map the appropriate pins. I have not experimented with one yet.

    -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. #75
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
    Posts
    2,659
    You can connect an OpenLog directly to the programming header on the Eggfinder Mini. Connect the two power pins on the OpenLog to the appropriate power pins on the Mini, and connect the RXD pin to RXD on the OpenLog.

  16. #76
    Join Date
    19th June 2017
    Location
    Austin TX
    Posts
    62
    Quote Originally Posted by cerving View Post
    You can connect an OpenLog directly to the programming header on the Eggfinder Mini. Connect the two power pins on the OpenLog to the appropriate power pins on the Mini, and connect the RXD pin to RXD on the OpenLog.
    Thanks Cris!


    Sent from my iPhone using Rocketry Forum

    NAR 102867
    L1 06/2017
    L2 08/2017

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