Eggtimer Quantum

Discussion in 'Rocketry Electronics and Software' started by tOD, Oct 14, 2019.

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  1. Dec 24, 2019 #31

    tOD

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    Oh well. Celebration was a little premature. Hooked up some e-matches to conduct a deployment test and at first it looked good. Connected to the Quantum and brought up the test page. Entered the validation code to test the drogue channel, but didn't get a countdown. Exited everything and now I can't connect to the Quantum anymore.
    (Sigh) Maybe after the holidays I will order another kit and start over.
     
  2. Dec 24, 2019 #32

    g.pitts

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    Don't give up! It's likely a solder connection somewhere. This is where a close inspection of your solder joints is important. Solder should be nice a shiny where you want it, and shouldn't be anywhere else (bridging).
     
  3. Dec 24, 2019 #33

    Voyager1

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    No, don't give up!

    If possible, post a couple of high resolution images of both sides of the Quantum. Many pairs of eyes might help out here. Try to get as much solder joint detail, particularly around the wifi module.
     
    Last edited: Dec 24, 2019
  4. Dec 24, 2019 #34

    cerving

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    If you don't have one, you need to get a 10x jeweler's loupe to inspect the solder joints. You'll find things that you won't find with a 3x magnifier.

    Most deployment/continuity issues with the Quantum (and Eggtimer Classic, Quark, and TRS too) are optoisolator issues. It's VERY easy to get solder on top of the leads and miss the pads on the PC board.

    Eggtimer Cris
     
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  5. Dec 25, 2019 #35

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    Here's some pix of the board. It still beeps at power up, and the LED on the WiFi module flashes once, but my phone no longer recognizes it. IMG_20191224_210519.jpg IMG_20191224_210540.jpg
     
  6. Dec 25, 2019 #36

    g.pitts

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    The good news is that I did not see anything obvious. It's hard to tell for sure due to glare and shadows, but there were a few areas that I might recommend checking closer and potentially touching up. For touching up an existing solder joint, as someone previously mentioned use the iron on the pin/pad and heat the existing solder joint up so that it the solder is molten. Then apply a small amount of additional solder. Remove the solder, then remove the iron from the joint and allow things to cool. Be careful to not overheat the component you're soldering or end up with a solder "blob" (how's that for a technical term!), as that is something you really don't want. My philosophy of soldering is that I do not want to see any naked pad area. I noticed some on the top-side of your WiFi module. I typically will ensure that the entire pad is covered with solder. Likely they're fine, but it would eliminate any potential gotchas of a solder joint that is iffy.

    IMG_20191224_210519.jpg IMG_20191224_210540.jpg
     
  7. Dec 25, 2019 #37

    Voyager1

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    Have you tried another phone, ipad, laptop or desktop PC? You did mention earlier that the connection issue appears to be when you're at home - have you tried it again away from home? Additionally, I notice in your previous wifi web page image that you are using firmware version 1.06Q - there is now a version 1.07A. Try re-flashing with the new firmware. I'm not suggesting that this is your problem, but it's worth a try.

    I agree with this. There are quite a few solder joints that don't appear to have flowed very well and might not be solid connections. However, as mentioned above, it is difficult to be really certain due to the lighting shadows and glare off some connections in the images.

    As Cris mentioned, you will benefit from viewing these joints with a higher magnification.
     
    Last edited: Dec 25, 2019
  8. Dec 25, 2019 #38

    tOD

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    Ok. I'll check the directions on updating the firmware, I have a cable.
    Meanwhile last night I rebooted my phone and I'm now able to connect to the Quantum again. Once it was connected I opened an incognito tab in Firefox and was able to load the test page. Now I need to remount this thing in my AV bay and carry on with the deployment test. My patience is being sorely tested, but I will soldier on.
     
  9. Dec 25, 2019 #39

    Greg Furtman

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    Maybe that should be I will solder on. ;)
     
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  10. Dec 25, 2019 #40

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    Stopped connecting again
     
  11. Feb 16, 2020 #41

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    Here's the latest episode in the continuing story of the Quantum. I had it working and performed a test with real e-matches and both channels worked. I was pretty psyched and planned a full deployment test with live charges. Since then I haven't been able to connect to the device again. So. I ordered another one and I'm going to start on it using the Hakko FX888 soldering station one of my daughters bought me for my birthday. Unboxed it and installed a T18C-08 tip. gpitts had recommended a tip temperature of 600-650 so I'm going to set up for that and hack away at this thing. Meanwhile I ordered another E-bay kit from SMT designs and if I don't have any luck with the new Quantum I've got an RRC2+ from MissileWorks that I'll be using along with a Quark(which is working). I want to fly the rocket at Red Glare in April, and time is running out.
     

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  12. Feb 16, 2020 #42

    g.pitts

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    Nice looking setup. I keep my iron between 635 and 650 Fahrenheit. The higher temperature works well for soldering connectors with significant thermal mass. The lower temperature works well for everything else.

    Best of luck to you on this build!
     
  13. Feb 16, 2020 #43

    tOD

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    Thanks. I'll dial the temp back a little. This is much better than the pencil iron I was using. Here's the progress so far. I haven't made joints this nice since '72:ghosty:
     

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  14. Feb 16, 2020 #44

    g.pitts

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    LOL!

    Very nice! Keep us apprised on the progress and outcome!
     
  15. Feb 17, 2020 #45

    tOD

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    Might have been a case of "Get the right tool for the job", but my second Quantum seems to be working. I'll try reworking the original again with the new soldering station and see if I can get it to work. IMG_20200217_121610.jpg IMG_20200217_121610.jpg
     

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  16. Feb 17, 2020 #46

    g.pitts

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    That’s great! Looks like you are on the right track.
     
  17. Feb 17, 2020 #47

    tOD

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    I'm glad it's in an SMT Designs e-bay that has the slide switches to interrupt power to the altimeters. It's compliant with the rules bomb that Tripoli just dropped.
     
  18. Feb 18, 2020 #48

    cerving

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    I would suggest that you break the DEPLOYMENT power, not the power to the Quantum itself. Slide switches can bounce, so that minimizes the effect of the bouncing... it's less likely to be an issue on the way "down".
     
  19. Feb 18, 2020 #49

    rharshberger

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    SMT's slide switch configuration uses a screw to push against a momentary closed slide switch, to lock it closed, I have a hard time seeing how it can bounce. However a regular slide switch with nothing to lock it in the on position I can totally see bouncing being possible.
     
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  20. Feb 18, 2020 #50

    Steve Shannon

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    I agree, the SMT design makes it unlikely, but If you look at the amount of force required to open a slide switch and the weight of the actuator, you’ll find that it takes a lot of acceleration to make them bounce in any case. Plus, most commercial switches have certain amount of hysteresis built into them to prevent opening even if the actuator bounces a small amount.
    The NKK CS slide switches have a 50 gee force rating.
     
  21. Feb 18, 2020 #51

    Greg Furtman

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    :rolleyes: MrNaturalRightTool.jpg
     
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  22. Feb 18, 2020 #52

    tOD

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    Haha! I used to have that R. Crumb on the wall of my cube at my last job.
     
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  23. Feb 18, 2020 #53

    tOD

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    I would agree, however, that interrupting power between the battery and the igniters is the safest way to go. It also seems like it would be the most difficult to implement, especially with redundant charges. Seem like you would need 4 sets of contacts
    I have used the SMT Designs 38mm bay without any problems. I'm sure there are many flying successfully.
     
  24. Feb 18, 2020 #54

    Greg Furtman

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    Last edited: Feb 19, 2020
  25. Feb 19, 2020 #55

    cerving

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    Not necessarily, almost all deployment computers either have a battery common to the igniters (the logical place to add a single break) or power to the deployment circuitry that can easily be disconnected (most Eggtimer altimeters). One "switch" per altimeter cuts the power.
     
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  26. Feb 19, 2020 #56

    tOD

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    Had a little time to go over a few of the solder joints on the original Quantum and it seems to be working again. I'm going to re-re-re-re-install it in the AV bay and see if I can do a deployment test this weekend. We're supposed to have nice weather.
     
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  27. Feb 19, 2020 #57

    Greg Furtman

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    Again Mr. Natural was correct. ;)
     
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  28. Feb 19, 2020 #58

    tOD

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    MNPC.167.B.gif
     
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  29. Feb 23, 2020 #59

    tOD

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    I used the original Quantum to do a deployment test today. 3" Wildman Darkstar, 1.8g FFFFg. Last night ordered a CTI 54mm J210 Classic for the maiden flight. Quantum triggers drogue at nose over, main at 600. Quark backup; nose over+1, main at 500. About 9lbs. without the motor. ThrustCurve estimates about 3600'. I've got a launch opportunity coming up on 3/15. May wait for Red Glare in April to fly on a bigger field. IMG_20200223_125432.jpg
     
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