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Thread: pi connection woes

  1. #1
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    pi connection woes

    hello there!

    I would like to join the club of a successful build of a heatermeter-4.3! yesss!

    I started this project originally as I had a morbid fear of soldering - turns out soldering is fun and nothing to be afraid of (and youtube helped a lot)

    So everything is going lovely, until ... I tried putting the circuit boards into my case and things started going a little awry... Here's the story so far:

    Everything assembled, flashed, and all probe plugs worked, as well as the thermocouple tested


    Sequence of events is a little hazy at this point as I was doing victory laps. I believe it started looking like the below picture after i unplugged, and tried installing into my printed case:


    So i unplugged and plugged a few times and at one point the rasp-Pi got very hot ... #gulp.

    Reflashed sdcard and tried starting from scratch with the firmware - no love and LCD now shines brightly, but no symbols.

    I did some research on the forum and found this:
    https://tvwbb.com/showthread.php?745...aying-gibrish&

    So i disassembled and reflowed LCD header, the shift register IC and the headers.

    I assembled everything and it looks like so with the rasp-Pi plugged in (the left button changes the LED's though - so I think it's working, just nothing showing on screen):


    Buuuut, it looks like this when I have the Pi unplugged, and all plugs, buttons, etc, work again:


    So I guess my question would be where to go next from the information I have? it would seem connecting the rasp-Pi stops things from working so well.
    On top of all this the wifi doesn't seem to connect to my network - but i believe that is either related to the above problem, or a problem for another day

    Any tips hugely appreciated of course and I'm more than happy to provide more info!

    In the mean time, i will keep searching the forums and seeing what I can find. I will also try flashing something else onto the rasp-Pi to see if it's toast after it got hot

    Many thanks,
    Jeremy


    ____

    high-res photos (including each board and solder work):
    https://i.imgur.com/1Wsz3rp.jpg
    https://i.imgur.com/xMoh7wO.jpg
    https://i.imgur.com/suQ2Rlq.jpg
    https://i.imgur.com/l6lnFdx.jpg
    https://i.imgur.com/kOJWwIU.jpg
    https://i.imgur.com/oP7WArF.jpg
    https://i.imgur.com/Kg18it6.jpg
    https://i.imgur.com/cdCThTW.jpg

  2. #2
    New Member
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    Location
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    Did some more searching around and found these posts which i will follow some of the same troubleshooting:

    https://tvwbb.com/showthread.php?742...s-Immediately&
    https://tvwbb.com/showthread.php?736...with-Pi/page3&
    https://tvwbb.com/showthread.php?725...up-need-help!&

    Will also dust off the old voltmeter-thingy-ma-jig.

    Will report back any findings (good or bad!)

    cheers!

  3. #3
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    Aug 2018
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    Wellington, NZ
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    okey doke, some further testing (sick of me yet? )

    it looks like I might have done what a fellow did on here (cant find the link now) and plonked two metal parts together that i shouldn't have (possibly on the USB ports of the Pi). In doing this i fried my Pi - doh! I confirmed this by trying to load other images I've done (octopi) without any luck - it just boots up, shows some text, and then shuts down.

    I will also place some tape over the USB ports of the pi as per this thread:
    https://tvwbb.com/showthread.php?700...3-Overheating&

    my symptoms seem to be the same as this:
    https://tvwbb.com/showthread.php?736...-with-Pi/page3

    And so doing some continuity tests on the rPi header and it looks like I have continuity between RX and TX - this doesn't seem correct?
    These two:


    thank you for reading my verbal diarrhoea

  4. #4
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    Aug 2018
    Location
    Wellington, NZ
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    aaand that was it

    replaced the rPi GPIO header, replaced the raspberry-pi and ... boom!* Great success!

    this forum is a wealth of knowledge - basically every problem i hit, someone else has hit before and has been answered all lovely-like.

    now my mission is to put it into the case without frying it :P

    thanks to all you meaty hobbyists!









    * not an actual boom

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