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iSpindel Digital Hydrometer

Discussion in 'Electronics, Hardware & Software' started by Mattrox, 11/5/17.

 

  1. bevan

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    Posted 5/11/17
    I used the sled from post #1, the tinkercad one I think it is. This fits loose in the XXL bottle from eBay. I added a little bit of padding on each side and it sits nice and snug
     
  2. Engibeer

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    Posted 5/11/17
  3. kaiserben

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    Posted 6/11/17
    I'm seeking a bit of advice from anyone who has set one up already.

    My calibration angle in tap water was 23.32°

    I made up a 1.084 SG sugar solution and pitched yeast into that. Initially the iSpindel angle was ~58°. All good at that stage.
    I pitched some SO4 and noticed fermentation activity, krausen etc. 24 hours after first pitching yeast I notice that the angle has actually increased by ~5° to be ~63°. It's only gone back down a few degrees since then. So how on earth do I take this rise in angle into account for calibrating? A bit hard to get it accurate with a 5° discrepancy for the starting gravity of 1.084.
     
  4. Moad

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    Posted 6/11/17
    I don’t think they are very accurate for various reasons. I’ve seen this as well and I don’t know why.

    I won’t be using mine to change temps as it is not accurate but it does give you a decent idea of where the ferment is up to based on the graph. You’ll at least know when your ferment is done and be able to take one sample to take FG rather than a few along the way
     
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  5. Uyllii

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    Posted 7/11/17
    I have only done one brew with mine but I found the readings to be very stable.

    This is my tilt angle curve (I haven't calibrated it properly yet so just no SG on this) , the biggest blips were less than 1% apart from the cold crash. Of note are the hydrometer readings (taken from the tap at the bottom of my plastic fermentation vessel), both of them caused a drop in angle (possibly from pressure drop in the fermenter after taking a 100ml sample?). Also the dry hop addition caused an increase in angle (I think I bumped the iSpindle)
    upload_2017-11-7_12-32-18.png
     
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  6. fungrel

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    Posted 7/11/17
    Dry hopping introduces fermentables in the form of glucose and enzymes contained in the hops. I recent talk from Yakima Farms at home brew con talked about this.
     
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  7. Uyllii

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    Posted 9/11/17
    That is interesting. Does that mean I should be leaving it longer to ferment before cold crashing after dry hopping. I always assumed that hop oils were unfermentable and usually cold crash and fine one day after adding them so I get a total of 3/4 days dry hopped before kegging.
     
  8. fungrel

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    Posted 9/11/17
    Uyllii likes this.
  9. JF99

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    Posted 13/11/17
    Hi, some options to consider:

    • Replace you reed switch with a Capacitive Touch sensor (TTP223B). This works through some surfaces. It can be connected to the RST to reset the Wemos, or as a general purpose switch. So device is 100% sealed, but with touch sensistive switches :)
    • If you never want to open it again I suggest you put the Wemos into "deep sleep" mode. In this mode is uses virtually no battery. Depending on your battery quality, could last for years. The Wemos can be scheduled to wake every hour or so and grab a sample. This reduces battery consumption enormously, and no need to worry about LEDs, as they will be mostly off.
    Small TTP223B: https://www.aliexpress.com/item/10P...lgo_pvid=85d13aeb-a47d-4473-bb27-1c7a148f045a
     
  10. Moad

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    Posted 13/11/17
    the cheapo wireless chargers work a treat, I just run them all the time and charge when out of the fermenter.
     
  11. aussiechucka

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    Posted 21/11/17
    Just let people know. I have none of the spares left. The boards I still have and will post out with the resistors. $2 each board and $1 for postage.
     
  12. Dwayne Dibley

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    Posted 29/12/17
    The link to the stli on post 1 does not work. I ran a few of the stl files through the quote mechanism on 3D Hubs and they all error for PLA with some walls too thin for FDM printing.
    Anyone know where you can buy a kit of parts? Might be just as cheap when multiple shipping charges are factored in (I'm in Canada btw).
     
  13. nfragol

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    Posted 1/1/18
    Hi Dwayne, have a happy new year.
    Maybe you may want to take a look at this eshop (https://www.3d-mechatronics.de/en/ispindel-diy-set_151.html).
    That is where I got my kit from. Everything needed is supplied except a 20 gram counterweight that might also be needed.
     
  14. Dwayne Dibley

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    Posted 1/1/18
    Thanks for the link and happy new year.
    What do those of you who sourced the parts yourself reckon you ended up paying for the finished ispindle ? Just wondering what the saving would be over buying the kit in the above link.
    I'm planning on getting 2 or 3. Which would cost $120-180 CAD +shipping and possibly duty.
     
  15. Uyllii

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    Posted 3/1/18
    My costs are not the cheapest possible. Diodes, resisters and battery were from local shops (ie 200% markup) and wireless charger was local stock off ebay (50% markup). Rest was from ebay/aliexpress and all includes shipping. AUD but not far from CAD

    Code:
    Temp Probe        1.85
    PET Bottle        3.87
    Gyro              1.35
    Sled              5.63 (13.03 + 9.50 shipping for 4 sleds)
    LiPo Charger      0.53
    LiPo Battery      8.90
    Wemos D1 Mini     3.99
    Resistors         0.96
    Diode             1.50 (replaced reset resistor)
    Switch            1.95 (tilt - replaced toy switch)
    PCB               1.49 (7.45 for 5)
                     =====
                     32.02
    
    Optional:
    Switch            2.75 (magnetic reed - replace Wemos reset)
    Wireless Charger  7.99
                     =====
                     42.76
     
  16. aussiechucka

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    Posted 15/1/18
    Hi Everyone,
    I have sold out of the boards.
    Still yet to build the ones I bought. Hope I have helped some people out to get started.
    Cheers
    Chucka
     
  17. Zorco

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    Posted 18/1/18
    Great project man
     
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  18. kingo102

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    Posted 7/2/18
    Was keen to make a glass version of this. Anyone endeavoured to source a suitably sized glass test tube or similar?
     
  19. Paiakan

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    Posted 9/2/18
    Just my 2 cents (and maybe I'm wrong)
    I was thinking about this and still not sure if it's a good idea. Glass is much heavier than the plastic tube so the rate of angle variation / gravity will be smaller than in the plastic one.

    As a conclusion you will have a device that can measure gravities over 1.100 but will lose a lot in terms of resolution.
     
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  20. nfragol

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    Posted 22/2/18
    Hi guys, just build my ispindel and ran it through 2 calibration tests. It seems to be working fine but after each calibration, i test it again in plain water and keep getting a sg reading of 1.003 both times.
    Cant seem to get it to 1.000. I did make a variable in ubidots though that subtracts the extra .003 but dont know if i should be doing that.

    Does anybody know how to make a variable in ubidots that can show ABV value as fermentation progresses ?
    Or anyway of grabbing only the initial reading of OG ?

    Thanks
     
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