Published by Joey Joe Joe Jr on

The Jeffrey 2.0

Welcome to my iSpindel landing page. The official iSpindel home page is also a great resource for everything iSpindel.

The Printed Circut Board (PCB)

The Jeffrey 2.0
The Jeffrey 2.0

I suggest that you purchase The Jeffrey PCB version 2.0. Please use this link to register with to get a $5 discount and give me a referral. You can check out my blog post about the development of the PCB for more information on its features.

PCB from=From pcbway

Gerber files can be found on my GitHub page.

The schematic can be viewed in detail by clicking on the image below.

The schematic for the iSpindel / Jeffrey 2.0

Parts and Assembly

If you are using The Jeffrey PCB version 2.0 by Open Source Distilling you can use the below “Shopping List.”

The Assembly video for The Jeffery 2.0 is found by clicking this link.

Please note that in my build, The Jeffrey 2.0 did NOT need additional weights added in order to get to 25° in pure water when the battery was installed at the lowest position. That being said, the ability to add weights and move the battery is still available if needed to fine turn the tilt in pure water.

If you are using iSpindel PCB 4.0 by CherryPhilip you can find use my assembly video and parts list from my blog post. Please make sure you remove the diode from the D1 mini as this step is missing from the “iSpindel PCB 4.0 by CherryPhilip” video but should be considered a required step.

Shopping List


Follow my video on how to load the iSpindel firmware.


There are different calibrations that need to happen in a specified order.

  1. Offset calibration
  2. 25 ° tilt in pure water (coming soon)
  3. iSpindel formula calibration
  4. Battery voltage calibration (scroll down)

Connecting the iSpindel to a Service for Data Logging and Reporting

There are different options around this. Ubidots is a popular choice. I’ll also be exploring the TCP/IP Server for the Raspberry Pi.

Joey Joe Joe Jr

I was born on a pirate ship off the coast of Peru where I was given a traditional Aztec upbringing, during which I excelled in the arts of sciences. At age seven my parents accidentally murdered each other in a freak fencing accident. Heartbroken I joined the tribe of Omaha, where I trained under the legendary Vin Diesel. At age eighteen, after a failed Fear Factor audition, I set out for a berry plantation roughly four kilometers south of Albuquerque. I currently reside at Ram Ranch which really rocks!


jimdkc · February 16, 2020 at 11:14 PM

Yeeee! Haaaawwww! Been waiting for this board to become available. I have most of the parts in hand and I’m itchin’ to build!

    Joey Joe Joe Jr · February 18, 2020 at 9:40 AM


      Geep · March 31, 2020 at 5:29 PM

      I’ve been sheltered in place so long I might be missing something but I don’t see a shopping list, just a link to the PCB (and is the price show there per qty ordered? Ie $20 for 5 pcBs?)

        Joey Joe Joe Jr · April 2, 2020 at 10:23 AM

        Something happened to it. I think WordPress updated and I lost my ‘reusable blocks’. Anyways, I have rebuilt the shopping list and it should now be available again. I will review the list in detail later but I had to restore from a backed-up version. If any links are broken or you run into any issues let me know and I will respond.

        Thanks for bringing this to my attention, Geep!

Chris Denney · February 17, 2020 at 1:28 PM

Great work man. I’ve been learning about the iSpindel myself and trying my best to get one working. Finally got one working last night and only JUST discovered your work today. I’m curious though, why is the 25° tilt in pure water important? Mine is tilting like 50° in pure water but it’s giving me accurate measurements after I calibrated it.

    Joey Joe Joe Jr · February 18, 2020 at 9:32 AM

    I can’t say why, but the creator of the iSpindel, universam1, has stated multiple times that 20 to 30 degrees in pure water is a requirement, not a suggestion. I’ve seen him tell someone whos’ iSpindel floats in water at about 70 degrees that he would never get accurate results until he balanced his iSpindel in pure water. It’s awesome that you are getting accurate results! I haven’t done much testing around gravity readings yet as my original iSpindel had the firmware bug where offset calibration never saved, so my readings never made sense. I will do a second round of gravity calibrations in the future testing out the easy vs actualy fermentation methods. Thanks for your reply! How close does your iSpindel tie into a traditional hydrometer?

Henrik · February 18, 2020 at 4:12 AM

Great! Good job with the pcb, I’ll make an order soon 🙂
With my last iSpindel I used an app called BrewSpy and it worked for me. Could be an option if your to compare different data services.

    Joey Joe Joe Jr · February 18, 2020 at 9:40 AM

    Thanks for sharing. Do I plan on trying different data services! I’ve seen a similar phone app before. Can’t wait to try these out 🙂

Mat from Biarritz · March 6, 2020 at 1:30 PM


I was nearly pushing the order in pcbway until I see that the pcb is Size : 133 x 34 mm

The pcb is bigger than the geocatching pet 123 x d33 that you link. It’s the one I have already.

The size of philippo is Size : 123.24 x 30.7 mm

    Joey Joe Joe Jr · March 7, 2020 at 1:54 PM

    My PCB is designed not to fit in the pelting. It has ‘tabs’ that need to be filed down in order to get a snug fit.

    Please note too that I geocaching pet dimensions, 123 x d33, I posted are straight from the vendor. When I actually measure the opening with calipers, I get slightly different values. Use this link to get the right pelting for my project.

mat · March 7, 2020 at 4:29 AM


I was nearly pushing the order button on pcbway until I see the pcb size compare to the pet container.
The pcb Size is 133 x 34 mm
The ispindel_4.0 size 123.24 x 30.7 mm
And the geocatching you list are (internal), mm
~123 x d33
Did I miss something?

Thanks for your help.

    Joey Joe Joe Jr · March 7, 2020 at 1:49 PM

    My PCB is designed not to fit in the pelting. It has ‘tabs’ that need to be filed down in order to get a snug fit.

Mat · March 8, 2020 at 8:29 AM

Thanks a lot Joey.
I will order them.

Dannys · March 10, 2020 at 4:55 AM

Can you give me scematic board ispindel?

    Joey Joe Joe Jr · March 15, 2020 at 9:05 PM

    The schematic has been added to the page 🙂 Please check it out and let me know if you have any questions.

      jaisoh · March 20, 2020 at 3:40 AM

      Any possibility to get gerbers for the board or at least outline as dxf?

      I happen to have bunch of ESP-12F modules for which I was planning to do a board design. I’m intrigued about the snug fit of the PCB inside the tube and would like to leverage the outline you have done 🙂

        Joey Joe Joe Jr · March 30, 2020 at 10:54 PM

        Hi, sorry for the late reply. Things have been crazy with the virus, this and that. I dragged my feet getting the files out but here they are. It’s my first post in Github so let me know how it goes.

      jaisoh · March 26, 2020 at 1:36 AM

      Any possibility to get the outline of the board for example in dxf? Or the board gerbers?

        Joey Joe Joe Jr · March 30, 2020 at 10:57 PM

        Hey Jaisoh,

        Yeah man, here you go. Sorry for taking so long to reply to your other comment. Let me know if you need anything else. I put up the gerbers on Github but I’m unsure about dxf file format.

Jay · March 18, 2020 at 5:46 PM

Hi, I have ordered the boards and parts. I notice the 10K resistor is no longer listed on your parts list. Is it not really needed?

Thanks for putting all this together! I bet it was some work, especially from a pirate ship.


    Joey Joe Joe Jr · March 18, 2020 at 6:06 PM

    Yes, it’s not needed. 220k is the correct resistor, the official iSpindel documentation has a typo in it stating that it should be 230k, but in reality, it should be 220k.

    That being said, you can use 220k to 230k resistor and things will be fine. Resistors usually have a 1 to 5% accuracy anyways. The resistor is used to measure the battery voltage and there is a calibration method you can do to dial the iSpindel voltage into a reading from a multimeter. I will release a video on that calibration eventually but there is a link to it was well on this page.

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