Welcome to my iSpindel landing page. The official iSpindel home page is also a great resource for everything iSpindel.
What is an iSpindel?
An iSpindel is a digital hydrometer for measuring the specific gravity (or degrees Plato) of something you are fermenting. It connects to web services and uploads statistical information. The web service you connect the iSpindel to can graph the temperature and fermentation statistics without you having to physically disturb the fermenter. The iSpindel can work from inside a fridge or even a stainless steel fermenter.
The Printed Circut Board (PCB)
I suggest that you purchase The Jeffrey PCB version 2.1. Please use this link to register with PCBWay.com 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.
The schematic can be viewed in detail by clicking on the image below.
Parts and Assembly
If you are using The Jeffrey PCB by Open Source Distilling you can use the below “Shopping List.”
The Assembly video for The Jeffery is found by clicking this link. This video can be used to assemble any version of The Jeffrey PCB.
Please note that in my build, The Jeffrey 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. To see how to balance the iSpindel check out my video 25° angle 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.
- The Jeffrey PCB version 2.1. Please use this link to register with PCBWay.com to get a $5 discount and give me a referral.
- Wemos D1 Mini with Deep Sleep. Amazon link. eBay link.
- DS18B20 Temperature Sensor. Amazon link. eBay link.
- BAT43 Diode. Amazon link. eBay link.
- 4.7K ohm resistor. Amazon link. eBay link.
- 220K ohm resistor. Amazon link. eBay link.
- TP4056 USB C – 6 pin. Amazon link. eBay link.
- GY521 MPU-6050 Module 3 Axis Gyroscope. Amazon link. eBay link.
- Toggle Switch. Amazon link. eBay link.
- Surface Mounted 18650 Battery Holder. 1 pc – Amazon link. 1 pc – eBay link.
- 3.7V 3400mAh 18650 Lithium Battery. Amazon link. eBay link.
- Please note that I have not fully tested my batteries so I cannot recommend one battery over another. Please buy batteries at your own risk!
- 5 XL BIG PET Soda Bottle Container. 5 pcs eBay link.
- Soldering Iron Kits with solder and clippers. Amazon link.
There are different calibrations that need to happen in a specified order.
- Offset calibration
- 25° angle in pure water
- iSpindel formula calibration
- Battery voltage calibration (scroll down)