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Hey Neal - If you have access to an old Mac that someone has pitched, there are numerous temp sensors inside that can be read by an Aruidno using I2C and linked together (using only one connection). Let me know if you want more info - I would have to find the code.
These sensors will adhere directly to the motor and are very small.
You can actually go MUCH cheaper using 100K Thermistors (~$3US for 5 on ebay) and a lower end Arduino like a Trinket/Mini Pro (~$2 - $8US).
The DS18B20 are good for environmental temperatures (weather stations, water temps… etc) but not so good when you want to stick them to something… Thats why 3D printers use Thermistors to control their hotends and heated beds.
You can actually just buy the ones for 3D printers…
Then tape them onto the stepper motors with some Kapton tape. (it will look nicer then zip ties )
Your looking at under $20US for the sensors, Arduino and LCD.
I have an Arduino mega from before and 3 Nokia 5110 screens…
Ideally I would like a screen over each of the axis plugs, I know you can parrallel connect these screens,
I will experiment with the wiring and the coding when i get around to it.
Yah those would be great to make a sous vide machine! Thermisters are cheap and easy, though you will never get an accurate reading without painstaking calibration along a curve of widely varying temperatures. TMP75’s are free if you can cannibalize a dumpster mac and are I2C and very accurate. Not to be confused with TMP36’s which are analog and only marginally better than a thermister.
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