Liquid filled DS18B20 temperature probe

thingiverse

This is a liquid-filled temperature probe designed for kegerators, keezers, or any refrigerator where you want to track the liquid temperature instead of just the air temperature inside the fridge, which can swing high and low significantly with compressor cycles. It uses a common digital temperature probe, the DS18B20, in a waterproofed stainless package. If you're an Arduino enthusiast, you know exactly where to find these probes. For the liquid tube, I'm using a cleaned-out White Labs yeast vial that's commonly found among home brewers who have them lying around everywhere! The first part holds the actual vial, which can be double-sided taped to the wall in your kegerator. The second part keeps the temperature probe suspended in the liquid, so it's not touching the side walls. I'm using a solution of about 50% vodka and water just to keep it from icing up when temperatures are hovering near freezing. Please let me know what you think in the comments. I'm unsure about the long-term effects of alcohol on PLA, whether it will dissolve it or not. 2 years and a half later, there's no sign of dissolving the spacer inside the vodka solution, so I believe we can call this one successful! This is not a food-safe application; remember that the alcohol solution is self-contained in the vial strictly for measuring temperature and is not consumable. I've included the original SketchUp files in case you want to edit them. Enjoy printing! Printer Settings: Brand: RepRap Printer: Wanhao i3 clone (Monoprice version) Rafts: Yes Supports: No Resolution: 0.2mm Infill: 15%