/diy/ - Do It Yourself

>>1479790
The stainless thermocouples are fairly pricy, they're used in kilns and other high-temperature applications. Now that I think about it, a glass diode package is probably fairly food-safe, provided the tin plating is present and clean. But butter could presumably short the two leads, leading to a false measurement.

I'd like to have the butter itself sitting atop a thin piece of stainless with a TEC under it and a heater somewhere too. Since the cooling will come from underneath, and the heating will probably come from above, the butter will keep for longer by way of being soft enough to spread at the top but refrigerated at the bottom. But this requires that I have a temperature sensor at the bottom and at the top. Bottom is fairly easy if I get the right sensor, but the top needs to come away when you open it and go back onto the butter regardless of how much is left, so I'd want it to be flat and on a pivot with some sort of feedback to measure far down the sensor is. But even that pivot needs to be complicated to move up and down without the thing hitting the sides.

pic related