I read a little bit about JFETs and that seems like it will work but I don't think I can use negative voltage. I'm looking at MOSFETs right now to see if those will work (a JFET is a type of MOSFET?) but my brain is starting to hurt
Sorry if this is all too basic but I haven't done anything like this since I got my mom to buy me a beginner electronics kit in elementary school.
Anyways this is what I have with the relay plus transistor. I still need to limit the current to the temperature diode but that's later.... I can use another LED driver for it as a last resort.