I would suggest that if you are looking at taking temperature sensor data and attempting to control some type of heating/cooling device that you implement a PID loop for stability.
https://www.crossco.com/blog/basics-tuning-pid-loops Many simplistic approaches use an ON-OFF controller to turn on cooling or heaters. These can make your stability problems worse than if you just wrapped things up in an insulating blanket. You end up cycling from one extreme to the next. PID loops when properly tuned will vary the speed, current or duty cycle as the temperature approaches a set-point. This avoids overshoot and gives much finer control over the temperature. We used to use 4 wire platinum probes to measure temperature down to the hundredth of a degree. Then for control of the heater element we had a PWM (pulse width modulated) supply. Once the loop was tuned (to minimize positive feedback that causes increasingly crazy oscillations in temperature while at the same time settling in once the temperature soaked through the mass) we could hold a set-point through some wild external temperature extremes. There are software implementations of PID (Proportional, Integral, Derivative) that are pretty easy to understand. There are also surplus temperature controllers on eBay that can accomplish the same thing. *Ms. Tisha Hayes, AA4HA* _______________________________________________ time-nuts mailing list -- email@example.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.