> There are more sophisticated control loop designs that can handle this > better, eg by using two temperature sensors, one at the crystal and > one at the heater. But designing them correctly is more difficult > than the normal PID loop. >
Keeping with the thread topic, I think this is the key. For the cost of only one more cheap sensor you gain a lot. Harder design as you say but getting help on-line seems to be free. I have gotten PID to work myself with linear systems (motor speed) and I reading up on Kalman Filters as I need them for navigation using multiple sensors. I guess one could use the crystal frequency as a measure of its temperature to tune the system. Is there a name to Google to read up on using two sensors and a pid-like algorithm? -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
