@CoyoteOldMan and @Eiffel
Temperature Charting. Cuprajake PID vs. Default PID.
* None of this probably matters from a, “is the coffee better” perspective, but it is fun to look at.
* X axis range is different across the 3 panels. I wanted to zoom in on specific times of interest.
Coyote, you are correct I am in the US and have a 110/120V 15A machine.
I used Cuprajake’s PID values from the YouTube video a few post above. Here are the things I noticed:
- The brew boiler did not heat up as fast with the new PID values. I think that makes sense because Kp was reduced (a lower Kp should overshoot less). What would be the advantage of a lower Kp (1) if the default value (2) was not overshooting? I think I am going to change Kp back to 2.
- New steam boiler PID changes were slightly better (few second faster heat up time). Too small to actually matter in practice.
- Eiffel suspected that increasing the group heater B value would decrease the oscillation; I think you are correct. The oscillation is gone and the temperature comes to a steady state faster. Interestingly, the steady state doesn’t get to 94.5C; it only gets to 93.7C. I need to do some experimenting after I get a better grasp on what each value changes. I think if I increase the Kp value to 3 it might help get it up to 94.5C.
