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Old 06-12-2012, 07:21 PM   #21
berndtr
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Quote:
Originally Posted by GriFF3n View Post
The arduino will be connected to a temperature probe. The program will monitor the probe and send a control to turn off the elements once the desired temperature is reached. Thats the function of this project. Adding a PID controller is a great idea, I just don't know how to do it.
I think I get it, however your using sledge hammer to nail in decking, while it'll get the job done, its the expensive and under-utilized way of doing things.

Just so I have it clear, your using the ardino to set a temperature at which to turn a single relay off while keeping the second heating element on? I believe you'd be much more satisfied with using a PID control set up.

Pulse Width Modulation is a technique where by varying the % you have the heating element on you can control how much heat actually goes into the kettle. PID is a control algorithm used to adjust how much heat to put in based on the Temperature probe.

While you can go out and buy a dedicated PID controller and it may be the easier option in this case, you can program the arduino to act just like that PID controller.
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Old 06-12-2012, 07:36 PM   #22
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There's actually an Arduino library for floating-point PID control. I don't like it and I think it's slow and overkill, but you don't have to write your own PID algorithm, even with the Arduino.

http://arduino.cc/playground/Code/PIDLibrary

Because of the system response times involved, I think that simple thermostat control (like my pseudo-code-example) is sufficient for all brewing purposes.

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Old 06-18-2012, 11:41 PM   #23
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What' the PWM frequency for driving one of the 220v/5000w heater elements?

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