> Can somebody give help with a temperature sensor using fuzzy logic
> in a pic 16c84 or 16f84?
>
> the main problem i have is that i don't use control equations to control
> a device with actuator of temperature
>
>
>  i want to regulate temperature at constants rates
>
>  Has anyone some code or ideas to do it?
>

Microchip make a Fuzzy Logic Development System that has an example
board supplied with it that is a temperature controller. It is called
fuzzy LAB 1, facinating to play with.

But as nice as Fuzzy Logic is at reducing hideous transfer functions
to simple terms ( I may even use Fuzzy Logic one day in a project ...
just waiting for an application ) what you seem to be wanting is nice
smooth temperature control.

I think an ADC could read the temperature, a PIC could apply the
reading to a lookup table and output an appropriate PWM setting to
drive a Power Mosfet (or some such appropriate device depending on
power source) which will vary the power output of a heater.

The lookup table will give the advantage of non linear control of the
heat output... e.g. as the heat gets close to the desired level the
steps on the PWM could be small thus minimizing overshoot.
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

www.psych.auckland.ac.nz

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