Gday Fahim
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Can the PIXAXE handle two or three heaters automatically, what are the input output limitations?
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Yes and No, ( and all variations inbetween )
The PICAXE is only the brains, not the brawn here.
All the power is handled by the selected Mosfets, the PICAXE just has to drive these ( via a buffer opamp/comparator )
Ie the PICAXE chip could control as many devices as it has inputs and outputs. But is limited from doing this directly by its hardware PWM
I havent looked recently, but one other idea i had a long while ago was to get some of the new digitally settable onewire potentiometers.
Thus, you would build a std sawtooth oscillator ( like i use in my no 1 and no 2 designs ).
The output from this would be fed into a series of comparators/opamps
Each opamp would also be fed by a dedicated digital pot
The output of the opamp would then drive the mosfet
This would give full control of all channels, with limited load on the controlling PICAXE.
Another thing to investigate.
Andrew