Gday Fahim
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Andrew It would be nice to get some schematics of a PICAXE System to with multiple heater control. I imagine all could share a single Ambient sensor.
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Have attached a copy of the schematic for the box i referred to above.
However, i did note the PICAXE runs slower than a normal PIC and has other limited functions. One of these limitations is it only runs one hardware PWM channel. This is not a showstopper, but i havent tried to see what the timings would be like to run a bitbanged PWM, esp 4 channels.
Just one thing. I mentioned in an earlier post re trying to get a surface mount unit going. I never got back to that, but the idea of putting the heater right on/near the strap was to try and reduce RFI from the cables.
Rather than have 4 units in one box, another option may be to use distributed processing. ( Sounds techo but is simple really )
The PICAXES have inbuilt serial comms. If one main unit were placed somewhere, with the ambient sensor in it, as well as the fusing and 5V supply, then individual ( much smaller ) units could be made up for each heater. These would only have a small PICAXE, a pot, a local temp sensor and a MOSFET.
The master PIC would just send out the air temp when reqd
, and the local units would carry out instructions. This would make a very flexible system, and much cheaper for larger nos of heaters.
Now that i just thought of that, i'll have to think about it some more.
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If you can provide a parts list perhaps a mob like jaycar or Microzed could be convinced to carry a kit.
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Not sure there would be a large enough market for them to consider it.
Andrew