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  1. #101
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    Dr_Mohammad's Avatar
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    Re: how to design a thermostat without Microcontroller?

    Quote Originally Posted by c_mitra View Post
    You still need to work on the span control (the hysteresis range) and the temp setting.

    In the present case, they are strongly interacting. You should be able to set the actual temp and the hysteresis control independently.

    That will involve only a couple of resistors and one more potentiometer.

    You are using film capacitors but for this application, ceramic capacitors will be somewhat better.

    See the application note for LM35 for more ideas.
    How to do span control?
    Hope is a good thing, maybe the best of things and no good thing ever dies (The Shawshank Redemption).



  2. #102
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    kripacharya's Avatar
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    Re: how to design a thermostat without Microcontroller?

    Quote Originally Posted by Dr_Mohammad View Post
    How to do span control?
    Great to know it's working! I'm sure all contributers will be happy to read this.

    My advice - check the operations / play with this circuit until you know exactly how it operates / behaves for some days now.

    Only AFTER that let's talk about supposed enhancements to the functionality.



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