On the PC side of the control would be the smarts to control 
temperatures and have various recipes for different temperature profiles.

These scenarios are common when smoking

Control the cabinet temperature only.
Control the cabinet temperature and when the internal temperature of the 
meat reaches a point change the cabinet temperature to the internal 
temperature just to maintain internal temperature and sound the general 
alarm!
Control the cabinet temperature and ramp from one temp to the next over 
a given time span.
Have recipe controlled time and temperatures.

I do this now with a PLC with a thermocouple card and a touch screen 
interface but it is far from cheap...

I've taken house air conditioner thermostats apart and made fermenter 
controllers with remote direct sensing of the temperature of the wort 
but it is a simple temperature setting for that.

http://suburb.semo.net/jet1024/Controller.htm

So I'm well aware of the $10 temperature controllers.

It doesn't have to be fast, just be able to get the temperature info to 
the PC and be able to switch on and off some SSR's.

John

Jon Elson wrote:
> John Thornton wrote:
>    
>> Kirk,
>>
>> Do you think something like this could be used to control the
>> temperature of a smoker cabinet with 500 watt heater? I've been wanting
>> to build something that is very cost effective that could be plugged
>> into a laptop via usb or something and control the smoker heater...
>> Being electrical engineer challenged any suggestions would be helpful.
>>
>>
>>      
> You can buy various thermostats for about $30 that ought to cover the
> temp range required.
>
> Jon
>
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