i am stuck up in my project....can somebody help me plzzz...

i am making a hot bag.i need a circuit that will help me maintain the temperature of this hot bag at a particular value set by the user.it can have a window like an upper value and a lower value...

plzzz reply asap...

 

Hello,

What powers the bag?
How do you want to measure the temperature?

Here is a page with links on temperature measurement and regulation:
http://www.educypedia.be/electronics/circuitssensortemp.htm

Greetings,
Bertus