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PID controller to control temperature Answered

I need to control the temp. using PID controller @ an accuracy of the +-0.5 degree Celsius.
What will be the procedure step by step, to do the task.
Please note that Range is 35 to 40 degree Celsius &
ACCURACY is of prime importance.

Please reply fast.
Waiting for your positive & valuable response.
Thanks &Regards-


Check for the controllers used in egg incubators, they are in your temp range and accurate to 0.2°C.
Most go from 35 to 39° only but can be adjusted through the settings.