i need help

Unless there is a source of heating/cooling within the room, then such an arrangement is unneccessary, and a manual speed control is all that may be needed instead. Such control could be provided by the user operating an on/off switch when required.

you need temp senser with control circuit to be connected to ceiling fan regulator.also control circuit to set the seeting & control speed of fan then only it is possible

If the heating/cooling source is not present in the original poster's room, then such a system will ramp up to maximum fan speed and stay there. A simple on/off switch makes an easy substitute.

PWSlack,

Your first comment is easily seen. It is a little over the top to repeat what you have said after any additional comments that also speak to the poster's question.

It is almost as if you are saying, 'I am a guru, I have commented, no further comments are necessary'.

It is almost as if you want someone to challenge your logic by responding with something like the following:

PWSlack:

Although your logic may work in an academic and purely theoretical world, few of us live there with you. Here in the real world nearly every room has what can be described as heat sources and what can be described as heat sinks.

People and machinery are often sources of heat. Perspiration from those same people may become a heat sink with sufficient circulation.

Concrete floors and windows (open or shut) might be additional places where heat is lost or gained. The rate of loss or gained could be altered with a ceiling fan.

Additionally, temperature gradients can be found vertically in most rooms. A ceiling fan probably could have an effect on this as well.

I don't intend any offense to your guru-ness, just hoping you will make allowances for those of us who reside in the imperfect real world.

Benbenben

Then describe an alternative solution.

it is not really an alternative solution, but rather, it was said that:

"i need the control circuit of automatic speed control of ceiling fan based in temperature for 230v ac supply.."

so it would mean, based on our logic, he should place a temperature sensing device to make "temperature based"..

Heat flows from a hot place to a cold place via a temperature gradient. If a temperature gradient does not exist, then the presence, and speed, of a fan will have no effect. Adding a control system in such circumstances would achieve nothing. So, what is the nature of the temperature difference that the fan speed control system is being added to?

What is providing the temperature difference (the question is unavoidable!)?

Is this a heating requirement or a cooling requirement?

thx for you help. tell me more how can get review about that