I want to control 230V AC and regulate using arduinos 0-5V variable DC output.
Which AC regulator I can use that take vraible 0-5V DC as a input from arduino and regulate the 230V AC according to 0-5 V DC from arduino.
Same like using controller with AC motor ,but there we have potentio meter where we can adjust the 230V AC supply to motor.But I dont want to use this and give direct varaible 0-5 V DC from arduinos analog output to 230V AC regulator.
Does anyone have idea or suggestion please.
What part of 230 VAC do you want to control? The RMS voltage, which is the 230 part? The peak to peak part? Do you want to control the frequency? Do you want to control the current being used by the 230 VAC circuit? do you want to modify the sine wave of the AC?
Or do you just want to turn it on and off?
230 part is like 230V Ac coming from our energy meters output to our home.Using arduino I genrate variable DC from 0-5 V in analog pin and by using this 0-5V DC .I want to vary 230V AC Bulb.Like If controller get 0V from Arduinos analog output then bulb will be full bright and when it gets 2.5V DC from arduino then it willbe half dimm and when it will get 5V DC from arduinos analog input then bulb will be off.
Then search for a motor controlled variac, which is a variable transformer that varies the output based on the position of a rotating tap on the transformer.
If you DO NOT care about maintaining the sinewave of the 230 VAC, you may get by with a lamp dimmer controlled by an arduino.
Adjusting or regulating AC voltage (while maintaining the sine wave) is not trivial unless you use a transformer or a variac, which is a variable auto-transformer.
I don't know much about AC motor-speed control but I remember that different types of AC motors need different kinds of speed control.
With some motors something similar to a light dimmer will work. A regular dimmer "chops" the AC waveform so it's only on for part of the AC cycle. (How dimmers work)
With a microcontroller based dimmer, you need to electrically isolate the TRIAC (the component that switches on & off) from the low-voltage microcontroller. You also need to detect the AC zero-crossing to synchronize with the AC frequency. The zero-crossing detector must also be electrically isolated. Normally, optical isolation is used and there are special-purpose optical isolators made for TRIACs,
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on the) your project.
Yep.
Explain what you actually want to do.
Do you want to dim a lamp? What sort of lamp - incandescent, fluorescent, LED? Give exact specifications (Web link) of the lamp.
What is the purpose of dimming the lamp?
@ Paul_B
Actually As you see on diagram.Main purpose is to regulated the 230V AC comming from energy meter to household using analog variable 0-5V DC from arduino.
Same like regulating 230V AC.I want to check just behaviour,how it will regulate the 230V AC coming from grid with 0-5V variable DC from arduino.
But you have not told what you mean by "regulate".
Or in any regard, why? 
Hi,
How do you want the 230Vac to be controlled?
Phase Method, ie, Using a Triac to cut the AC waveform and produce an adjustable RMS voltage made up of segments of the AC sinewave?
OR
Transformer/linear method ie, Keeping the sinusoid waveform and adjusting its peak value, so you still have a complete sinewave but of adjustable amplitude?
There is a big difference between the outputs, it depends on your load.
Tom.... 
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