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You should use anolog pins of the microcontroller, by using a high- valued resistor- voltage divider you can decrease the voltage range to the 0v - 5v. By using that signal you can measure the voltage, but you must translate the data you get for ac (sinusoidal) form.
You need to rectify the AC input to get a DC value that is going to be approx. the peak value of the AC input. As this value is very high, place a voltage divider to suit the range of the ADC inputs of the micro controller.
Take care with the voltages that you are handling. The peak voltage will be more than 560v. Standard resistors do not withstand high voltages. So the voltage divider should be designed carefully. Using suitable resistors and connecting several in series to use them in high voltage.
I'm looking for the same thing Sirs . Could you please help me to design a circuit for this ? I want to use a microcontroller and a small LCD display to show the voltage of some particular source . Another improvement, I want to improve the circuit to be connected to a high voltage/high current socket then when the socket is connected to a source and a load, then the lcd display shows the voltage and the current flowing through the socket that instance of time .
But for the microcontroller based circuit, i cant use another dc 5v supply as its not practical, I want to make a modification to let the circuit gets 5v from the power flowing through the socket that time . There should be a rectifying process to make the circuit run i think .
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