main supply voltage display using atmega

[gavi prakash]

HI

 In my project i have to display how much voltage is comming from main supply (i.e., 230v r 220) whatever it may be…can you please suggest me how can i read main supply.please give me some idea??

 

thanks in advance

[AJISH ALFRED]

One method is to step down and rectify the ac mains to around 5V  dc and read it using the adc of the microcontroller.

[Ashutosh Bhatt]

use voltage divider resistor network. use resistors with 2W ratings.

calculate resistance values as to get the range of 0 – 230 into 0-5 V.

sense the voltage using internal or external ADC. multiply it with reverse of voltage divider ratio and thats it 

[AJISH ALFRED]

A.M Bhatt’s reply sounds good and easy to make, but I would suggest not to try it that way because of the huge amount of safety risks involved!! 

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