how to measure ac 230v volt in microcontroller

[raman00084]

i want to measure ac line voltage through pic micro controller adc pin, what circuit can i use to measure ac in micro controllers is there any ic available. if i convert to dc it is not leaner
kindly help thank you

 

[paulfjujo]

hello,

you can use a transfo 230V/9V or 6V to have galvanique insulation.. more safe !
i did some test for direct sinusoidal measurement, without rectifier
and measure peak to peak value..
you can see the results **broken link removed**

 

[embpic]

it could be done with using voltage divider which is not that much safe

 

[eriksen]

As stated by paulfjujo you should use a transformer.
You can then use a simple bridge rectifier and then a voltage divider.
This will provide you with a safe voltage source to measure on.

See the post by P_Wood on the arduino forum for reference:


-Fredrik