How can I interface a pic micro to 230 volts ?

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rizzy_dascal

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Could somebody help me do this please,

Basically I want to be able to tell when a wire is live with 230 volts and print on an LCD "ON",

I can program this when a port on the microcontroller goes high, but I need an interface between the port and 230 volts.

Hope this makes sense

Thanks In Advance
Rizzy
 

You can use an optocoupler that gives low pulses in the output and read them from the mcu.
If you want to get pulses only when the voltage is high enough (for example not with 100v AC) then you can use a zener (I have used 200v zener)



D2 protects the optocoupler from reverse voltage
 
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