How to use Relay RY5W-K for Pic18f4520 microcontroller chip?

[caramelz]

the purpose of having a relay, is to check the voltage of the battery. is ADC needed? please help

 

[wp100]

Hi,

You do not say what programming language you are using, but you can get an idea of how to do that from this link, one of many such projects out there.
http://picprojects.org.uk/projects/vmon/

 

[betwixt]

You give some clues about what you are asking and we will try to help.

What relay?
What does it do?
How is it connected?
What battery?
What voltage?
What voltage limits are you checking?
What response time?

I'm afraid at the moment your question is like "what does a knob do?". Relays have many uses, as do microcontrollers and ADCs, what they do in your application deends upon it's design and you told us nothing at all about that.

Brian.