Connect a circuit to already existing system

[bright]

How can I connect a circuit to already existing system. Hence adding other features to the system

 

[BobK]

With wires.

Bob

 

[Ian]

Welcome to the forums @bright. I've seen that you have created 3 very vague questions within the space of minutes - all of them sound like you are tying in questions from homework and you just want us to provide "urgent" answers like robots.

This is a discussion forum, where we can help and advise with homework problems you don't understand, but it isn't the place for you to get others to do your homework.You need to put in some effort to get help. If there is something you don't understand about the question, please elaborate and we can help.