Will this schematic work?


image developed using fritzing.

Will this work, I know the 2 AA batteries wont provide enough power,
just assume its a collection of 6 or 8 AA batteries.Basically only the signal lines go to the arduino and the power is provided from a separate regulated 5v source,also assume the arduino is powered separately.

So will this work?

if there are any mistakes, please tell me how to correct them.


common ground ?

Why do i need a common ground when i am powering the board and other stuff separately.
Please explain (I'm a beginner)

Ah thanks for explaining it richard,
that thing in the middle is a 5v regulator, can be anything,
but i will be using a 7805 and i know that the batteries provide 3v
i said assume it contains 6 or 8 AA batteries :D,
and that thing on the left is a sharp IR rangefinder which gives an analog output proportional to the distance of the object its seeing ,

so it should be something like this?

so it should be something like this?

YES :slight_smile:

Your second drawing ( I really don't like fitz 'drawings' compaired to real schematics, even hand drawn ) is pretty close. You should look up 7805 regulator circuits and see the input and output capacitiors they require/recommend. Also while your IR sensor will work as drawn, you can optionally also wire just the sensor's red wire (+5vdc power) to the Arduino +5vdc pin as that sensor only requires about 33ma or so. It's the servo that can require high current and thus requires an external voltage source like your battery pack.