ha , ha , ha,
No kidding ? That's why it's called an Analog to Digital Converter. What you are talking about might require a different approach. Your objective does not appear to be a digital count value in the range 0-1023. If it were , you wouldn't be posting for this question.
I can't tell if you're trying to come off rude or not, but keep in mind that I'm at your mercy and coming here for help, not to be belittled. And yes, I believe I am looking to assign a digital count value in the range 0-1023, but applied to 12V instead of 5V levels.
Is it possible to or is there a device that can convert a 0-12V input to 0-5V input so that it's usable to the arduino? There is something I would like the Arduino to measure but it varies between 0V and 12V.
Asking a question about a specific solution using "vague" or cryptic wording like :
There is something I would like the Arduino to measure but it varies between 0V and 12V.
is not going to help much. Is there some reason why you can't tell us what it is you want to measure ? You want us to help you but you are omitting something we need to know. Is that intentional or unintentional ?
I'm sorry, I was just trying to keep it simple.
Automotive stereos with Steering Wheel Control (SWC) capability typically operate in one of two major "styles" or "methods". There is the older style typically referred to as "Analog" in which a resistor network or voltage divider is created between the steering wheel's buttons and slip ring. This different voltage or resistance value is passed on to the radio via a wired connection. The radio then "interprets" the different voltage/resistance values as commands. The "Digital" style typically uses CAN-BUS communication which is typically serial data communication using +/-5V or +/-12V pulses.
I did a little research and found out that my car uses "analog" SWC. I'm not sure yet whether it rests at 5V (preferable) or 12V. If it rests at 12V I would like to be able to read the voltage it's pulled down to and store it to memory so that I can then use these voltage levels as triggers for independent outputs.
I can get into more detail about the outputs if you'd like, but I think it's irrelevant to the first portion of my task at hand.