I have a (for you probably very easy to answer question). It was a while since I did electronics and I am still reading up on it again.
Here is my project. I have an old car and it shall look as it was old as well (also after I am finished with all the work).
I want to add a little fun extra, like a bond gadget. I have currently an unused (don't know why) switch on the dashboard.
This is what I want to do: When I use the switch I want a new radio to appear from a hatch in the middle. The mechanics I can do. I have a question to the electronics.
The car is an old car (with plus on the chassis which I will rewire) and 12 V. How does it now work with the arduino uno. Do I need to power it separately and then use a relay to work the engines or can I use the 12V from the car battery to power it and so to speak integrating it to the cars electronics (its from the 60s so the electronics of the car is not as sensitive as modern cars)? I want the cars 12V to power the little motors that operate the hatch and mechanical parts. How does it work with the switch, it is currently connected to the cars 12v electronical system obviously, can I use the same switch for the arduino or will the resistance be too high. Did I miss a major thing?
Any tips or ideas are greatly welcome.