I would like to build a circuit to perform a timed shutdown, based on logic inputs from headlamp wires and ignition wires.
I have decided on PIC10F200 (datasheet) to perform the logic.
I also have many spare 7805 linear regulators, so thought I'd use those to perform 12V->5V regulation before connecting directly to PIC pins configured as inputs. Is this a terrible idea? I have added pulldown resistors so that the PIC input pins can read defined values.
Using Fritzing, i've created a circuit:
I'm still tinkering at the moment, and this being my first PIC circuit, I want to make sure I can avoid all the possible traps when working in an environment like this.
So basically, is the circuit okay, or have I overlooked things?
All and any help appreciated, please go easy on me. I'm new!
Following advice from Olin and Wouter, I now have this:
Is this ok?
Olin says making use of the weak pullups on the PIC could save on component count, yhis is how i've interpreted him: This works in the simulator, but I've no idea if my pile of BC547 are suitable!
I also don't know which to choose, or why?
Thanks again guys.