With the following circuit, would the R2 resistor not change or affect the polarity in some negative way (no pun intended)?
In the image below I added the red box as well as the red text in an effort to try and understand what is happening when the R2 resistor attaches to the +4V lead.
Can someone please explain what it is doing assuming that everything on the circuit is correct? Note: The positive lead is switched power, so it might be on or off at any given time.
Reference webpage:Power Control System for RPi Car PC