Reverse Polarity Protection

That works well ....

Thanks!

Should I use a MOSFET?

why not use only a diode (like 1n400x) in series to the led? Yes, some voltage drop.

When you flip the switches, the LED is still polarized in reverse.

Maybe not the best example to use a diode as a load to prove reverse current protection...When you put in a resistor it will draw the same current both ways.

@sshsslfun, I just read your profile. It looks like your into programming and know some lua. I know a little lua too, but I don’t know what to program. Once I made a prime series generator, and I’ve made a few quines (programs that take no input and output themselves) and even expanded one of the quines into a program that just keeps making copies of itself, but I never ran it in fear of what would happen and how long it would take for me to delete all the copies. I also made a password security system, and a program that asks for a name of a program and then runs that program. Probably none of these programs are more than 20 or 30 lines long though.

@jason9 Nice, I've made similar things like file finders in bash. Right now Im working on a network security project just based around too much encryption for a text file saying "KKACHOW". Right now its several scripts, in total around 400 lines of code. All in Python. I'm later writing it again in C++ and maybe Golang.

Theres a small bit of a problem, more current is going in due to the relationship between current and resistance. I can try to solve this with a overcurrent/overvoltage/undercurrent/undervoltage circuit by having a VRef aswell as a Resistance Reference circuit.

Im publishing a full protection circuit this week including overvoltage, undervoltage, over current, under current, reverse polarity, and short circuit potential