I'm new here and wonder if you could help me out.
I'm trying to build a Lipo warning/cutout circuit for four lipocells.
The idea is to have a bicolor led showing green above 14V, orange between 14-13.5V, flashing red belov 13.5V and red below 12.5V also switching off the load.
I built and programmed the circuit and it works fine using no load, but with a load drawing about 5A the output from the 7805 rises to about 5.5V offsetting the programmed levels (although in the right direction) but perhaps destroying the cpu.
My question is what did I do wrong when designing this circuit? Why is the output from the 7805 changing when applying a load?