Well PID would be easier for sure. the arduino approach has coursed me some head aches! The code for the HLT is as follows. I can give you the schematic right now as I don't have one but watch this space
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int floatswitch=10...