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Originally Posted by TurnNBurn
So I'm looking at the batteries and I have (obviously) the two cables from each pack. These two will go to the analog inputs on the mux shield? And from the mux shield that will be connected to the display?
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Each cell's positive will be hooked up to an input on the mux shield (through a 20:1 voltage divider of course - see 100K/5K resistors in above diagram), withe pack negative hooked up to Arduino GND. The mux shield plugs directly into an Arduino Uno R3 or equivalent.
The mux shield hogs a lot of digital pins on the Arduino for configuration, so I would cut/solder the necessary jumpers on the mux shield to permanently set it up for the desired analog inputs to free up Arduino pins for other things. This procedure is simple and well documented in the mux shield manual.
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What worries me is I look at that wiring diagram for that fuel guage and I know there's going to be more parts to this BMS. Transistors, resistors, transducers, etc...I'd need a diagram to study and a full parts list up front before I feel safe tackling it. Do you have a diagram for the BMS? So I can get a feel for what's required for that?
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This diagram will not be much different that the one I posted above, as far as inputs/outputs go. Just add more inputs. Maybe remove the fuel gauge output and rely on a reading on your LCD for fuel level.