I'm working on a project of an older car where the water temperature, oil pressure and fuel level are measured by a one-wire sensor, it means the sensor is connected to the vehicle GND (0v) and the gauge shows the resistance of the sensor.
Now, I would like to have alarms on a LCD Screen connected to an arduino mega if temperature hot, pressure low and level low.
My question is the schematic to do this. I found some guys they did it, or at least tried it.
The first sounds good, but i did not understand how the schematic was finally done? Can anyone help me with the correct schematic?
The Resistances to be measured are: Water 100-400 ohm, Oil 100-250 ohm, Fuel 10-70 ohm