I'm fairly certain it is much more simple than that. There is probably just a float switch down low in the tank. When the level gets down low, it flips the switch.

 

Very simple, the light comes on and you coast to a stop. :grin2:

 

The sensor measures about 3000 ohms when the tank is full, and about 300 ohms when empty.

Hope this helps.

 

Hi Rob,

yes that helps. The background for my question is that i am in the process of fitting the AIM MXL Dash to my Paul Smart.

The AIM Dashboard works differently than the Motogagdet for example. It has warning lights for fuel, indicators and high beam, but the firing up of the LEDs has to be configured. It is not that they are lightened by the voltage coming from the vehicle.

In other words: all analog inputs (fuel, high beam etc.) are voltmeters measuring from 0 - 5V. In the MXL configuration software you are than able to tell the Dash to light the LED at e.g. >3V.

Same with other sensors e.g. oil temperature and oil pressure, those values are coming through the CAN Bus directly, so you don't need the wire from the dash. Just tell the LED to fire up at temperatures > 170 celsius, or at oil pressure <900 mbar for example.

So its a complete different approach to the motogadget

Andreas

PS: With a more accurate table 100% -0% Fuel/ Ohm/ Volt you could configure a software only "custom sensor" by the configuration software. The Dash would show the level of fuel in % and the low fuel light would switch on on any defined value.

Like this:

 

Hi Andreas,

Cool project !!!

Unfortunately you won't be able to use the low fuel sensor as a level gauge.

When the sensor is surrounded by fuel it is kept cold. It doesn't matter if the tank is full or at half level or quarter level, the resistance measures the same, about 3000 ohms

Once the fuel level drops low enough that the sensor is no longer surrounded by fuel, it warms up and changes resistance, to about 300 ohms.

Cheers

Rob

 

... oh too bad. Could have been a real cool solution...
Andreas