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Ultrasonic fuel level

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  • Ultrasonic fuel level

    I thought that I would try and install a fuel gauge so that the fuel level could be monitored while flying (as apposed to try and look at the sight glass along the side of the seat tank while flying).
    I do use a timer, check fuel level before flying, and allow for 1/2 hour reserve fuel by the time I return.
    I purchased an ultrasonic transducer for less than $30, and an Arduino (from China) controller.

    When testing using a couple different plastic jugs, this worked.
    When I connected to the fuel tank on my gyro, I am not getting a reading. As the base of the seat tank is not horizontal, I thought that maybe as the signal is going through the tank and bouncing off the fuel level, the signal will not be redirected back to the transducer. So I cut a bit of aluminium bar at an angle to make a wedge so that when I stuck the transducer to it, it would be perpendicular to the fuel level.
    Still no luck.
    I thought maybe rotational moulded tanks may not work, so I attached to another seat tank stored in my shed. This worked.

    Not sure why not working on the tank on my gyro.
    Attached Files
    Remember: no matter where you go, there you are

  • #2
    the other photos
    Attached Files
    Remember: no matter where you go, there you are

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    • #3
      If I go ahead with installing a (accurate) fuel gauge, may have to go with a capacitive fuel sender.
      With a capacitive (rather than a sender with reed switches that will make changes in step on the gauge every time the float passes a switch) you can code the microcontroller for non-linear tanks, and has a resolution of (less than) 1 mm.
      The cheapest sender I can source is AU $ 250.
      Unless I want to buy at least 20 of.
      Would also be cheaper if of a size less than 600 mm long, but need about 850 mm for the seat tanks.

      Rossco
      Remember: no matter where you go, there you are

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