Newbie: Dunno How to get started

[Dave]

ckyz, Another cheep solution is to use a dip tube or bubbler and a pressure gage to measure the pressure it takes to full the tube before air comes out. This method is used for many types of level controls in liquid type media. The pressure is proportional to the level of the liquid so it can be calibrated to the amount in liters or gallons. Water is 1 psi per 2.307 feet of depth.

Dave Purola,
N8NTA

[blainecf]

Inside your gas tank, there's a continuously variable float sensor. New they're spendy, but from a junk yard - cheap!

They should read very easily using A/D, since they're nothing more than a volume control (potentiometer) with an arm on it. Speaking of that, you could make your own using a volume control, a piece of stiff wire, and something that floats.

regards,