First post here. I've only just started with Arduino but already I am hooked. I've searched the forums and google and I cannot seem to find anything that would help me with this particular project.
I live on a boat on the internal waterways of the UK and as such live "off-grid". My power comes from a leisure battery bank which is kept charged either from my engine's alternator or from 350w of solar panels on my roof.
To heat water (shower's etc) and to cook I rely on two 19kg propane cylinders which are stored in a separate gas locker at the front of my boat.
I am looking for a way to measure the amount of gas left in these bottles - they last for a few months each but if they run out it's cold showers and cold food all round...
My first thought was to weigh the bottles to determine the amount of propane left in there; the issue is that my gas locker is known as a "wet locker" and therefore has about 6" of water in the bottom of it. This and the fact that the gas bottles can move around inside the locker at times when the boat is on the move put me off this idea - I think it would be too inaccurate and tricky to install.
I also thought about measuring the temperature of the bottle to determine the level at pre-determined points along it's length, but due to the fact that the bottom of the bottle is submersed that is also not an easy option. In addition to this, the bottles are exchanged rather than refilled, they are not a permanent install; making alterations to the tank, or attaching something that is not easily removed is not really an option either.
I do not need anything particularly accurate, a simple "Full, 3/4, 1/2..." type gauge would do.
All the Best,