Hi Andy, Subject: [EE]: Help water level How about a gas tank level Indicator. you could use a magnet and a hall efect amplifier into analogue port. We used 32 hall effect switches to indicate the position of a piece of test kit while under development. The final kit was a bit steal from a Mouse one of the wheels was used as a up/down pulse counter, so position of tool was known. Sorry if not too much of details are here as I don't know if I could release details as I do contract work in the Electronic Industry, and don't know who listens to the list. I met a list listener in York last month he worked for a competing company I was working for. He knew all the names of Contributors like Tony Nixon and Olin. Regards Art -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.