Hi Well I've tried to build one of these things and... a) What you fill it with depends on how you expect it to work. From what I've seen you basically have two choices. One is to use some kind of substance that does allow a current to flow through it and then make sure you use an equal AC current to ensure that you don't get all sorts of odd things happen to the stuff! Second is to use some sort of liquid that does not conduct and use a purely capacitive effect. My understanding is that most of the commercial sensors use the first of these options (this is the way I've tried doing things). b) I've seen articles that use water (possibly de-ionised not really sure), with a small amount of alcohol added to help prevent the surface tension problems. c) The big problems I had was getting the damn thing sealed up (you have to have a really, really good seal otherwise they eventually dry out. Most of the things you would like to use as the liquid have a nasty habit of screwing up most of the things you would like to use to seal them! e) Sounds like you are going to have a very small space. I would take great care with checking that the surface tension/capillary action problems do not screw you up. f) Check the resolution you need most of the commercial units I've seen get better resolution by going from a wider gap between the electrodes. Sounds like you won't have that option! Good Luck I spent ages trying to do this and then gave up and got a commercial part (but then the facilities (and skill) I had available may not be anything like yours!). Let us know how you get on. Andy ----- Original Message ----- From: "Peter L. Peres" To: Sent: Tuesday, October 24, 2000 9:41 PM Subject: [PIC]: Electrolytic tilt sensor: build ? > Hi, > > I am interested in integrating a $SUBJ very tightly with a very small > board. That means build it, as all parts are too big for this. > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:","[SX]:","[AVR]:" =uP ONLY! "[EE]:","[OT]:" =Other "[BUY]:","[AD]:" =Ads