Wagner, Air logic is often still used in many machine shops. They have 90 pounds available, and it doesn't short circuit with all the metal chips around. Clippard was the big name, as I recall, and they're still in business. Andy Wagner Lipnharski on 04/18/2000 10:22:05 AM Please respond to pic microcontroller discussion list To: PICLIST@MITVMA.MIT.EDU cc: (bcc: Andrew Kunz/TDI_NOTES) Subject: Re: Air powered electronics You will be surprised about the "pressure computers", some tinny little pressure components, gates, switches, that together can do complex calculations and so on. I don't know if they still in use, but I saw some marvelous like that 15 years ago operating in highly explosive ambient. IBM was researching "light computers", an array of micro-optical devices that used only a laser as its main power source. Gates and switches change state when hit by a photons, and of course they allow or not photons to go ahead... another science fiction turning to reality. Not a single microampere of current in such high speed computer. Spehro Pefhany wrote: > > At 11:50 PM 4/13/00 +0200, you wrote: > >I4m working on a project where the customer don4t want electric connection. > >And no batteries needing to charge, switch or anything like that either. > >Too dark/small/dusty to use solar power. > > There are such things as air motors, used in process control equipment > where electricity is too dangerous. I think the price may be too high > for your application, though, and you'd need a generator too. > > An air-powered die grinder sells for about US$10 retail, Asian made, > with the following specs: > > Operating pressure: 90 PSI > No-load speed: 25,000 RPM > Air consumption: 3 CFM > Air inlet: 1/4'' NPT > Collet size: 1/4'' > > Maybe you could couple that to a generator to get the power you need. > > Best regards, > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > Spehro Pefhany --"it's the network..." "The Journey is the reward" > speff@interlog.com Info for manufacturers: http://www.trexon.com > Embedded software/hardware/analog Info for designers: http://www.speff.com > Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=