At 05:46 AM 5/27/2005, Jinx wrote: > > Have a look at the vibration sensors from Signal Quest ( P/N SQ-SEN- > > 003P / 3PS / 3PS-XL) http://www.signalquest.com/ > > > > They're basicaly a ball in cage design, but all the parts are gold plated > > and sealed. I used some in another project - my only complaint would > > have to be price, about $5 US ea in low quantities. But I'm sure they'd > > send a few samples if you told them what you're doing > >Forgive me if I've mis-read the pdf, >but don't these suffer from the same problem as a mercury switch ? Say >the cylinder is mounted horizontally in the veehickle. If it's then parked >on an angle (hill, verge etc) the angle could be great enough for the weight >of the ball to hold it steady and not respond to small tampering vibrations? We've got similar sensors from the same company and they seem reliable and sensitive over a very large range of angles. I'm assuming that there will be at least one orientation where they do not work but I did not find it while I was playing with them. They make a nice product but I have no idea of pricing. The data sheet does specify "Lowest cost sensor of its kind", though. Also mentioned in the data sheet: "No signal conditioning required to interface to a microcontroller". dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 21 years of Engineering Innovation (1984 - 2005) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist