Tracking down a beacon in a city area can be difficult, but speaking = about GPS... If you wire up a GPS, GSM module, a PIC and some software you will not = have an alarm, but more like a very good tracking system. To locate your = bike just send your secret kode to your bike as a SMS, and it will = return the exact location of the bike within seconds. Of course this would be a dream device, because you will meet a lot of = problems like charging, antennas, fitting it into the frame bla bla = bla... For a car, a device like this would be nice and not to expensive, but = for a bike? Everything needed is available at resonable costs (anyone care to build = one?) I don't know how the cellphone systems work in the US, but you probably = have something like the GSM system with the capability to send short = text messages. Anders ----- Original Message -----=20 From: "Patrik Husfloen" To: Sent: Sunday, June 10, 2001 9:11 PM Subject: Re: [EE]: A fool-proof bicycle alarm Sounds interesting, there's plenty of space in the frame and I suppose = you could create some tough container to put it in to prevent it from = being removed and smashed, perhaps some sort of expander on it and a 20" = (about 50cm) "screwdriver" to lock it in place inside the frame. the antenna is a bit of a problem though, if one could use the actual = frame as an antenna that would be cool, I don't know much about RF or EE = for that matter. I suppose something similar to what you use to track your dog when your = out hunting, the dog wears a beacon and you have a directional receiver you turn 360 = degrees and see from what direction the signal is the strongest. Sure GPS etc is valid but also expensive and very complicated. It would be fun to see if this could put into real use. Any ideas/suggestions? ----- Original Message -----=20 From: "Craig Lee" To: Sent: Saturday, June 09, 2001 3:03 PM Subject: Re: [EE]: A fool-proof bicycle alarm > I still think the best way is to have a hidden telemetry transmitter. > That way you can catch the sob and inflict a different kind of pain. >=20 > -----Original Message----- > From: pic microcontroller discussion list > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of D Lloyd > Sent: Thursday, June 07, 2001 2:49 AM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [EE]: A fool-proof bicycle alarm >=20 >=20 >=20 > Hi, >=20 > Not much is going to be effective......If someone is determined enough = to > steal something, they will......take a wheel off and they will throw = it > into the back of a van. Lock it down and they will turn up with a = large set > of bolt croppers. You cannot win, unfortunately, except to keep it in = a > place where is raises the stakes for someone to steal it - like in = your > house. >=20 > Dan >=20 >=20 >=20 >=20 > (Embedded Patrik Husfloen @MITVMA.MIT.EDU> > image moved 30/05/2001 02:29 > to file: > pic05436.pcx) >=20 >=20 >=20 >=20 >=20 > Please respond to pic microcontroller discussion list > > Sent by: pic microcontroller discussion list >=20 >=20 > To: PICLIST@MITVMA.MIT.EDU > cc: > Subject: Re: [EE]: A fool-proof bicycle alarm >=20 > Security Level:? Internal >=20 >=20 > Yeah I know hurting people would most likely get me in trouble and it = was > ment as a joke, if it was unclear I applogize (I blame it on the fact = that > that it's 3:30 am :) > I guess Mr VanHorn is correct in his statement. >=20 > /Patrik > ----- Original Message ----- > From: "Nick Veys" > To: > Sent: Wednesday, May 30, 2001 2:52 AM > Subject: Re: [EE]: A fool-proof bicycle alarm >=20 >=20 > > Considering theft deterrant devices that cause damage/harm to the = thief > are > > illegalish, odds are if someone got hurt by your system YOU would be = the > one > > in trouble also, so I'd shy away from that (of course I'm assuming = you're > in > > america, if not, laws may be different). Maybe try not leaving it > outside > > your house for hours? Your only real option would be an extremely = loud > and > > obnoxious alarm in an extremely strong casing, perhaps even inside = the > frame > > of the bike if you can dissassemble it to such an extent to get at = the > > tubing to install it. Triggering it with 100% validity and no > "accidental" > > triggers is the problem alarm makers have been dealing with forever, = it's > > tough to tackle. > > > > nick@veys.com | www.veys.com/nick > > > > > -----Original Message----- > > > From: pic microcontroller discussion list > > > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Patrik Husfloen > > > Sent: Tuesday, May 29, 2001 7:46 PM > > > To: PICLIST@MITVMA.MIT.EDU > > > Subject: [EE]: A fool-proof bicycle alarm > > > > > > > > > Hi, > > > I've spent some long hours trying to figure out a way to > > > construct a bicycle alarm that isn't subject to kids poking at it > > > and having it go off for fun, or just because someone bumped the > > > bike by accident. > > > I also want the alarm to either 1) hurt like hell, 2) hurt like > > > hell, 3) make a lot of noise that hurts like hell. > > > I've had my bike stolen about 7 times already and I'm starting to > > > get sick of it, only once did the theives get caught, turned out > > > they were drugged out losers, at least they got sent to jail. > > > > > > My bike isn't exactly cheap, about $1100 (USD), so spending up to > > > $60-70 wouldn't be too unreasonable. > > > The last time it got stolen I got really pissed off. > > > I left it outside the house for about 2-3 h before I noticed it > > > was gone, so I called the police etc. > > > Later that night I was walking my dog and I found the bike (or > > > what was left of it) behind a building, maybe 50m from the house > > > I live in, completely slaughtered, not a _single_ screw was left > > > in the bike. > > > And they even cut(!) the frame (the only part left) in two just > > > so they could get the read wheel with them, it had one of those > > > big U shaped locks on it. > > > > > > My dad suggested strapping explosives to it, which isn't a bad > > > idea if it could be made 100% sure no inncent people got hurt or > > > that it wouldn't destroy the bike. > > > > > > Any ideas are greatly appriciated, > > > > > > Patrik > > > > > > -- > > > http://www.piclist.com hint: The PICList is archived three = different > > > ways. 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