Re: gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)
On Thu, 2010-05-13 at 11:19 -0700, Jared Casper wrote: > How cheap a service contract can you get for the sim card? Unless you > can get a per-SMS plan or something, after a year or two you may be > approaching a non-trivial percentage of the cost of replacement. > While the tech solution is definitely cooler, covering the bike under > a renter's or home owner's insurance policy may be cheaper and easier. I don't know your location, but in the UK you can get a PAYG SIM where you only pay per SMS (about 10p each), and as long as you send a message once every few months or so, your credit doesn't run out. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)
On Thu, May 13, 2010 at 8:25 AM, kai-martin knaak wrote: > Getting a GPS location when at an unknown position consumes a fair amount of > computational power (to find the satellites). So this is a modified proposal > for less energy consumption: Just check for an incoming SMS once a day. Only > if the owner considers the bike as stolen, GPS may spring into action. > How cheap a service contract can you get for the sim card? Unless you can get a per-SMS plan or something, after a year or two you may be approaching a non-trivial percentage of the cost of replacement. While the tech solution is definitely cooler, covering the bike under a renter's or home owner's insurance policy may be cheaper and easier. Jared ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)
David C. Kerber wrote: > Remember what the original suggestion was: have the device wake up for a > few seconds once a day and send a message as to where it is (or maybe only > send that message if it's not where it's supposed to be). Getting a GPS location when at an unknown position consumes a fair amount of computational power (to find the satellites). So this is a modified proposal for less energy consumption: Just check for an incoming SMS once a day. Only if the owner considers the bike as stolen, GPS may spring into action. > Maybe sneak a wire through a tiny hole in the seat post and attach it to > the bottom of the saddle? Quality of GPS detection is indeed a potential problem. The stolen bike might stand somewhere in the basement. So how about this: Add a motion sensor to the device. If an "stolen" SMS was received and there is currently no useful GPS signal, wait silently until the bike is moved, then check again. ---<)kaimartin(>--- -- Kai-Martin Knaak Öffentlicher PGP-Schlüssel: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53 ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)
> Same as with the lights. Either from a dynamo, or from batteries charged at > home. For bonus points, make it charge by induction while sitting inside the seat pole. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)
David SMITH wrote: > Where does the power come from? Same as with the lights. Either from a dynamo, or from batteries charged at home. > How long would it last between recharges? Can be pretty long. The device can be completely shut down except for a real time clock. It just needs to wake up once a day to check for incoming SMS. Only if the SMS tells that the owner considers the bike as stolen, it needs to activate current consuming GPS. > Remember that Li-Ion batteries have a nasty habit of self-discharging, Use NiCd instead? > and if you've gone to the expense of getting a super-light carbon fibre > bike frame, you're unlikely to want to add lots of weight with a large > battery. Many expensive bikes are mountain bikes, dirt jumpers and the like. These are and far from super light weight. Also remember, a decent lock is about 1.5 kg. I see next to every expensive looking bike with such a lock. ---<)kaimartin(>--- -- Kai-Martin Knaak Öffentlicher PGP-Schlüssel: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53 ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)
Remember what the original suggestion was: have the device wake up for a few seconds once a day and send a message as to where it is (or maybe only send that message if it's not where it's supposed to be). Considering that a typical bike-mounted gps (Garmin Edge 305, for example) can run for several hours on 3xAA batteries, including gps, cadence, heartrate and speed sensors, along with a continuous display, I think a couple of AA batteries would power this thing for several months or even years, at a few seconds per day. And if you can tie it in to Shimano's DI-2 power pack, it will have its power routinely recharged by the user every few weeks for other purposes any way. IOW, I think it sounds quite practical. Now if we can just figure out a way of getting the signal out of a metal frame like mine... Maybe sneak a wire through a tiny hole in the seat post and attach it to the bottom of the saddle? > -Original Message- > From: geda-user-boun...@moria.seul.org > [mailto:geda-user-boun...@moria.seul.org] On Behalf Of David SMITH > Sent: Thursday, May 13, 2010 8:59 AM > To: gEDA user mailing list > Subject: gEDA-user: OT: Bike Alarms (was: Re: Copper-free > area in footprint) > > John Griessen wrote: > > David C. Kerber wrote: > > > If you've got a carbon frame, you could drop it into the > seat tube, > > > where it would never be seen, and therefore never removed by a > > > thief... > > > > This really does sound like a product since bikes can cost > these days. > > Not to put too much of a spanner in the works, but... > > Where does the power come from? How long would it last > between recharges? > > I can't see much of a market if you have to remove the saddle > and turn the bike upside down to extract the device every > week to recharge the battery, especially if it's sitting > unused in the garage. People will forget to do it, and then > the device is rendered impotent. > > Remember that Li-Ion batteries have a nasty habit of > self-discharging, and if you've gone to the expense of > getting a super-light carbon fibre bike frame, you're > unlikely to want to add lots of weight with a large battery. > > > ___ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)
John Griessen wrote: > David C. Kerber wrote: > > If you've got a carbon frame, you could drop it into the > > seat tube, where it would never be seen, and therefore never > > removed by a thief... > > This really does sound like a product since bikes can cost these days. Not to put too much of a spanner in the works, but... Where does the power come from? How long would it last between recharges? I can't see much of a market if you have to remove the saddle and turn the bike upside down to extract the device every week to recharge the battery, especially if it's sitting unused in the garage. People will forget to do it, and then the device is rendered impotent. Remember that Li-Ion batteries have a nasty habit of self-discharging, and if you've gone to the expense of getting a super-light carbon fibre bike frame, you're unlikely to want to add lots of weight with a large battery. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
