Re: gEDA-user: OT: Bike Alarms

["David C. Kerber" <dkerber@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

> -----Original Message-----
> From: geda-user-bounces@xxxxxxxxxxxxxx 
> [mailto:geda-user-bounces@xxxxxxxxxxxxxx] On Behalf Of David SMITH
> Sent: Thursday, May 13, 2010 11:02 AM
> To: gEDA user mailing list
> Subject: Re: gEDA-user: OT: Bike Alarms
> 

> Of course, we also have the problem of getting a decent  GPS 
> fix, since if it's stolen, it will need to get enough signal 
> to report its position, and if it's being stored inside a 
> building, that's going to be very difficult, even before you 
> take the possibility of a metal-framed bike into account.
> 

Getting a signal inside a garage or other building is probably the biggest hurdle.


> > 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.
> 
> I doubt that the cadence/heartrate/speed measurement is going 
> to have any significant effect on the power consumption - 

Probably not, but the display will.


> most non-GPS cycle computers will do that for months if not 
> years on a coin cell.  It's the GPS and GSM that suck the power.

Agreed.

> 
> > 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.
> 
> True, but then it becomes more difficult to hide inside the 
> frame, and get wires into/out of the frame.

On many frames, those wires run through the frame already, so if you can tap them there, it won't be very obvious unless someone is really looking closely.

D


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