Re: gEDA-user: OT: Bike Alarms (was: Re: Copper-free area in footprint)

[kai-martin knaak <kmk@xxxxxxxxxxxxxxx>]

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
Ãffentlicher PGP-SchlÃssel:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53



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