From last research, I see breaking lock doesn’t take lots of time, so I decide to think about solutions with a bike or inside a bike.
And more I researched about existing bike alarms.
http://shoponspot.com/vibration-activated-120db-bicycle-anti-theft-security-alarm/
Almost are sound alarm system. I think if a thief brings huge electric grinder, he might not care the alarm sound and he could break it easily. So I think we need one more step that is to make a bike stop with sound alarming.
then how to sensor
how to activate and deactivate
There are some challenge things.
Almost existing alarm need to be installed outside of a bike. I think thieves shouldn’t know about it. They might prepare it. And , personally, I don’t want to make my bike look ugly with the alarm box. But installing inside of frame is really hard unless the bike is huge MTB has thick frame.
Also, I have some more ideas:
Taking thief’s face with hidden camera then send it to web.
Just put a NYPD sticker on frame.
When a bike stolen, twitt the bike information automatically.
Hidden GPS system send location info.





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