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Picture of Bike Alert
This morning, while riding my bike, I thought, "Wouldn't it be nice to know when someone is approaching from behind?" I didn't want to use mirrors or funny glasses, so I decided to use an ultrasonic transducer to trigger a buzzer when approached.

This involves a Ping transducer, Arduino, buzzer, switch, 9 volt battery and enclosure.

Thanks to the world of 3D printing, these things don't have to be force fit into a black box anymore.

For the design and print files of the box (created in Autodesk's 123d software--free):
http://www.thingiverse.com/thing:115074

Step 1:

Picture of
I started by piling the major components together to see what sort of space it would take.
 
When I am ready you will be the 1st to know my friend ! Until then I will keep learning from the Pro's !
Build_it_Bob
Great idea Mike ! I like your custom enclosure too ...you are the man with the 3d printer!
I always enjoy your creative projects ...keep them coming and many thanks for sharing.
Build_it_Bob
MikeTheMaker (author)  Build_it_Bob2 years ago
Thank you! They have some really cool prizes in the "Bikes and Wheels" contest, so I thought I'd give it a shot.
Hopefully, you can document and publish a project one of these days :)