The main point of this project was to make the turning system but, I also did not want to machine anything. I didn't want to hammer, drill, mill, or even punch holes into things. I sourced as many parts as possible to prevent myself from making holes in anything. I did end up having to make 3 holes unfortunately. Oddly enough, not tooling anything proved extraordinarily difficult due to the fact that I wanted a custom system with off the shelf parts.
The items themselves are notably expensive. Considering however that a comparable light system from a retailer would cost you a lot more, I compromised on ease of use (i.e. no machining) to price. In fact, I could have done a lot more tooling to reduce the price of this build but, I wanted to see if I could get away with a minimal amount of tooling. So, let me apologize for the cost of the items up front.
I have noticed that newer and different items that would do just fine (and more cheaply) have arrived to market since I started this project. Oh well, I guess I should have just waited to start this project instead of slowly accumulating pieces for it.
When building this system, I posed a challenge for myself. I wanted to learn more about the Arduino (this is my first project with it), high power LEDs, and Li-Ion batteries. Granted, all the items I purchased for this project are overkill for the simple system of bike turning lights but, it was fun to learn about them.
On some very positive notes, the build can be used to make some really high powered flashlights. The LED enclosures can be used to make completely waterproof lighting systems that are super easy to build. No tooling necessary and only with slight modifications from this build. And finally, I hope that I will introduce new components to the hacker space with this Instructable. The LED enclosures are meant to be used in optics labs so having a super ultra geeky LED light system from laboratory equipment should give anyone at least some bragging rights. Even though your pocket book may be hurting because of it.