Posted on Feb 6, 2014

The device will be placed on the back wheel of the bicycle. Since the LED`s and other components run off of a lithium-ion battery, it stands independently, attached to the spokes of the rear wheel. In the design, all components are placed on the spokes of the wheel, with the exception of the magnets activating the hall effect sensor.

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The battery, Arduino, LED construction, are all placed on the spokes and spin freely. Before designing how the components would fit together, it was imperative to draw out a circuit schematic. If we don`t know how the components will be wired together, where the wires will be, and which components are connected to each other, then how should we design the components` housing We came up with the following schematic as the best solution: The components labeled "D" are wired to the different pins on the Arduino. The pins are connected to the LED`s through transistors and 1. 5K resistors. The component labelled "S" is the Hall Effect Sensor. In order to attach the components to the wheel, we created housing for the components to fit into and mount onto the spokes of the wheel, made out of clear acrylic. We bought a clear sheet of acrylic, designed a finger joint box that fits together, then glued the parts of the box that received more stress, although it worked pretty well without the glue as well. We used a laser cutter to cut the pieces out of the acrylic and then snapped them together. The design was as follows: Due to difficultly getting into the lab with the laser cutter and limited time, we didn`t create the same sort of housing for the Arduino circuit boards and battery as we did for the LED`s, but if we had more time, we would have. Instead, we made a rough and quick wooden box, glued together with holes drilled into...

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