2008 June | College Basketball

Wheel Covers

Under the plastic surface of the click wheel, there are four mechanical buttons (Menu, again, fast forward, Play / Pause), and there is a button on the center (selection).

Click Wheel face

There are five buttons and five corresponding contacts on the motherboard. When pressed, for example, the right side of the wheel while listening to a song, the front wheel pushes the button. The underside of each rubber button is metal, so pressing it completes the circuit corresponding to the motherboard. The motherboard tells the processor circuit is completed and the processor tells the operating system to move quickly on the track.

Playing the role of sensitive click wheel allows scrolling through lists, adjust volume and fast forward through a song by moving your finger around wheel stops. It works like a laptop touchpad. In fact, the company that supplied the Click Wheel for the 4G iPod was Synaptics, best known for making touchpad laptop. For the 5G, Apple created its own proprietary Click Wheel design based on the capacitive sensing principle as the previous Synaptics designed Click Wheel.

Under the plastic cover of the click wheel, there is a membrane integrated with metal chains. When to meet the channel, a location direction has been created, as the coordinates on a graph.

Basically, a capacitive sensing system works like this: The system controller provides an electric current to the network. Metal chains that form the network are conductors – they conduct electricity. When another conductor – for example, the finger – he approached the door, current wants to go toe to complete the circuit. But there is a piece of nonconductive plastic in the way – the Click Wheel cover. What the charge accumulates at the point of grid is closer to the finger. This buildup of electrical charge between two conductors is called capacity.
The rapprochement between the two conductors are without touching,
more capacity.

The "detection" system comes with the driver. The driver of the click wheel (see above) is scheduled to measure changes in capacity. More changes in capacity sometime in the finger should be. When the driver detects a change in capacity, it sends a signal to the microprocessor. As we move fingers around the wheel, the burden of accumulating wheel moves around with her. Whenever the driver's ability sense at some point, a signal is sent. Thus the Click Wheel can detect speed of motion – the faster you move your finger around wheel, the more compact flow signals that are sent. And as the microprocessor receives the signals, the corresponding action is performed – the increase in volume, for example. When the finger stops moving around the wheel, the controller stops detecting changes in capacitance, and sending signals, the microprocessor and increase the volume.

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Article Source: ArticlesBase.com – How Does an Ipod Click Wheel Works?

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