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An LED is a semiconductor light source consisting of two parts, an anode and a cathode. When current is applied to the device, the electrons in the anode are energized and fill in the electron "holes" in the cathode. As the electrons pass through the components, they emit photons which create visible light. LED\'s are used in a variety of applications including automotive automotive headlights, signal lights, LED boards, LED displays, LED arrays, LED light bars, LED strips and LED bar graphs. They are also commonly used as signal indicator as well as a decorative display element.

LEDs used in Circuit Board Indicators

LEDs are used in many designs like an indicator on a circuit board. They can be used to indicate different electrical events on the board. For example, green LEDs can be used to indicate when the board is powered on or an orange LED can indicate that something is not working. When used in this capacity, the LEDs are very small and typically used in arrays, connected to a specific point on the circuit board.

LED Arrays and Light Bars

LED arrays are composed of multiple LEDs arranged in a parallel manner. They are usually connected to the main board via a simple circuit, called a multiplexed circuit, which can control the individual LEDs in the array. They are often used to provide a wide variety of effects, such as fading, flashing and alternating effects. LED light bars are similar to LED arrays, but also expand on this concept by providing a longer strip of LEDs which can be used to show different light effects.

LED Bar Graphs

LED bar graphs are also known as LED matrix bars and are composed of a series of separate LEDs arranged in a linear orientation. These LEDs are used to display various levels of output, measurement or progress on a board or console. They are mainly used for indicating the status of a task or process, or depicting the usage of some power or energy source. Bar graphs can be connected to a microcontroller that can control how much led light they output, as well as changing colors or flashing when certain conditions occur.

In conclusion, LED is a versatile light source that can be found in many different applications and can be used to indicate status, show progress or provide decorative effects. LEDs can be used in arrays, multiplexed circuits, light bars and bar graphs. They play an important role in industry and technology and can also be used for decorative purposes.

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