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Light-emitting diodes, also known as LEDs, have a wide range of uses, from communications and signaling, to illumination, and more. An LED, in a circuit board indicator context, is a type of diode that emits light when a voltage is applied to its two terminals. When LEDs are connected together in a circuit board indicator configuration, they can be used to signify an array of things, from alarms, to power-on/power-off, or even act as indicators.

LEDs can be used to create arrays, light bars, bar graphs or as a light effect source. In many cases, LEDs are used to create multi-colored arrays or displays, often referred to as “LED displays.” In these displays, each LED is individually lit up, and creates a multi-colored graphic. Depending on the circuit design, these arrays can be driven by small currents, making them great energy-savers versus traditional incandescent or fluorescent bulbs.

LEDs can be used in different types of applications, from linear light bars to alpha-numeric displays and more. They can be connected in an almost infinite number of combinations and driven in either series or parallel. Depending on the circuit design, a string of LEDs can be used as a light source for instrument panel indicators, as a power on/power off display, as an alarm indicator, to display numbers, letters and symbols, as a backlight for LCD displays, lighting up display boxes (such as the ones used in vending machines), or even as the centerpiece of a large-scale interactive display.

In addition to illuminating devices, LEDs can also be used as indicators. By connecting multiple LEDs together, they can be used as an indicator to signify something. For example, if an LED light is connected to a door lock or security system, it can indicate whether or not the door is open or closed, and if the security system is turned on or off.

LEDs can also be combined with other components to create light bars, which can serve as indicators for various conditions, such as when the water tank is full, or when a temperature threshold has been reached. The light bar may be composed of several different types of LED, each emitting a different color of light, and turning on and off in a specific order, giving the overall bar a sequence of illumination which can be used as an indicator.

Bar graphs are also made up of several LEDs, arranged in a linear fashion, forming a graph of sorts. These graphs can take many different forms, from VU meters, to signal strength indicators and more. Like other forms of LEDs, bar graphs can be driven in either parallel or series, and can be designed to be driven at different levels of current for a more accurate indication.

In summary, LED\'s are a versatile source of signal or light, and when used in a circuit board indicator configuration, they can be used in a multitude of applications, from linear light bars and bar graphs, to LEDs as a light effect source. A wide range of circuit designs can be used to power LED\'s, and when used in the right applications, they can offer a long-lasting, energy-efficient, and cost-effective solution.

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