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LEDs are a great way to make your PCBs look amazing. From Circuit Board Indicators to Arrays and Light Bars, LED lighting can help make your projects come to life. LED Bar Graphs are a unique way to display information on your circuit board, and are becoming increasingly popular. In this article, we’ll discuss the application field and working principles of LED Bar Graphs.

Application Field of LED Bar Graphs

LED Bar Graphs have a wide range of applications, from level indication, medical parameters monitoring, automotive indicators, industrial and household sensors all the way to complex control systems.

LED Bar Graphs are ideal for displaying numerical values from sensors such as motion and tilt detectors, temperature and pressure gauges, sound and light meters. They can also be used to display results from measurements and computations that have been performed on a certain device. For example, LEDs can be arranged in a bar graph form to provide an intuitive way of representing numerical values.

LED Bar Graphs are also becoming increasingly popular in home automation systems. NASA has been utilizing LED Bar Graphs to monitor and display various changes in the environment - such as changes in temperatures, radiation and oxygen levels. LEDs are also being used on aircraft and in smart cars to monitor and display various parameters, such as fuel levels and engine temperatures.

Working Principle of LED Bar Graphs

The basic principle behind LED Bar Graphs is to light up a series of LEDs based on the input from a sensor or measurement device. The total number of LEDs that light up corresponds to the numerical value of the measurement or computation. Thus, each LED in the bar graph will be associated with a different numerical value.

The input data is typically measured in an analog form, such as a voltage, current or resistance. The analog signal can then be converted to a digital one, using an analog-to-digital converter (ADC). The ADC will measure the analog input and convert it to the corresponding digital value, which is then used to light up the LEDs appropriately.

For example, if the input is 3.2 volts, then the ADC will convert this to the equivalent digital value. If the LED Bar Graph has 8 LEDs, then the voltage range could be split into 8 equal parts. This means that 3.2V would correspond to the 5th LED in the sequence, so it would be lit up.

Conclusion

LED Bar Graphs are a great way to make your PCBs look amazing. They have a wide range of applications and can be used to intuitively display numerical values in a highly visual way. The working principle of LED Bar Graphs is also fairly simple, with analog signals being converted to digital ones alongside with the help of an analog-to-digital converter.

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