Arduino BarGraph

  
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The bar graph - a series of LEDs in a line, such as you see on an audio display - is a common hardware display for analog sensors. It`s made up of a series of LEDs in a row, an analog input like a potentiometer, and a little code in between. You can buy multi-LED bar graph displays fairly cheaply, like this one. This tutorial demonstrates how to
Arduino BarGraph - schematic

control a series of LEDs in a row, but can be applied to any series of digital outputs. The sketch works like this: first you read the input. You map the input value to the output range, in this case ten LEDs. Then you set up a for loop to iterate over the outputs. If the output`s number in the series is lower than the mapped input range, you turn it on. If not, you turn it off.



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