20 LED Bar-Graph Voltmeter Using Arduino Mega
Simple 20 LED Segment Bar-Graph Voltmeter , each LED display 0.25V, this circuit can measure 5V directly or it can measure higher voltage using resistor divider. Turns on a series of blue LEDs based on the value of an analog voltage input. This is a simple way to make a bar graph display. Though this graph uses 20 LEDs,
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