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arduino-cli/libraries/LEDbar/examples/VUmeter/VUmeter.ino

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+/*****************************************************************
+| LEDbar Arduino library - based on the 74HC164 shift register   |
+| Developed and maintained by MCUdude                            |
+| https://github.com/MCUdude/LEDbar                              |            
+| Released to the public domain                                  |
+|                                                                |
+| VU meter example - Read analog pin A0 and display the level    |
+| on the LED bar.                                                |
+*****************************************************************/
+
+// Include the library code
+#include "LEDbar.h"
+
+// Pin definitions
+byte CLK = 5;
+byte DATA = 4;
+byte DIM = 3;
+byte analogPin = A0;
+
+// Constants
+const byte numberOfLEDs = 40; // My module has 40 LEDs
+
+// Global variables
+byte vuData = 0;
+
+// Initialize the library with dim pin
+LEDbar led(CLK, DATA, DIM);
+// Alternative without dim pin (tie the dimm pin on the LED bar to Vcc)
+//LEDbar led(CLK, DATA);
+
+
+void setup()
+{
+	// Initialize the LED bar with 40 LEDs
+	led.begin(numberOfLEDs);
+	
+	// Set the brightness to 100 (8-bit --> 0 - 255)
+	led.brightness(100);
+}
+
+
+void loop()
+{
+	// Map the analog value (0 - 1023 steps) to fit the LED bar (0 - 40 steps)
+	vuData = map(analogRead(analogPin), 0, 1023, 0, numberOfLEDs);
+	
+	// Display vuData on the LED bar
+	led.setLevel(vuData);
+	
+  // Alternative way to run from the oposite direction
+  //led.setLevel(-vuData);
+  
+  // Slow down a little
+  delay(5);
+}