XFCE_AND_HYPERLAND

2026-06-23 23:58:58 -05:00
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+How to make an LED bar graph. 
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+/*
+  LED bar graph
+
+  Turns on a series of LEDs based on the value of an analog sensor.
+  This is a simple way to make a bar graph display. Though this graph uses 10
+  LEDs, you can use any number by changing the LED count and the pins in the
+  array.
+
+  This method can be used to control any series of digital outputs that depends
+  on an analog input.
+
+  The circuit:
+  - LEDs from pins 2 through 11 to ground
+
+  created 4 Sep 2010
+  by Tom Igoe
+
+  This example code is in the public domain.
+
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/BarGraph
+*/
+
+// these constants won't change:
+const int analogPin = A0;   // the pin that the potentiometer is attached to
+const int ledCount = 10;    // the number of LEDs in the bar graph
+
+int ledPins[] = {
+  2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+};   // an array of pin numbers to which LEDs are attached
+
+
+void setup() {
+  // loop over the pin array and set them all to output:
+  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
+    pinMode(ledPins[thisLed], OUTPUT);
+  }
+}
+
+void loop() {
+  // read the potentiometer:
+  int sensorReading = analogRead(analogPin);
+  // map the result to a range from 0 to the number of LEDs:
+  int ledLevel = map(sensorReading, 0, 1023, 0, ledCount);
+
+  // loop over the LED array:
+  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
+    // if the array element's index is less than ledLevel,
+    // turn the pin for this element on:
+    if (thisLed < ledLevel) {
+      digitalWrite(ledPins[thisLed], HIGH);
+    }
+    // turn off all pins higher than the ledLevel:
+    else {
+      digitalWrite(ledPins[thisLed], LOW);
+    }
+  }
+}