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lib/LiquidCrystal_I2C/examples/Histogram/Histogram.ino

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+/*
+  NAME:
+  Demo sketch for Histogram composed of Vertical Bar Graphs
+
+  DESCRIPTION:
+  The sketch demonstrates usage of LiquidCrystal_I2C library version 2.x
+  for programing histograms with help of vertical graphs.
+  * The sketch is intended preferrably for 16x2 LCD, but can be configured
+    for 20x4 LCDs just by uncommenting and commenting related sections.
+  * All graph values are displayed in number of vertical pixels.
+  * The sketch demostrates a histogram
+    - in second row with one row height
+    - in full display are with
+    with values changed randomly.
+  * The sketch is just for demonstration purposes, so that it is not
+    optimized for memory usage.
+
+  LICENSE:
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the MIT License (MIT).
+    
+  CREDENTIALS:
+  Author: Libor Gabaj
+  Version: 1.0.0
+  Updated: 01.03.2015
+*/
+
+/*  Needed libraries
+    Dispite the LCD library includes Wire library, the ArduinoIDE does not
+    includes nested libraries, if they are not in the same folder.
+*/
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+// LCD address and geometry for LCD 1602
+const byte lcdAddr = 0x27;  // Typical address of I2C backpack for 1602
+const byte lcdCols = 16;    // Number of characters in a row of display
+const byte lcdRows = 2;     // Number of lines of display
+
+// LCD address and geometry for LCD 2004
+//const byte lcdAddr = 0x3F;  // Typical address of I2C backpack for 2004
+//const byte lcdCols = 20;    // Number of characters in a row of display
+//const byte lcdRows = 4;     // Number of lines of display
+
+// Initialize library and setting LCD geometry
+LiquidCrystal_I2C lcd(lcdAddr, lcdCols, lcdRows);
+
+// Demo constants
+const int graphDelay = 100;  // Delay between histograms
+const int demoTime   = 5000; // Showing time of a demo
+
+// Demo variables
+byte graphPixelsCur, graphPixelsMax;
+unsigned long demoStart;
+
+void setup()
+{
+  // Initialize LCD
+  lcd.init();
+  lcd.backlight();  // Switch on the backlight LED, if any or wired
+  
+  /*  Initialize graph
+      * Macro is defined in LiquidCrystal_I2C library.
+      * Function uses all 8 custom character positions (0-7)
+        and creates custom characters for displaying vertical bar.
+  */
+  lcd.init_bargraph(LCDI2C_VERTICAL_BAR_GRAPH);
+}
+
+void loop()
+{
+  // Demo 1: One row histogram
+  lcd.clear();
+  lcd.print("Histogram");
+  graphPixelsMax = LCD_CHARACTER_VERTICAL_DOTS;
+  demoStart = millis();
+  while(millis() - demoStart < demoTime) {
+    for(byte graphCol = 0; graphCol < lcdCols; graphCol++) {
+      graphPixelsCur = random(0, graphPixelsMax);
+      lcd.draw_vertical_graph(1, graphCol, 1, graphPixelsCur);
+    }
+    delay(graphDelay);
+  }
+  // Demo 2: Full display histogram
+  lcd.clear();
+  graphPixelsMax = lcdRows * LCD_CHARACTER_VERTICAL_DOTS;
+  demoStart = millis();
+  while(millis() - demoStart < demoTime) {
+    for(byte graphCol = 0; graphCol < lcdCols; graphCol++) {
+      graphPixelsCur = random(0, graphPixelsMax);
+      lcd.draw_vertical_graph(lcdRows - 1, graphCol, lcdRows, graphPixelsCur);
+    }
+    delay(graphDelay);
+  }
+}