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lib/LiquidCrystal_I2C/examples/VerticalBarGraph/VerticalBarGraph.ino

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+/*
+  NAME:
+  Demo sketch for Vertical Bar Graph
+
+  DESCRIPTION:
+  The sketch demonstrates usage of LiquidCrystal_I2C library version 2.x
+  for programing vertical graphs, which mimics histogram.
+  * 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 vertical graphs from one row graph to full rows
+    graph of the display.
+  * 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);
+
+// Cursor coordinates and character row pattern for progress bar
+const byte graphCol = lcdCols - 1;  // In this column the graph is displayed
+const int graphDelay = 200;  // Delay between graph values in ms
+const int demoDelay  = 3000; // Delay between demos in ms
+
+// Demo parameters
+const char  graphType[] = " Col(s) Graph";
+
+// Demo variables
+byte graphPixelsCur, graphPixelsMax;
+
+// Function for displaying graph label
+void printLabel(byte rows) {
+  const byte labelCol = 0;
+  const byte labelRow = 0;
+  // Create label
+  char labelText[graphCol];
+  sprintf(labelText, "%1u%s", rows, graphType);
+  // Display label on clear display
+  lcd.clear();
+  lcd.setCursor(labelCol, labelRow);
+  lcd.print(labelText);
+  
+}
+
+// Function for displaying graph value
+void printValue(byte value) {
+  const byte valueWidth = 2; // Max. digits in value
+  const byte valueCol = graphCol - valueWidth - 1;
+  const byte valueRow = 1;
+  // Create value
+  char valueFormat[4], valueText[valueWidth + 1];
+  sprintf(valueFormat, "%%%1uu", valueWidth);
+  sprintf(valueText, valueFormat, value);
+  // Display label on clear display
+  lcd.clear(valueRow, valueCol, valueWidth);
+  lcd.setCursor(valueCol, valueRow);
+  lcd.print(valueText);
+}
+
+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()
+{
+  for(byte graphHight = 1; graphHight <= lcdRows; graphHight++) {
+    graphPixelsMax = graphHight * LCD_CHARACTER_VERTICAL_DOTS;
+    printLabel(graphHight);
+    for (byte i = graphPixelsMax; i > 0; i--) {
+      graphPixelsCur = i - 1;
+      printValue(graphPixelsCur);
+      lcd.draw_vertical_graph(graphHight - 1, graphCol, graphHight, graphPixelsCur);
+      delay(graphDelay);
+    }
+    // Ascending graph values
+    for (byte i = 0; i < graphPixelsMax; i++) {
+      graphPixelsCur = i;
+      printValue(graphPixelsCur);
+      lcd.draw_vertical_graph(graphHight - 1, graphCol, graphHight, graphPixelsCur);
+      delay(graphDelay);
+    }
+    delay(demoDelay);
+  }
+}