It's a rather lengthy code, it has to be broken into two replies.
PART A:
/***************************************************************************************
Name : LCD Button Shield Menu
Author : Paul Siewert
Created : June 14, 2016
Last Modified: June 14, 2016
Version : 1.0
Notes : This code is for use with an Arduino Uno and LCD/button shield. The
intent is for anyone to use this program to give them a starting
program with a fully functional menu with minimal modifications
required by the user.
License : This program is free software. You can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
***************************************************************************************/
/*
This program is designed to get you as close as possible to a finished menu for the standard Arduino Uno LCD/button shield. The only required modifications
are to add as menu items to the master menu (menuItems array) and then modify/adjust the void functions below for each of those selections.
*/
// You can have up to 10 menu items in the menuItems[] array below without having to change the base programming at all. Name them however you'd like. Beyond 10 items, you will have to add additional "cases" in the switch/case
// section of the operateMainMenu() function below. You will also have to add additional void functions (i.e. menuItem11, menuItem12, etc.) to the program.
String menuItems[] = {"ITEM 1", "ITEM 2", "ITEM 3", "ITEM 4", "ITEM 5", "ITEM 6"};
// Navigation button variables
int readKey;
// Menu control variables
int menuPage = 0;
int maxMenuPages = round(((sizeof(menuItems) / sizeof(String)) / 2) + .5);
int cursorPosition = 0;
// Creates 3 custom characters for the menu display
byte downArrow[8] = {
0b00100, // *
0b00100, // *
0b00100, // *
0b00100, // *
0b00100, // *
0b10101, // * * *
0b01110, // ***
0b00100 // *
};
byte upArrow[8] = {
0b00100, // *
0b01110, // ***
0b10101, // * * *
0b00100, // *
0b00100, // *
0b00100, // *
0b00100, // *
0b00100 // *
};
byte menuCursor[8] = {
B01000, // *
B00100, // *
B00010, // *
B00001, // *
B00010, // *
B00100, // *
B01000, // *
B00000 //
};
#include <LiquidCrystal_I2C.h>
// Setting the LCD shields pins
LiquidCrystal_I2C lcd(0x27, 20, 4);
void setup() {
// Initializes serial communication
Serial.begin(9600);
//--------------------------------------------------------
lcd.init(); //initialize the lcd
lcd.backlight(); //open the backlight
lcd.setCursor(5, 0);
lcd.print("System");
lcd.setCursor(0, 1);
lcd.print("intitializing...");
//--------------------------------------------------------
// Creates the byte for the 3 custom characters
lcd.createChar(0, menuCursor);
lcd.createChar(1, upArrow);
lcd.createChar(2, downArrow);
}
void loop() {
mainMenuDraw();
drawCursor();
operateMainMenu();
Serial.println(analogRead(A0));
}
// This function will generate the 2 menu items that can fit on the screen. They will change as you scroll through your menu. Up and down arrows will indicate your current menu position.
void mainMenuDraw() {
Serial.print(menuPage);
lcd.clear();
lcd.setCursor(1, 0);
lcd.print(menuItems[menuPage]);
lcd.setCursor(1, 1);
lcd.print(menuItems[menuPage + 1]);
if (menuPage == 0) {
lcd.setCursor(15, 1);
lcd.write(byte(2));
} else if (menuPage > 0 and menuPage < maxMenuPages) {
lcd.setCursor(15, 1);
lcd.write(byte(2));
lcd.setCursor(15, 0);
lcd.write(byte(1));
} else if (menuPage == maxMenuPages) {
lcd.setCursor(15, 0);
lcd.write(byte(1));
}
}
// When called, this function will erase the current cursor and redraw it based on the cursorPosition and menuPage variables.
void drawCursor() {
for (int x = 0; x < 2; x++) { // Erases current cursor
lcd.setCursor(0, x);
lcd.print(" ");
}
// The menu is set up to be progressive (menuPage 0 = Item 1 & Item 2, menuPage 1 = Item 2 & Item 3, menuPage 2 = Item 3 & Item 4), so
// in order to determine where the cursor should be you need to see if you are at an odd or even menu page and an odd or even cursor position.
if (menuPage % 2 == 0) {
if (cursorPosition % 2 == 0) { // If the menu page is even and the cursor position is even that means the cursor should be on line 1
lcd.setCursor(0, 0);
lcd.write(byte(0));
}
if (cursorPosition % 2 != 0) { // If the menu page is even and the cursor position is odd that means the cursor should be on line 2
lcd.setCursor(0, 1);
lcd.write(byte(0));
}
}
if (menuPage % 2 != 0) {
if (cursorPosition % 2 == 0) { // If the menu page is odd and the cursor position is even that means the cursor should be on line 2
lcd.setCursor(0, 1);
lcd.write(byte(0));
}
if (cursorPosition % 2 != 0) { // If the menu page is odd and the cursor position is odd that means the cursor should be on line 1
lcd.setCursor(0, 0);
lcd.write(byte(0));
}
}
}
void operateMainMenu() {
int activeButton = 0;
while (activeButton == 0) {
int button;
readKey = analogRead(0);
if (readKey < 790) {
delay(100);
readKey = analogRead(0);
}
button = evaluateButton(readKey);
switch (button) {
case 0: // When button returns as 0 there is no action taken
break;
case 1: // This case will execute if the "forward" button is pressed
button = 0;
switch (cursorPosition) { // The case that is selected here is dependent on which menu page you are on and where the cursor is.
case 0:
menuItem1();
break;
case 1:
menuItem2();
break;
case 2:
menuItem3();
break;
case 3:
menuItem4();
break;
case 4:
menuItem5();
break;
case 5:
menuItem6();
break;
case 6:
menuItem7();
break;
case 7:
menuItem8();
break;
case 8:
menuItem9();
break;
case 9:
menuItem10();
break;
}
activeButton = 1;
mainMenuDraw();
drawCursor();
break;
case 2:
button = 0;
if (menuPage == 0) {
cursorPosition = cursorPosition - 1;
cursorPosition = constrain(cursorPosition, 0, ((sizeof(menuItems) / sizeof(String)) - 1));
}
if (menuPage % 2 == 0 and cursorPosition % 2 == 0) {
menuPage = menuPage - 1;
menuPage = constrain(menuPage, 0, maxMenuPages);
}
if (menuPage % 2 != 0 and cursorPosition % 2 != 0) {
menuPage = menuPage - 1;
menuPage = constrain(menuPage, 0, maxMenuPages);
}
cursorPosition = cursorPosition - 1;
cursorPosition = constrain(cursorPosition, 0, ((sizeof(menuItems) / sizeof(String)) - 1));
mainMenuDraw();
drawCursor();
activeButton = 1;
break;
case 3:
button = 0;
if (menuPage % 2 == 0 and cursorPosition % 2 != 0) {
menuPage = menuPage + 1;
menuPage = constrain(menuPage, 0, maxMenuPages);
}
if (menuPage % 2 != 0 and cursorPosition % 2 == 0) {
menuPage = menuPage + 1;
menuPage = constrain(menuPage, 0, maxMenuPages);
}
cursorPosition = cursorPosition + 1;
cursorPosition = constrain(cursorPosition, 0, ((sizeof(menuItems) / sizeof(String)) - 1));
mainMenuDraw();
drawCursor();
activeButton = 1;
break;
}
}
}