You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
4.0 KiB
127 lines
4.0 KiB
/*
|
|
* LiquidMenu library - I2C_menu.ino
|
|
* IMPORTANT: To configure the library for I2C connection define I2C
|
|
* as "true" in the "LiquidMenu_config.h" file.
|
|
*
|
|
* This is the "hello_menu" example configured for I2C connection.
|
|
*
|
|
* The difference in using an I2C display library instead of the
|
|
* official LiquidCrystal library is that void LiquidMenu::init()
|
|
* method needs to be called in setup() after the I2C display library
|
|
* is initialized. The other difference is that I2C needs to be defined
|
|
* as "true" in the "LiquidMenu_config.h" file.
|
|
*
|
|
* The circuit:
|
|
* https://github.com/VasilKalchev/LiquidMenu/blob/master/examples/I_I2C_menu/hello_menu.png
|
|
* - PCF8574 module SCL to Arduino pin A5
|
|
* - PCF8574 module SDA to Arduino pin A4
|
|
* - PCF8574 module VCC to Arduino 5V
|
|
* - PCF8574 module GND to Arduino GND
|
|
*
|
|
* Created March 27, 2017
|
|
* by Vasil Kalchev
|
|
*
|
|
* https://github.com/VasilKalchev/LiquidMenu
|
|
*
|
|
*/
|
|
|
|
#include <Wire.h>
|
|
// The I2C LCD library
|
|
#include <LiquidCrystal_I2C.h>
|
|
// The menu wrapper library
|
|
#include <LiquidMenu.h>
|
|
|
|
// The I2C LCD object
|
|
LiquidCrystal_I2C lcd(0x3F, 16, 2);
|
|
|
|
/*
|
|
* Variable 'analogReading' is later configured to
|
|
* be printed on the display. 'lastAnalogReading'
|
|
* is used to check if the variable has changed.
|
|
*/
|
|
const byte analogPin = A1;
|
|
unsigned short analogReading = 0;
|
|
unsigned short lastAnalogReading = 0;
|
|
|
|
/*
|
|
* Variables used for periodic execution of code. The first one is the period
|
|
* in milliseconds and the second one is the last time the code executed.
|
|
*/
|
|
unsigned int period_check = 1000;
|
|
unsigned long lastMs_check = 0;
|
|
|
|
unsigned int period_nextScreen = 5000;
|
|
unsigned long lastMs_nextScreen = 0;
|
|
|
|
/*
|
|
* LiquidLine objects represent a single line of text and/or variables
|
|
* on the display. The first two parameters are the column and row from
|
|
* which the line starts, the rest of the parameters are the text and/or
|
|
* variables that will be printed on the display. They can be up to four.
|
|
*/
|
|
// Here the line is set to column 1, row 0 and will print the passed
|
|
// string and the passed variable.
|
|
LiquidLine welcome_line1(1, 0, "LiquidMenu ", LIQUIDMENU_VERSION);
|
|
// Here the column is 3, the row is 1 and the string is "Hello Menu".
|
|
LiquidLine welcome_line2(1, 1, "Hello Menu I2C");
|
|
|
|
/*
|
|
* LiquidScreen objects represent a single screen. A screen is made of
|
|
* one or more LiquidLine objects. Up to four LiquidLine objects can
|
|
* be inserted from here, but more can be added later in setup() using
|
|
* welcome_screen.add_line(someLine_object);.
|
|
*/
|
|
// Here the LiquidLine objects are the two objects from above.
|
|
LiquidScreen welcome_screen(welcome_line1, welcome_line2);
|
|
|
|
// Here there is not only a text string but also a changing integer variable.
|
|
LiquidLine analogReading_line(0, 0, "Analog: ", analogReading);
|
|
LiquidScreen secondary_screen(analogReading_line);
|
|
|
|
/*
|
|
* The LiquidMenu object combines the LiquidScreen objects to form the
|
|
* menu. Here it is only instantiated and the screens are added later
|
|
* using menu.add_screen(someScreen_object);. This object is used to
|
|
* control the menu, for example: menu.next_screen(), menu.switch_focus()...
|
|
*/
|
|
LiquidMenu menu(lcd);
|
|
|
|
|
|
void setup() {
|
|
Serial.begin(250000);
|
|
|
|
pinMode(analogPin, INPUT);
|
|
|
|
// This is the I2C LCD object initialization.
|
|
lcd.init();
|
|
lcd.backlight();
|
|
|
|
// Menu initialization.
|
|
menu.init();
|
|
|
|
// This is the method used to add a screen object to the menu.
|
|
menu.add_screen(welcome_screen);
|
|
menu.add_screen(secondary_screen);
|
|
}
|
|
|
|
void loop() {
|
|
// Periodic reading of the analog pin.
|
|
if (millis() - lastMs_check > period_check) {
|
|
lastMs_check = millis();
|
|
analogReading = analogRead(analogPin);
|
|
/*
|
|
* Check if the analog value have changed
|
|
* and update the display if it has.
|
|
*/
|
|
if (analogReading != lastAnalogReading) {
|
|
lastAnalogReading = analogReading;
|
|
menu.update();
|
|
}
|
|
}
|
|
|
|
// Periodic switching to the next screen.
|
|
if (millis() - lastMs_nextScreen > period_nextScreen) {
|
|
lastMs_nextScreen = millis();
|
|
menu.next_screen();
|
|
}
|
|
}
|
|
|