Hello
I would like to learn how to build menus to be used with encoders and buttons.
I have an I²C LCD 16×2 which I have been able to setup and use with the LiquidCrystal_I2C library.
I have read various posts about how to create a menu but I think the best way for me would be using libraries and examples and learn from that. I have downloaded a three libraries so far (arduino menu, MENWIZ and Liquidmenu).
the example "I_I2C_menu" in Liquidmenu library is helpful as it gives clear instructions on how to adapt the code for the I2C library:
- 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.
I have made these changes and this example works fine. However I then tried to adapt other examples using the same methods and they do not compile. For example :
#include <LiquidCrystal_I2C.h>
#include <LiquidMenu.h>
#include <EEPROM.h>
#include "Button.h"
// The I2C LCD object
LiquidCrystal_I2C lcd(0x3F, 16, 2);
// Button objects instantiation
const bool pullup = true;
Button left(5, pullup);
Button right(7, pullup);
Button up(8, pullup);
Button down(9, pullup);
Button enter(10, pullup);
// Pin definitions and variables for their state.
const byte pin6 = 6;
byte pin6_level = 0;
const byte pinA0 = A0;
byte pinA0_value = 0;
const byte pinA1 = A1;
byte pinA1_value = 0;
// The analog reading sample period in seconds.
// It is later overwritten by it's EEPROM value.
unsigned short sample_period = 2;
// Text used for indication for the save lines.
char* input_saved;
char* output_saved;
enum FunctionTypes {
increase = 1,
decrease = 2,
};
// A LiquidLine object can be used more that once.
LiquidLine back_line(11, 1, "/BACK");
LiquidLine welcome_line1(1, 0, "LiquidMenu ", LIQUIDMENU_VERSION);
LiquidLine welcome_line2(1, 1, "System example");
LiquidScreen welcome_screen(welcome_line1, welcome_line2);
// These lines direct to other menus.
LiquidLine outputs_line(0, 0, "/Outputs");
LiquidLine inputs_line(0, 1, "/Inputs");
LiquidScreen io_screen(outputs_line, inputs_line);
// This is the first menu.
LiquidMenu main_menu(lcd, welcome_screen, io_screen, 1);
LiquidLine pin6_line(0, 0, "Pin 6: ", pin6_level);
LiquidScreen pin6_screen(pin6_line);
LiquidLine oSave_line(0, 0, "Save", output_saved);
LiquidScreen oSecondary_screen(oSave_line, back_line);
// This is the second menu.
LiquidMenu outputs_menu(lcd, pin6_screen, oSecondary_screen);
LiquidLine pinA0_line(0, 0, "Pin A0: ", pinA0_value);
LiquidLine pinA1_line(0, 1, "Pin A1: ", pinA1_value);
LiquidScreen pinsA0_A1_screen(pinA0_line, pinA1_line);
LiquidLine iSample_line(0, 0, "Sample: ", sample_period, "s");
LiquidLine iSave_line(0, 1, "Save", input_saved);
LiquidScreen iSecondary_screen(iSample_line, iSave_line, back_line);
// And this is the final third menu.
LiquidMenu inputs_menu(lcd, pinsA0_A1_screen, iSecondary_screen);
/*
* LiquidSystem object combines the LiquidMenu objects to form
* a menu system. It provides the same functions as LiquidMenu
* with the addition of add_menu() and change_menu().
*/
LiquidSystem menu_system(main_menu, outputs_menu, inputs_menu);
// Checks all the buttons.
void buttonsCheck() {
if (right.check() == LOW) {
menu_system.next_screen();
}
if (left.check() == LOW) {
menu_system.previous_screen();
}
if (up.check() == LOW) {
menu_system.call_function(increase);
}
if (down.check() == LOW) {
menu_system.call_function(decrease);
}
if (enter.check() == LOW) {
menu_system.switch_focus();
}
}
// Callback function that will be attached to back_line.
void go_back() {
// This function takes reference to the wanted menu.
menu_system.change_menu(main_menu);
}
void goto_outputs_menu() {
menu_system.change_menu(outputs_menu);
}
void goto_inputs_menu() {
menu_system.change_menu(inputs_menu);
}
void increase_pin6() {
if (pin6_level < 225) {
pin6_level += 25;
} else {
pin6_level = 250;
}
analogWrite(pin6, pin6_level);
output_saved = (char*)" ";
}
void decrease_pin6() {
if (pin6_level > 25) {
pin6_level -= 25;
} else {
pin6_level = 0;
}
analogWrite(pin6, pin6_level);
output_saved = (char*)" ";
}
void save_input() {
EEPROM.put(11, sample_period);
input_saved = (char*)" *";
}
void save_output() {
EEPROM.put(9, pin6_level);
output_saved = (char*)" *";
}
void increase_samplePeriod() {
if (sample_period < 10) {
sample_period++;
input_saved = (char*)" ";
}
}
void decrease_samplePeriod() {
if (sample_period > 0) {
sample_period--;
input_saved = (char*)" ";
}
}
void setup() {
Serial.begin(250000);
pinMode(pin6, OUTPUT);
// Reads the values recorded in the EEPROM
EEPROM.get(9, pin6_level);
EEPROM.get(11, sample_period);
analogWrite(pin6, pin6_level);
// This is the I2C LCD object initialization.
lcd.init();
lcd.backlight();
// This methid needs to be called when using an I2C display library.
menu.init();
back_line.set_focusPosition(Position::LEFT);
back_line.attach_function(1, go_back);
back_line.attach_function(2, go_back);
outputs_line.attach_function(1, goto_outputs_menu);
outputs_line.attach_function(2, goto_outputs_menu);
inputs_line.attach_function(1, goto_inputs_menu);
inputs_line.attach_function(2, goto_inputs_menu);
pin6_line.attach_function(increase, increase_pin6);
pin6_line.attach_function(decrease, decrease_pin6);
oSave_line.attach_function(1, save_output);
oSave_line.attach_function(2, save_output);
iSave_line.attach_function(1, save_input);
iSave_line.attach_function(2, save_input);
iSample_line.attach_function(increase, increase_samplePeriod);
iSample_line.attach_function(decrease, decrease_samplePeriod);
input_saved = (char*)" *";
output_saved = (char*)" *";
menu_system.update();
}
void loop() {
buttonsCheck();
static unsigned long lastMillis_sample = 0;
if (millis() - lastMillis_sample > (sample_period * 1000)) {
lastMillis_sample = millis();
pinA0_value = analogRead(pinA0);
pinA1_value = analogRead(pinA1);
menu_system.update();
}
}
I get this error message:
H_system_menu:226: error: 'menu' was not declared in this scope
menu.init();
^
exit status 1
'menu' was not declared in this scope
the code of the "I_I2C_menu" is pretty much the same and I have used the same libraries but I do not get this message.
Any advice please?
