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	- Project: "Button Navigation"
	- Source Code NOT compiled for: Arduino Uno
	- Source Code created on: 2024-06-07 10:35:14

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* lcd display i2c  20x4  button pin11 UP LOW menu up */
	/* button pin10 UP LOW menu enter  button pin12UP LOW */
	/* menu down  menu   MaxTemp ->max_temp -= 1.0; */
	/* MinTeamp->min_temp -= 1.0;  menu   MaxFlow -> */
	/* MinFlow -> */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>  // https://github.com/marcoschwartz/LiquidCrystal_I2C

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateMenu(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t UP_BUTTON_PushButton_PIN_D11 = 11;
const uint8_t DOWN_BUTTON_PushButton_PIN_D12 = 12;
const uint8_t ENTER_BUTTON_PushButton_PIN_D10 = 10;

/****** DEFINITION OF VARIABLES *****/
float max_temp = 100.0;
float min_temp = 0.0;
float max_flow = 10.0;
float min_flow = 1.0;
int menu_index = 0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
LiquidCrystal_I2C lcd(0x27, 20, 4);  // set the LCD address to 0x27 for a 20 chars and 4 line display

void setup(void)
{
    // put your setup code here, to run once:

    pinMode(UP_BUTTON_PushButton_PIN_D11, INPUT_PULLUP);
    pinMode(DOWN_BUTTON_PushButton_PIN_D12, INPUT_PULLUP);
    pinMode(ENTER_BUTTON_PushButton_PIN_D10, INPUT_PULLUP);

    // Initialize the LCD
    lcd.init();
    lcd.backlight();

    // Print a message to the LCD
    lcd.setCursor(3, 0);
    lcd.print("Hello, world!");
    lcd.setCursor(2, 1);
    lcd.print("Ywrobot Arduino!");
    lcd.setCursor(0, 2);
    lcd.print("Arduino LCM IIC 2004");
    lcd.setCursor(2, 3);
    lcd.print("Power By Ec-yuan!");
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    updateMenu();
}

void updateMenu(void)
{
    if (digitalRead(UP_BUTTON_PushButton_PIN_D11) == LOW)
    {
        menu_index--;
        if (menu_index < 0) menu_index = 3;
        delay(200); // debounce delay
    }
    else if (digitalRead(DOWN_BUTTON_PushButton_PIN_D12) == LOW)
    {
        menu_index++;
        if (menu_index > 3) menu_index = 0;
        delay(200); // debounce delay
    }
    else if (digitalRead(ENTER_BUTTON_PushButton_PIN_D10) == LOW)
    {
        switch (menu_index)
        {
            case 0:
                max_temp -= 1.0;
                break;
            case 1:
                min_temp -= 1.0;
                break;
            case 2:
                max_flow -= 1.0;
                break;
            case 3:
                min_flow -= 1.0;
                break;
        }
        delay(200); // debounce delay
    }

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Menu:");
    lcd.setCursor(0, 1);
    lcd.print(menu_index == 0 ? "> MaxTemp" : "  MaxTemp");
    lcd.setCursor(0, 2);
    lcd.print(menu_index == 1 ? "> MinTemp" : "  MinTemp");
    lcd.setCursor(0, 3);
    lcd.print(menu_index == 2 ? "> MaxFlow" : "  MaxFlow");
    lcd.setCursor(0, 4);
    lcd.print(menu_index == 3 ? "> MinFlow" : "  MinFlow");
}

/* END CODE */