HMI Display CrowPanel 5.79 Inch MQTT

// main.cpp
#include <WiFi.h>
#include <PubSubClient.h>
#include "display.h"
#include "mqtt.h"
#include "buttons.h"
#include "EPD_Init.h"

void setup() {
    Serial.begin(115200);
    EPD_Init(); // Ensure e-paper display initializes properly
    setupDisplay();
    setupWiFi();
    setupMQTT();
    setupButtons();
    displayMenu();
}

void loop() {
    handleMQTT();
    handleButtons();
    delay(100);
}

// display.h
#ifndef DISPLAY_H
#define DISPLAY_H
#include <GxEPD2_BW.h>
#include <Fonts/FreeMonoBold9pt7b.h>
#include "pic_scenario.h" // Include images/icons

void setupDisplay();
void displayMenu();
void displayData(int page);
void updateSelection(int direction);
void showSelectedPage();

#endif

// display.cpp
#include "display.h"
#define CS_PIN 5
#define DC_PIN 17
#define RST_PIN 16
#define BUSY_PIN 4
GxEPD2_BW<GxEPD2_270, GxEPD2_270::HEIGHT> display(GxEPD2_270(CS_PIN, DC_PIN, RST_PIN, BUSY_PIN));

int selectedOption = 0;

void setupDisplay() {
    display.init();
    EPD_Init();
}

void displayMenu() {
    display.setFullWindow();
    display.firstPage();
    do {
        display.fillScreen(GxEPD_WHITE);
        display.drawBitmap(10, 10, gImage_1, 50, 50, GxEPD_BLACK); // Display an icon
        display.setCursor(70, 30);
        display.print("Select Data:");
        display.setCursor(10, 70);
        display.print(selectedOption == 0 ? "-> Temp & Humidity" : "   Temp & Humidity");
        display.setCursor(10, 100);
        display.print(selectedOption == 1 ? "-> Power Usage" : "   Power Usage");
        display.setCursor(10, 130);
        display.print(selectedOption == 2 ? "-> Air Quality" : "   Air Quality");
        display.setCursor(10, 160);
        display.print(selectedOption == 3 ? "-> Water Level" : "   Water Level");
    } while (display.nextPage());
}

void updateSelection(int direction) {
    selectedOption = (selectedOption + direction + 4) % 4;
    displayMenu();
}

void showSelectedPage() {
    displayData(selectedOption);
}

void displayData(int page) {
    display.setFullWindow();
    display.firstPage();
    do {
        display.fillScreen(GxEPD_WHITE);
        display.setCursor(10, 30);
        if (page == 0) display.print("Temperature: " + data_store[0] + " C\nHumidity: " + data_store[1] + "%");
        else if (page == 1) display.print("Power Usage: " + data_store[2] + " W");
        else if (page == 2) display.print("PM2.5: " + data_store[3] + " ug/m3\nPurifier RPM: " + data_store[4]);
        else if (page == 3) display.print("Water Level: " + data_store[5] + "%");
    } while (display.nextPage());
    EPD_Update(); // Ensure display refresh
}

// buttons.h
#ifndef BUTTONS_H
#define BUTTONS_H
void setupButtons();
void handleButtons();
#endif

// buttons.cpp
#include "buttons.h"
#include "display.h"
#include <Arduino.h>
#define MENU_BUTTON 2
#define UP_BUTTON 4
#define DOWN_BUTTON 6
#define SELECT_BUTTON 5

void setupButtons() {
    pinMode(MENU_BUTTON, INPUT_PULLUP);
    pinMode(UP_BUTTON, INPUT_PULLUP);
    pinMode(DOWN_BUTTON, INPUT_PULLUP);
    pinMode(SELECT_BUTTON, INPUT_PULLUP);
}

void handleButtons() {
    if (digitalRead(UP_BUTTON) == LOW) {
        updateSelection(-1);
        delay(200);
    }
    if (digitalRead(DOWN_BUTTON) == LOW) {
        updateSelection(1);
        delay(200);
    }
    if (digitalRead(SELECT_BUTTON) == LOW) {
        showSelectedPage();
        delay(500);
    }
}