Arduino UNO R4 WiFi Bluetooth RTC Voorbeeld - Real-Time Clock Sync via BLE Tutorial
Overzicht
Het Bluetooth RTC voorbeeld biedt real-time kloksynchronisatie via de DIYables Bluetooth STEM app. Ontworpen voor Arduino UNO R4 WiFi die BLE (Bluetooth Low Energy) gebruikt om de ingebouwde hardware RTC van het board te synchroniseren met de klok van uw smartphone en de tijd weer te geven. De Arduino UNO R4 WiFi heeft een ingebouwde RTC module, waardoor het ideaal is voor tijdhouding projecten zonder externe RTC hardware nodig te hebben. Perfect voor klokken, data logging met timestamps, geplande automatisering en tijdgebaseerde projecten.
Opmerking: De Arduino UNO R4 WiFi ondersteunt alleen BLE (Bluetooth Low Energy). Het ondersteunt geen Classic Bluetooth. De DIYables Bluetooth App ondersteunt zowel BLE als Classic Bluetooth op Android, en BLE op iOS. Aangezien dit board BLE gebruikt, werkt de app op zowel Android als iOS.
Functies
- Ingebouwde Hardware RTC: Gebruikt Arduino UNO R4 WiFi's onboard RTC — geen externe module nodig
- Telefoon Tijdsync: Synchroniseer tijd van smartphone via Unix timestamp of lokale tijdcomponenten
- Real-Time Weergave: Toon huidige tijd op de app, elke seconde bijgewerkt
- Tijdaanvraag: App kan huidige tijd van het board opvragen
- Persistente Tijdhouding: RTC houdt tijd bij terwijl board gevoed wordt
- Werkt op Android & iOS: BLE wordt ondersteund op beide platforms
- Geen Koppeling Vereist: BLE verbindt automatisch zonder handmatige koppeling
Hardware Vereist
Of u kunt de volgende kits kopen:
| 1 | × | DIYables STEM V4 IoT Starterskit (Arduino inbegrepen) | |
| 1 | × | DIYables STEM V4B IoT Starterskit (Arduino inbegrepen) | |
| 1 | × | DIYables Sensorkit (18 sensoren/displays) |
Openbaarmaking: Sommige van de links in deze sectie zijn Amazon-affiliate links. We kunnen een commissie ontvangen voor aankopen die via deze links worden gedaan, zonder extra kosten voor u. We waarderen uw steun.
Opmerking: Geen externe RTC module is nodig! De Arduino UNO R4 WiFi heeft een ingebouwde hardware RTC toegankelijk via de RTC.h bibliotheek.
Arduino UNO R4 WiFi Code
Snelle Stappen
Volg deze instructies stap voor stap:
- Als dit uw eerste keer is met de Arduino UNO R4 WiFi, raadpleeg de Arduino UNO R4 WiFi aan de slag gids.
- Verbind het Arduino UNO R4 WiFi board met uw computer via een USB-kabel.
- Start de Arduino IDE op uw computer.
- Selecteer Arduino UNO R4 WiFi board en de juiste COM-poort.
- Navigeer naar het Libraries icoon in de linkerbalk van de Arduino IDE.
- Zoek "DIYables Bluetooth", vind vervolgens de DIYables Bluetooth bibliotheek van DIYables
- Klik op de Install knop om de bibliotheek te installeren.
- U wordt gevraagd om enkele andere bibliotheekafhankelijkheden te installeren
- Klik op de Install All knop om alle bibliotheekafhankelijkheden te installeren.
BLE Code
- In Arduino IDE, ga naar File Examples DIYables Bluetooth ArduinoBLE_RTC voorbeeld, of kopieer de bovenstaande code en plak het in de editor van Arduino IDE
/*
* DIYables Bluetooth Library - Bluetooth RTC Example
* Works with DIYables Bluetooth STEM app on Android and iOS
*
* This example demonstrates the Bluetooth RTC (Real-Time Clock) feature:
* - Real-time clock display for both Arduino and mobile app
* - One-click time synchronization from mobile app to Arduino
* - Hardware RTC integration for persistent timekeeping
* - Visual time difference monitoring
*
* Compatible Boards:
* - Arduino UNO R4 WiFi (with built-in RTC)
* Note: This example requires a board with hardware RTC.
* Other BLE boards can be used with an external RTC module (e.g., DS3231).
*
* Setup:
* 1. Upload the sketch to your Arduino
* 2. Open Serial Monitor to see connection status
* 3. Use DIYables Bluetooth App to connect and sync time
*
* Tutorial: https://diyables.io/bluetooth-app
* Author: DIYables
*/
#include <DIYables_BluetoothServer.h>
#include <DIYables_BluetoothRTC.h>
#include <platforms/DIYables_ArduinoBLE.h>
#include "RTC.h"
// BLE Configuration
const char* DEVICE_NAME = "Arduino_RTC";
const char* SERVICE_UUID = "19B10000-E8F2-537E-4F6C-D104768A1214";
const char* TX_UUID = "19B10001-E8F2-537E-4F6C-D104768A1214";
const char* RX_UUID = "19B10002-E8F2-537E-4F6C-D104768A1214";
// Create Bluetooth instances
DIYables_ArduinoBLE bluetooth(DEVICE_NAME, SERVICE_UUID, TX_UUID, RX_UUID);
DIYables_BluetoothServer bluetoothServer(bluetooth);
// Create RTC app instance
DIYables_BluetoothRTC bluetoothRTC;
void setup() {
Serial.begin(9600);
delay(1000);
Serial.println("DIYables Bluetooth - RTC Example");
// Initialize RTC
RTC.begin();
// Check if RTC is running and set initial time if needed
RTCTime savedTime;
RTC.getTime(savedTime);
if (!RTC.isRunning() || savedTime.getYear() == 2000) {
Serial.println("RTC is NOT running, setting initial time...");
// Set a default time - you can modify this to match current time
RTCTime startTime(28, Month::AUGUST, 2025, 12, 0, 0, DayOfWeek::THURSDAY, SaveLight::SAVING_TIME_ACTIVE);
RTC.setTime(startTime);
Serial.println("RTC initialized with default time");
} else {
Serial.println("RTC is already running");
}
// Print initial RTC time
RTCTime initialTime;
RTC.getTime(initialTime);
Serial.print("Initial RTC Time: ");
Serial.print(initialTime.getYear());
Serial.print("/");
Serial.print(Month2int(initialTime.getMonth()));
Serial.print("/");
Serial.print(initialTime.getDayOfMonth());
Serial.print(" - ");
if (initialTime.getHour() < 10) Serial.print("0");
Serial.print(initialTime.getHour());
Serial.print(":");
if (initialTime.getMinutes() < 10) Serial.print("0");
Serial.print(initialTime.getMinutes());
Serial.print(":");
if (initialTime.getSeconds() < 10) Serial.print("0");
Serial.print(initialTime.getSeconds());
Serial.println();
// Initialize Bluetooth server with platform-specific implementation
bluetoothServer.begin();
// Add RTC app to server
bluetoothServer.addApp(&bluetoothRTC);
// Set up connection event callbacks
bluetoothServer.setOnConnected([]() {
Serial.println("Bluetooth connected!");
// Send current time to app on connection
sendCurrentTimeToApp();
});
bluetoothServer.setOnDisconnected([]() {
Serial.println("Bluetooth disconnected!");
});
// Set callback for time sync from mobile app (Unix timestamp)
bluetoothRTC.onTimeSync(onTimeSyncReceived);
// Set callback for local time sync from mobile app (date/time components)
bluetoothRTC.onLocalTimeSync(onLocalTimeSyncReceived);
// Set callback for time request from mobile app
bluetoothRTC.onTimeRequest(onTimeRequested);
Serial.println("Waiting for Bluetooth connection...");
Serial.println("Connect via app to sync time");
}
void loop() {
// Handle Bluetooth server communications
bluetoothServer.loop();
// Send current time to mobile app and print to Serial every 1 second
static unsigned long lastUpdate = 0;
if (millis() - lastUpdate >= 1000) {
lastUpdate = millis();
// Get current RTC time
RTCTime currentTime;
RTC.getTime(currentTime);
// Send time to mobile app in human readable format
bluetoothRTC.sendTime(currentTime.getYear(), Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(), currentTime.getHour(),
currentTime.getMinutes(), currentTime.getSeconds());
// Print time to Serial Monitor
Serial.print("RTC Time: ");
Serial.print(currentTime.getYear());
Serial.print("/");
Serial.print(Month2int(currentTime.getMonth()));
Serial.print("/");
Serial.print(currentTime.getDayOfMonth());
Serial.print(" - ");
if (currentTime.getHour() < 10) Serial.print("0");
Serial.print(currentTime.getHour());
Serial.print(":");
if (currentTime.getMinutes() < 10) Serial.print("0");
Serial.print(currentTime.getMinutes());
Serial.print(":");
if (currentTime.getSeconds() < 10) Serial.print("0");
Serial.print(currentTime.getSeconds());
Serial.println();
}
delay(10);
}
// Callback function called when mobile app sends time sync command
void onTimeSyncReceived(unsigned long unixTimestamp) {
Serial.print("Time sync received (Unix): ");
Serial.println(unixTimestamp);
// Convert Unix timestamp to RTCTime
RTCTime newTime;
newTime.setUnixTime(unixTimestamp);
// Set RTC time
RTC.setTime(newTime);
Serial.println("Arduino RTC synchronized from Unix timestamp!");
}
// Callback function called when mobile app sends local time sync with components
void onLocalTimeSyncReceived(int year, int month, int day, int hour, int minute, int second) {
Serial.print("Local time sync received: ");
Serial.print(year);
Serial.print("/");
Serial.print(month);
Serial.print("/");
Serial.print(day);
Serial.print(" ");
Serial.print(hour);
Serial.print(":");
Serial.print(minute);
Serial.print(":");
Serial.println(second);
// Create RTCTime from components (local time)
// Convert month integer to Month enum
Month monthEnum;
switch(month) {
case 1: monthEnum = Month::JANUARY; break;
case 2: monthEnum = Month::FEBRUARY; break;
case 3: monthEnum = Month::MARCH; break;
case 4: monthEnum = Month::APRIL; break;
case 5: monthEnum = Month::MAY; break;
case 6: monthEnum = Month::JUNE; break;
case 7: monthEnum = Month::JULY; break;
case 8: monthEnum = Month::AUGUST; break;
case 9: monthEnum = Month::SEPTEMBER; break;
case 10: monthEnum = Month::OCTOBER; break;
case 11: monthEnum = Month::NOVEMBER; break;
case 12: monthEnum = Month::DECEMBER; break;
default: monthEnum = Month::JANUARY; break;
}
RTCTime newTime(day, monthEnum, year, hour, minute, second, DayOfWeek::MONDAY, SaveLight::SAVING_TIME_ACTIVE);
// Set RTC time
RTC.setTime(newTime);
Serial.println("Arduino RTC synchronized from local time components!");
}
// Callback function called when mobile app requests current Arduino time
void onTimeRequested() {
Serial.println("Time requested by app");
sendCurrentTimeToApp();
}
// Helper function to send current time to mobile app
void sendCurrentTimeToApp() {
// Get current RTC time and send to app in human readable format
RTCTime currentTime;
RTC.getTime(currentTime);
bluetoothRTC.sendTime(currentTime.getYear(), Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(), currentTime.getHour(),
currentTime.getMinutes(), currentTime.getSeconds());
}
- Klik op de Upload knop in Arduino IDE om code naar Arduino UNO R4 WiFi te uploaden
- Open de Serial Monitor
- Bekijk het resultaat in de Serial Monitor. Het ziet er als volgt uit:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno R4 WiFi' on 'COM15')
New Line
9600 baud
DIYables Bluetooth - RTC Example
Waiting for Bluetooth connection...
RTC not running or year is 2000, waiting for time sync...
Mobiele App
Opmerking: De DIYables Bluetooth App ondersteunt zowel BLE als Classic Bluetooth op Android, en BLE op iOS. Aangezien de Arduino UNO R4 WiFi BLE gebruikt, werkt de app op zowel Android als iOS. Handmatige koppeling is niet nodig voor BLE — gewoon scannen en verbinden.
- Open de DIYables Bluetooth App
- Bij het eerste gebruik van de app vraagt het om machtigingen. Verleen de volgende:
- Nearby Devices machtiging (Android 12+) / Bluetooth machtiging (iOS) - vereist om Bluetooth apparaten te scannen en verbinden
- Location machtiging (alleen Android 11 en lager) - vereist door oudere Android versies om BLE apparaten te scannen
- Zorg ervoor dat Bluetooth is ingeschakeld op uw telefoon
- Tik op het beginscherm op de Connect knop. De app zal scannen naar BLE apparaten.
- Vind en tik op "Arduino_RTC" in de scanresultaten om te verbinden.
- Eenmaal verbonden, gaat de app automatisch terug naar het beginscherm. Selecteer de RTC app uit het app-menu.
Opmerking: U kunt op het instellingen icoon op het beginscherm tikken om apps te verbergen/tonen op het beginscherm. Voor meer details, zie de DIYables Bluetooth App Gebruikershandleiding.
- De app zal de huidige tijd van de Arduino's RTC weergeven
- Gebruik de Sync knop om de tijd van de telefoon naar de Arduino te synchroniseren
- De tijd wordt elke seconde bijgewerkt
Kijk nu terug naar de Serial Monitor in Arduino IDE. U zult zien:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno R4 WiFi' on 'COM15')
New Line
9600 baud
Bluetooth connected!
Time sync received (unix): 1719849600
RTC set to: 2025/07/01 12:00:00
Current time: 2025/07/01 12:00:01
Current time: 2025/07/01 12:00:02
Creatieve Aanpassing - Pas de Code aan voor Uw Project
Tijdsync Methoden
De app kan tijd naar de Arduino synchroniseren met twee methoden:
// Methode 1: Unix timestamp sync
bluetoothRTC.onTimeSync([](unsigned long unixTime) {
// Converteer Unix timestamp en stel RTC in
Serial.print("Unix time: ");
Serial.println(unixTime);
});
// Methode 2: Lokale tijdcomponenten sync
bluetoothRTC.onLocalTimeSync([](int year, int month, int day, int hour, int minute, int second) {
// Stel RTC direct in met componenten
Serial.print("Local time: ");
Serial.print(year);
Serial.print("/");
Serial.print(month);
Serial.print("/");
Serial.println(day);
});
Tijd Verzenden naar App
// Verstuur huidige tijd naar de app
bluetoothRTC.sendTime(year, month, day, hour, minute, second);
Tijdaanvragen Behandelen
bluetoothRTC.onTimeRequest([]() {
// App vraagt om de huidige tijd
// Lees RTC en verstuur tijd terug
RTCTime currentTime;
RTC.getTime(currentTime);
bluetoothRTC.sendTime(
currentTime.getYear(),
Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(),
currentTime.getHour(),
currentTime.getMinutes(),
currentTime.getSeconds()
);
});
Gebruik van de Ingebouwde RTC
De ingebouwde RTC van de Arduino UNO R4 WiFi wordt benaderd via de RTC.h bibliotheek:
#include "RTC.h"
void setup() {
RTC.begin(); // Initialiseer de hardware RTC
}
// Stel tijd in op de RTC
RTCTime timeToSet;
timeToSet.setYear(2025);
timeToSet.setMonth(Month::JULY);
timeToSet.setDayOfMonth(1);
timeToSet.setHour(12);
timeToSet.setMinute(0);
timeToSet.setSecond(0);
RTC.setTime(timeToSet);
// Lees tijd van de RTC
RTCTime currentTime;
RTC.getTime(currentTime);
int year = currentTime.getYear();
int month = Month2int(currentTime.getMonth());
int day = currentTime.getDayOfMonth();
int hour = currentTime.getHour();
int minute = currentTime.getMinutes();
int second = currentTime.getSeconds();
Programmeervoorbeelden
Klok met Serial Weergave
void loop() {
bluetoothServer.loop();
static unsigned long lastTime = 0;
if (millis() - lastTime >= 1000) {
lastTime = millis();
RTCTime currentTime;
if (RTC.getTime(currentTime)) {
char timeStr[20];
sprintf(timeStr, "%04d/%02d/%02d %02d:%02d:%02d",
currentTime.getYear(),
Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(),
currentTime.getHour(),
currentTime.getMinutes(),
currentTime.getSeconds());
Serial.println(timeStr);
// Verstuur ook naar de app
bluetoothRTC.sendTime(
currentTime.getYear(),
Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(),
currentTime.getHour(),
currentTime.getMinutes(),
currentTime.getSeconds()
);
}
}
}
Data Logger met Timestamps
void logSensorData() {
RTCTime currentTime;
RTC.getTime(currentTime);
float temperature = readSensor();
char logEntry[50];
sprintf(logEntry, "%04d/%02d/%02d %02d:%02d:%02d - Temp: %.1f°C",
currentTime.getYear(),
Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(),
currentTime.getHour(),
currentTime.getMinutes(),
currentTime.getSeconds(),
temperature);
Serial.println(logEntry);
}
Videohandleiding
De onderstaande videodemo gebruikt de onderstaande code:
/*
* Deze Arduino UNO R4 code is ontwikkeld door newbiely.nl
* Deze Arduino UNO R4 code wordt zonder enige beperking aan het publiek beschikbaar gesteld.
* Voor volledige instructies en schema's, bezoek:
* https://newbiely.nl/tutorials/arduino-uno-r4/arduino-uno-r4-diyables-bluetooth-app-rtc
*/
/*
* DIYables Bluetooth Library - Bluetooth RTC Example
* Works with DIYables Bluetooth STEM app on Android and iOS
*
* This example demonstrates the Bluetooth RTC (Real-Time Clock) feature:
* - Real-time clock display for both Arduino and mobile app
* - One-click time synchronization from mobile app to Arduino
* - Hardware RTC integration for persistent timekeeping
* - Visual time difference monitoring
*
* Compatible Boards:
* - Arduino UNO R4 WiFi (with built-in RTC)
* Note: This example requires a board with hardware RTC.
* Other BLE boards can be used with an external RTC module (e.g., DS3231).
*
* Setup:
* 1. Upload the sketch to your Arduino
* 2. Open Serial Monitor to see connection status
* 3. Use DIYables Bluetooth App to connect and sync time
*
* Tutorial: https://diyables.io/bluetooth-app
* Author: DIYables
*/
#include <DIYables_BluetoothServer.h>
#include <DIYables_BluetoothRTC.h>
#include <platforms/DIYables_ArduinoBLE.h>
#include "RTC.h"
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
// BLE Configuration
const char* DEVICE_NAME = "Arduino_RTC";
const char* SERVICE_UUID = "19B10000-E8F2-537E-4F6C-D104768A1214";
const char* TX_UUID = "19B10001-E8F2-537E-4F6C-D104768A1214";
const char* RX_UUID = "19B10002-E8F2-537E-4F6C-D104768A1214";
// Create Bluetooth instances
DIYables_ArduinoBLE bluetooth(DEVICE_NAME, SERVICE_UUID, TX_UUID, RX_UUID);
DIYables_BluetoothServer bluetoothServer(bluetooth);
// Create RTC app instance
DIYables_BluetoothRTC bluetoothRTC;
// --- DISPLAY SUBSYSTEM CONFIGURATION ---
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW // Hardware register layout variant for physical modules
#define MAX_DEVICES 4 // Number of cascaded 8x8 matrix blocks
#define CS_PIN 9 // SPI Chip Select active-low hardware pin
MD_Parola ledMatrix = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// --- ALARM SUBSYSTEM ARCHITECTURE ---
const int BUZZER_PIN = 8;
bool isAlarming = false; // State flag to prevent redundant re-initialization of display buffers
struct AlarmTime {
int hour;
int minute;
};
// Scheduled alarm matrices for daily medication dispatch
const int TOTAL_ALARMS = 3;
AlarmTime medicationAlarms[TOTAL_ALARMS] = {
{12, 53}, // Slot 1: Morning Dose
{12, 54}, // Slot 2: Noon Dose
{12, 55} // Slot 3: Evening Dose
};
// Fixed-size static allocation to prevent dangling pointers during stack deallocation
char AlertMsg[50] = "";
void setup() {
Serial.begin(9600);
delay(1000);
// Configure GPIO peripherals
pinMode(BUZZER_PIN, OUTPUT);
digitalWrite(BUZZER_PIN, LOW);
// Initialize SPI-driven LED Matrix
ledMatrix.begin();
ledMatrix.setIntensity(3); // Brightness optimization register value to prevent camera sensor overexposure
ledMatrix.displayClear();
// Set initial boot token into display queue
ledMatrix.displayText("Medicine Reminder System READY", PA_LEFT, 60, 2000, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
Serial.println("DIYables Bluetooth - RTC Example");
// Initialize RTC
RTC.begin();
// Check if RTC is running and set initial time if needed
RTCTime savedTime;
RTC.getTime(savedTime);
if (!RTC.isRunning() || savedTime.getYear() == 2000) {
Serial.println("RTC is NOT running, setting initial time...");
// Set a default time - you can modify this to match current time
RTCTime startTime(25, Month::MAY, 2026, 8, 13, 0, DayOfWeek::THURSDAY, SaveLight::SAVING_TIME_ACTIVE);
RTC.setTime(startTime);
Serial.println("RTC initialized with default time");
} else {
Serial.println("RTC is already running");
}
// Print initial RTC time
RTCTime initialTime;
RTC.getTime(initialTime);
Serial.print("Initial RTC Time: ");
Serial.print(initialTime.getYear());
Serial.print("/");
Serial.print(Month2int(initialTime.getMonth()));
Serial.print("/");
Serial.print(initialTime.getDayOfMonth());
Serial.print(" - ");
if (initialTime.getHour() < 10) Serial.print("0");
Serial.print(initialTime.getHour());
Serial.print(":");
if (initialTime.getMinutes() < 10) Serial.print("0");
Serial.print(initialTime.getMinutes());
Serial.print(":");
if (initialTime.getSeconds() < 10) Serial.print("0");
Serial.print(initialTime.getSeconds());
Serial.println();
// Initialize Bluetooth server with platform-specific implementation
bluetoothServer.begin();
// Add RTC app to server
bluetoothServer.addApp(&bluetoothRTC);
// Set up connection event callbacks
bluetoothServer.setOnConnected([]() {
Serial.println("Bluetooth connected!");
// Send current time to app on connection
sendCurrentTimeToApp();
});
bluetoothServer.setOnDisconnected([]() {
Serial.println("Bluetooth disconnected!");
});
// Set callback for time sync from mobile app (Unix timestamp)
bluetoothRTC.onTimeSync(onTimeSyncReceived);
// Set callback for local time sync from mobile app (date/time components)
bluetoothRTC.onLocalTimeSync(onLocalTimeSyncReceived);
// Set callback for time request from mobile app
bluetoothRTC.onTimeRequest(onTimeRequested);
Serial.println("Waiting for Bluetooth connection...");
Serial.println("Connect via app to sync time");
}
void loop() {
// Handle Bluetooth server communications
bluetoothServer.loop();
// Non-blocking shift engine: Calculates next step pixel translations on every pass
if (ledMatrix.displayAnimate()) {
ledMatrix.displayReset();
}
// Send current time to mobile app and print to Serial every 1 second
static unsigned long lastUpdate = 0;
if (millis() - lastUpdate >= 1000) {
lastUpdate = millis();
// Get current RTC time
RTCTime currentTime;
RTC.getTime(currentTime);
int currentH = currentTime.getHour();
int currentM = currentTime.getMinutes();
int currentS = currentTime.getSeconds();
// Send time to mobile app in human readable format
bluetoothRTC.sendTime(currentTime.getYear(), Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(), currentTime.getHour(),
currentTime.getMinutes(), currentTime.getSeconds());
// Print time to Serial Monitor
Serial.print("RTC Time: ");
Serial.print(currentTime.getYear());
Serial.print("/");
Serial.print(Month2int(currentTime.getMonth()));
Serial.print("/");
Serial.print(currentTime.getDayOfMonth());
Serial.print(" - ");
if (currentTime.getHour() < 10) Serial.print("0");
Serial.print(currentTime.getHour());
Serial.print(":");
if (currentTime.getMinutes() < 10) Serial.print("0");
Serial.print(currentTime.getMinutes());
Serial.print(":");
if (currentTime.getSeconds() < 10) Serial.print("0");
Serial.print(currentTime.getSeconds());
Serial.println();
// Sequential search scan across active alarm vectors
for (int i = 0; i < TOTAL_ALARMS; i++) {
if (currentH == medicationAlarms[i].hour &&
currentM == medicationAlarms[i].minute &&
currentS == 0) {
// Conditional gate to prevent continuous buffer overwrites within the same second
if (!isAlarming) {
isAlarming = true;
// Low-level buffer formatting to map runtime integers into locked memory space
// %02d pads leading zeros to preserve fixed structural layout formatting [HH:MM]
sprintf(AlertMsg, "TAKE MEDICATION ! [%02d:%02d] ", currentH, currentM);
ledMatrix.displayClear();
// Link the safe static memory pointer directly into the display rendering core
ledMatrix.displayText(AlertMsg, PA_LEFT, 60, 0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
Serial.print("[ALARM] Array index match detected at slot ID: ");
Serial.println(i + 1);
}
}
}
// Auto-timeout block: Clears state metrics after 30 elapsed duty seconds
if (currentS >= 20 && isAlarming) {
isAlarming = false;
ledMatrix.displayClear();
ledMatrix.displayText("Medicine Reminder System With APP RTC", PA_LEFT, 60, 0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
Serial.println("[ALARM] Trigger window expired. Display registers reset to default state.");
}
}
// Asynchronous Active Buzzer Duty Cycle Control (50% duty cycle, 1Hz rate square-wave generator)
if (isAlarming) {
static unsigned long lastBuzzerToggle = 0;
if (millis() - lastBuzzerToggle >= 500) {
lastBuzzerToggle = millis();
digitalWrite(BUZZER_PIN, !digitalRead(BUZZER_PIN)); // Invert state logic
}
} else {
digitalWrite(BUZZER_PIN, LOW); // Enforce noise suppression when system state is idle
}
delay(10);
}
// Callback function called when mobile app sends time sync command
void onTimeSyncReceived(unsigned long unixTimestamp) {
Serial.print("Time sync received (Unix): ");
Serial.println(unixTimestamp);
// Convert Unix timestamp to RTCTime
RTCTime newTime;
newTime.setUnixTime(unixTimestamp);
// Set RTC time
RTC.setTime(newTime);
Serial.println("Arduino RTC synchronized from Unix timestamp!");
}
// Callback function called when mobile app sends local time sync with components
void onLocalTimeSyncReceived(int year, int month, int day, int hour, int minute, int second) {
Serial.print("Local time sync received: ");
Serial.print(year);
Serial.print("/");
Serial.print(month);
Serial.print("/");
Serial.print(day);
Serial.print(" ");
Serial.print(hour);
Serial.print(":");
Serial.print(minute);
Serial.print(":");
Serial.println(second);
// Create RTCTime from components (local time)
// Convert month integer to Month enum
Month monthEnum;
switch(month) {
case 1: monthEnum = Month::JANUARY; break;
case 2: monthEnum = Month::FEBRUARY; break;
case 3: monthEnum = Month::MARCH; break;
case 4: monthEnum = Month::APRIL; break;
case 5: monthEnum = Month::MAY; break;
case 6: monthEnum = Month::JUNE; break;
case 7: monthEnum = Month::JULY; break;
case 8: monthEnum = Month::AUGUST; break;
case 9: monthEnum = Month::SEPTEMBER; break;
case 10: monthEnum = Month::OCTOBER; break;
case 11: monthEnum = Month::NOVEMBER; break;
case 12: monthEnum = Month::DECEMBER; break;
default: monthEnum = Month::JANUARY; break;
}
RTCTime newTime(day, monthEnum, year, hour, minute, second, DayOfWeek::MONDAY, SaveLight::SAVING_TIME_ACTIVE);
// Set RTC time
RTC.setTime(newTime);
Serial.println("Arduino RTC synchronized from local time components!");
}
// Callback function called when mobile app requests current Arduino time
void onTimeRequested() {
Serial.println("Time requested by app");
sendCurrentTimeToApp();
}
// Helper function to send current time to mobile app
void sendCurrentTimeToApp() {
// Get current RTC time and send to app in human readable format
RTCTime currentTime;
RTC.getTime(currentTime);
bluetoothRTC.sendTime(currentTime.getYear(), Month2int(currentTime.getMonth()),
currentTime.getDayOfMonth(), currentTime.getHour(),
currentTime.getMinutes(), currentTime.getSeconds());
}
Probleemoplossing
Veelvoorkomende Problemen
1. Kan het apparaat niet vinden in de app
- Zorg ervoor dat de Arduino UNO R4 WiFi is ingeschakeld en de sketch is geüpload
- Controleer of Bluetooth op uw telefoon is ingeschakeld
- Op Android 11 en lager, schakel ook Locatiediensten in
2. Tijd toont 2000/01/01 of incorrecte tijd
- De RTC moet minstens eenmaal gesynchroniseerd worden na opstarten
- Gebruik de Sync knop in de app om de tijd in te stellen
- De RTC verliest tijd wanneer het board wordt uitgeschakeld (geen batterijback-up)
3. Tijd synchroniseert niet vanuit app
- Controleer of de onTimeSync en onLocalTimeSync callbacks zijn ingesteld
- Bekijk de Serial Monitor voor sync berichten
- Zorg ervoor dat de BLE verbinding stabiel is
4. RTC drift over tijd
- De ingebouwde RTC kristal heeft beperkte nauwkeurigheid
- Synchroniseer periodiek opnieuw via de app
- Voor kritische timing, overweeg ook NTP over WiFi te gebruiken
5. Maand conversie problemen
- De Arduino UNO R4 WiFi RTC gebruikt een Month enum, niet integer
- Gebruik een conversiefunctie (zoals Month2int() in het voorbeeld) voor integer maanden
- Maanden zijn 1-gebaseerd (januari = 1)
6. Upload mislukt of board niet herkend
- Installeer het nieuwste Arduino UNO R4 board pakket via Board Manager
- Probeer een andere USB-kabel of poort
Projectideeën
- Digitale klok met BLE tijdsync
- Data logger met nauwkeurige timestamps
- Geplande taakautomatisering (aan/uit op specifieke tijden)
- Wekker met smartphone besturing
- Tijd-gestempelde gebeurtenisrecorder
Volgende Stappen
Na het beheersen van het Bluetooth RTC voorbeeld, probeer:
- Bluetooth Monitor - Voor tekst-gebaseerde status weergave met timestamps
- Bluetooth Table - Voor gestructureerde data met tijdvelden
- Bluetooth Chat - Voor tweezijdige communicatie
- Meerdere Bluetooth Apps - RTC combineren met andere apps
Ondersteuning
Voor aanvullende hulp:
- Bekijk de API Reference documentatie
- Bezoek DIYables tutorials
- Arduino community forums
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