DIY IPhone Stand with Sleep Reminder Using Arduino UNO R4 Wi-Fi

1#include "RTC.h"  // Arduino UNO R4 RTC library 
2const int buzzerPin = 11; 
3const int sensorPin = 7; // Change to your actual sensor pin 
4void setup() { 
5	 Serial.begin(115200); 
6	 while (!Serial); // Wait for serial 
7	 pinMode(buzzerPin, OUTPUT); 
8	 pinMode(sensorPin, INPUT); 
9	 if (!RTC.begin()) { 
10	   Serial.println("Couldn't find RTC"); 
11	   while (1); 
12	 } 
13	 // Set initial RTC time: 16 August 2025, 09:26:00 Friday 
14	 RTCTime myTime( 
15	   16, Month::AUGUST, 2025,  // Day, Month, Year 
16	   9, 26, 0,                 // Hour, Minute, Second 
17	   DayOfWeek::FRIDAY,        // Day of the week 
18	   SaveLight::SAVING_TIME_INACTIVE // No daylight saving 
19	 ); 
20	 RTC.setTime(myTime); 
21	 Serial.println("RTC time set to 16 Aug 2025, 09:26:00"); 
22} 
23void loop() { 
24	 RTCTime currentTime; 
25	 RTC.getTime(currentTime); 
26	 int hour = currentTime.getHour(); 
27	 int minute = currentTime.getMinutes(); 
28	 int second = currentTime.getSeconds(); 
29	 // Print current time 
30	 Serial.print(currentTime.getYear()); 
31	 Serial.print("-"); 
32	 Serial.print((int)currentTime.getMonth()); 
33	 Serial.print("-"); 
34	 Serial.print(currentTime.getDayOfMonth()); 
35	 Serial.print(" "); 
36	 Serial.print(hour); 
37	 Serial.print(":"); 
38	 Serial.print(minute); 
39	 Serial.print(":"); 
40	 Serial.println(second); 
41	 // Check if it's 9:30 
42	 if (hour == 9 && minute == 30) { 
43	   int sensorState = digitalRead(sensorPin); 
44	   if (sensorState == LOW) { 
45	     // Stop buzzer if sensor is LOW 
46	     digitalWrite(buzzerPin, LOW); 
47	   } else { 
48	     // Beep continuously if sensor is HIGH 
49	     digitalWrite(buzzerPin, HIGH); 
50	     delay(200);              // ON for 200ms 
51	     digitalWrite(buzzerPin, LOW); 
52	     delay(200);              // OFF for 200ms 
53	     return; // Exit loop early to keep beeping 
54	   } 
55	 } else { 
56	   // Make sure buzzer is off at other times 
57	   digitalWrite(buzzerPin, LOW); 
58	 } 
59	 delay(1000); 
60}