An IMac-style iPhone charging stand powered by Arduino Uno R4 Wi-Fi
Devices and components
Arduino® UNO R4 Wi-Fi
Piezoelectric buzzer
IR sensors
Jumper wires (generic)
Software and tools
Arduino IDE
Project description
How the project works
Arduino Uno R4 Wi-Fi: Controls the system.
At bedtime, a buzzer (pin D11) starts to sound.
An IR sensor (D7 pin) checks if the phone is placed on the holder.
When the phone is detected:
Required Components
Arduino UNO R4 Wi-Fi
Buzzer
Infrared sensor module
Connecting wires
Circuit connections
Buzzer at D11
IR sensor output to pin D7
IR sensor VCC to 5V
IR sensor GND to GND
Arduino code
#include "RTC.h" // Arduino UNO R4 RTC library
const int buzzerPin = 11;
const int sensorPin = 7; // Change to your actual sensor pin
void setup() {
Serial.begin(115200);
while (!Serial); // Wait for serial
pinMode(buzzerPin, OUTPUT);
pinMode(sensorPin, INPUT);
if (!RTC.begin()) {
Serial.println("Couldn't find RTC");
while (1);
}
// Set initial RTC time: 16 August 2025, 09:26:00 Friday
RTCTime myTime(
16, Month::AUGUST, 2025, // Day, Month, Year
9, 26, 0, // Hour, Minute, Second
DayOfWeek::FRIDAY, // Day of the week
SaveLight::SAVING_TIME_INACTIVE // No daylight saving
);
RTC.setTime(myTime);
Serial.println("RTC time set to 16 Aug 2025, 09:26:00");
}
void loop() {
RTCTime currentTime;
RTC.getTime(currentTime);
int hour = currentTime.getHour();
int minute = currentTime.getMinutes();
int second = currentTime.getSeconds();
// Print current time
Serial.print(currentTime.getYear());
Serial.print("-");
Serial.print((int)currentTime.getMonth());
Serial.print("-");
Serial.print(currentTime.getDayOfMonth());
Serial.print(" ");
Serial.print(hour);
Serial.print(":");
Serial.print(minute);
Serial.print(":");
Serial.println(second);
// Check if it's 9:30
if (hour == 9 && minute == 30) {
int sensorState = digitalRead(sensorPin);
if (sensorState == LOW) {
// Stop buzzer if sensor is LOW
digitalWrite(buzzerPin, LOW);
} else {
// Beep continuously if sensor is HIGH
digitalWrite(buzzerPin, HIGH);
delay(200); // ON for 200ms
digitalWrite(buzzerPin, LOW);
delay(200); // OFF for 200ms
return; // Exit loop early to keep beeping
}
} else {
// Make sure buzzer is off at other times
digitalWrite(buzzerPin, LOW);
}
delay(1000);
}
The IMac-style charging stand
Final project in action
https://youtube.com/shorts/juen5rXewZQ?si=O18Ubt_5zFog-Lh0
When it's time to go to bed, the bell starts to ring.
I place my iPhone on the support.
IR sensor detects phone
The buzzer stops
The phone starts charging.
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Conclusion
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}
Note: Content and images are from: https://projecthub.arduino.cc/, with some modifications.
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