#define BUZZER_PIN 7
#define TM1637_DIO 4
#define TM1637_CLK 5
#define BUTTON_PIN 2
#define POT_PIN A7
#define BT_RX 8
#define BT_TX 9

LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS3231 rtc;
TM1637Display display(TM1637_CLK, TM1637_DIO);
SoftwareSerial btSerial(BT_RX, BT_TX);
RDA5807M radio;

volatile bool alarmTriggered = false;
int alarmHour = 8, alarmMinute = 0;
bool alarmActive = false;
unsigned long lastBeepTime = 0;
bool buzzerState = false;

void IRAM_ATTR handleButton() {
alarmActive = false;
digitalWrite(BUZZER_PIN, LOW);
cd.setCursor(0, 1);
lcd.print(“Alarma oprita! ”);
}

void setup() { pinMode(BUZZER_PIN, OUTPUT); inMode(BUTTON_PIN, INPUT_PULLUP);

attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), handleButton, FALLING);

Serial.begin(9600); btSerial.begin(9600);

Wire.begin(); lcd.init(); lcd.backlight(); rtc.begin(); display.setBrightness(0x0f); radio.init(); radio.setFrequency(10390);

lcd.setCursor(0, 0); lcd.print(“Ceas multi-lab!”); }

void loop() { DateTime now = rtc.now(); int hh = now.hour(); int mm = now.minute(); int ss = now.second();

int timeVal = hh * 100 + mm; display.showNumberDecEx(timeVal, 0b01000000, true);

if (Serial.available()) {

String cmd = Serial.readStringUntil('\n');
handleCommand(cmd);

} if (btSerial.available()) {

String cmd = btSerial.readStringUntil('\n');
handleCommand(cmd);

}

if (alarmActive) {

unsigned long t = millis();
if (t - lastBeepTime > 300) {
  buzzerState = !buzzerState;
  analogWrite(BUZZER_PIN, buzzerState ? 180 : 0);
  lastBeepTime = t;
}
lcd.setCursor(0, 1);
lcd.print("ALARMA!       ");

} else {

digitalWrite(BUZZER_PIN, LOW);

}

lcd.setCursor(0, 0); lcd.printf(”%02d:%02d:%02d T:%.1f ”, hh, mm, ss, temp);

if (!alarmActive && hh == alarmHour && mm == alarmMinute && ss == 0) {

alarmActive = true;

}

delay(50); }

void handleCommand(String cmd)
{ cmd.trim(); if (cmd.startsWith(“ALARM ”)) {

int sep = cmd.indexOf(':');  
if (sep > 0) {  
  alarmHour = cmd.substring(6, sep).toInt();  
  alarmMinute = cmd.substring(sep+1).toInt();  
  Serial.println("Setat alarma la " + String(alarmHour) + ":" + String(alarmMinute));  
  btSerial.println("Setat alarma la " + String(alarmHour) + ":" + String(alarmMinute));  
}  

} else if (cmd.startsWith(“RADIO ”)) {

float freq = cmd.substring(6).toFloat() / 100;  
radio.setFrequency(freq);  
Serial.println("Radio: " + String(freq, 2));  
btSerial.println("Radio: " + String(freq, 2));  

} }