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Buzzer, also known as a piezo speaker, is a device that produces sound by converting an electrical signal into audio. It is commonly used to provide alarms, beeps, melodies, or user feedback, such as keypad click sounds or notification alerts.
Real Time Clock (RTC) stands for Real Time Clock, which provides accurate timekeeping over long periods because it has its own independent power source, typically a coin cell battery. This allows the clock to maintain the correct time even when the main system power is off. The Gorillacell ESP32 Development Kit comes with one RTC module driven by the DS3231 chip. The DS3231 is a high-accuracy I²C real-time clock that provides both date (year, month, and day) and time (hour, minute, and second) information.