My project usinng ds3231 rtc module, dht22 and lcd i2c. It use buzzer for an alarm (with a relay controll). I programmed a lcd menu, controlling by two buttons. To reset Arduino Uno click two buttons for 5 seconds. To enter for a menu you have to click one of two buttons.

How to connect?

lcd:
GND → GND
VCC → 5v
SDA → SDA
SCL → SCL

ds3231:
GND → GND
VCC → 5v
SDA → SDA
SCL → SCL

dht22:
+ → 3.3V
- → GND
OUT → GPIO 2

buzzer:
+ → NC (NORMALLY CLOSED)
- → GND
OUT → GPIO 12

RED BUTTON:
VCC → 5V
GND → GND
OUT → GPIO 8

YELLOW BUTTON:
VCC → 5V
GND → GND
OUT → GPIO 7

RELAY:

CONTROL CIRCULATION:

VCC → 3.3V
GND → GND
IN → GPIO 4

OUTPUT CIRCULATION:

COMMMON CONTACT → 5V
NORMALLY CLOSED → BUZZER'S +
NORMALLY OPEN - NOT CONNECTED