RTC Alarm Clock Wiring Component Pin LCD SDA A4 LCD SCL A5 LCD VCC 5V LCD GND GND RTC SDA A4 RTC SCL A5 RTC VCC 5V RTC GND GND Passive buzzer + D8 Passive buzzer - GND Button HOUR+ D2 Button HOUR- D3 Button MIN+ D4 Button MIN- D5 Button STOP D6 Libraries marcoschwartz/LiquidCrystal_I2C@^1.1.4 makuna/RTC@^2.5.0 First Time Setup Uncomment the SetDateTime lines in setup() Upload to set the RTC time Comment them back out and upload again