Arduino Real Time Alarm Clock DS3231 with TM1638. Arduino Clock with Battery backup (real time clock), Time, Date, Alarm, Temperature, TM1638 seven segment module output and input, Display Sleep mode.

Scientific mode: Enables advanced operations. In this mode, the same keys are reassigned to: A – sin (value) B – cos (value) C – tan (value) D – sqrt (value) * – Clear input; Switching: The push ...