DS1337 Real Time Clock (RTC)
Wiring diagram for the DS1337 RTC.
Scheme shows a 555 component but is must be a Ds1337 RTC
Crystal must be a 32.768 kHz, directly wired to 1 and 2 pins of DS1337.
Pull-up resistances are 10kOhms
The real battery is a 3V Li coin battery inside its socket CR2032.
Arduino Power is not showed in the scheme