Neuftech I2C DS1307 AT24C32 really time clock modules for Arduino UNO R3 Mega2560 Nano tiny Tiny RTC - Real Time Clock Module (electronics)
Maybe I just had bad luck with this module. Does it work only as long as the 5V voltage at VCC. If this voltage is no longer present, then the button cell CR2032 should provide the DS1307 further. Unfortunately, this is not the case, although the pin
