Problem with DS1307 on KC868-A6

[Ramalcu]

your code already is running correctly. you can also install DS1307 arduino library, then chose a example demo run testing.

I cannot believe you confirm my code is running correctly. A NAK answer after a Write Request to 0x68H is an evidence something is wrong in the hardware. Furthermore, if the scanner only sees both PCF8574 but not the DS1307 is a confirmation that I2C is working but the DS1307 don't.

I replaced the DS1307 chip on the PCB and now it is working as expected.

Thank you.