What is the DS1307 RTC? The DS1307 serial real-time clock (RTC) is a lowpower, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Address and data are transferred serially ...

The Arduino Mega's PWM pins are digital output pins located ... If your board has no printed labels, check out its pinout diagram documentation (found on the board's Arduino Store page).