The Raspberry Pi does not have a RTC (Real Time Clock) module and it is not able to keep the date and time without a power source. If your Raspberry Pi is not connected to the Internet, you are out of luck and the only option is to buy and install an RTC module. However, if it has Internet, you can make it sync the date and time from a time-server.

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SerialProtocol is a software protocol for sending structured data via serial between two Arduino, two Raspberry Pi, or an Arduino and a Raspberry Pi.

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