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How does one set the RTC on the Pi 5 and also recover the time from it?

andylhart

All is in the subject line. I Have a Pi 5 but have been unable to find out how to use the RTC, there is a a dearth of information it seems. 

  • 0 in reply to cstanton

    I think it's a cultural issue. On Reddit, the community can understand voting as a poll to vote for the best answer in the eyes of the community. I think this is not the case in the element14 community, instead of giving a downvote which many members may understand as a hostile act, simply propose another answer or respectfully indicate to the other that it may not be the most correct answer in your opinion. . . .

    As indicated in the Participation Guidelines and Code of Conduct, "not all actions have an inherently personal motivation or objective. This includes using features such as downvoting a comment. Comments may be downvoted for a variety of reasons, including relevance to the thread or topic, or in response to the question."

    (+) Participation Guidelines and Code of Conduct - element14 Community

    In this specific case, I am personally shocked by that negative vote. It is a cultural issue, but I would not give a negative vote to an answer that is in a helpful tone, that gives a lot of useful information and that is not fundamentally incorrect. What is an RTC module without battery? :P

    I also want to understand that scottiebabe is not giving a negative vote to shabaz but to the possible inaccuracy of the answer, even if it seems otherwise. In any case, they both have my admiration, it is great to have them both in the community.

  • 0

    On this topic, since we're still waiting for the cable assembly that has the battery, which I'm assuming is a CR2032, where can I make my own? I'm assuming it's some kind of JST plug for the socket, but I have no idea how to crimp for it or if there's an alternative available.

  • 0 in reply to stanto

    Please note that they do not recommend using a primary lithium cell for the RTC as it has a trickle charge circuit that is disabled by default. If enabled, this will kill the cell quickly.

    According to the Raspberry Pi 5 documentation, it is possible to use the RTC module even without a connected battery.

    https://www.raspberrypi.com/documentation/computers/raspberry-pi-5.html#real-time-clock-rtc

    image

    "The official battery part is a rechargeable lithium manganese coin cell, with a pre-fitted two-pin JST plug and an adhesive mounting pad. This is suitable for powering the Raspberry Pi 5 RTC when the main power supply for the board is disconnected, with a power-off current draw measuring in single-digit µA, giving a retention time that can be measured in months."