So, I’m wondering. What provisions does the Arduino have for time-keeping during runtime, and how does it compare with the Raspberry Pi? Oh, so this is interesting. The Arduino board has a crystal oscillator on it. So, that could function for it to get more accurate time-keeping than the Raspberry Pi, maybe.
So, how exactly does the Raspberry Pi do its time-keeping? What hardware does it use? Well, apparently it uses a built-in timer circuit on the SoC of some sort that is comparable to the timer circuit that other modern computers use to synchronize the operating system timer ticks. Also, modern operating systems don’t really continuously synchronize with the real-time clock (RTC) circuit, but rather generally only query it at boot time. So, suffice it to say, Raspberry Pi and Arduino are approximately equivalent in time-keeping functionality when properly calibrated. Maybe Arduino can do a little bit better at accurate time-keeping, but don’t expect anything particularly drastic.
20181206/https://en.wikipedia.org/wiki/Arduino
20181206/DuckDuckGo raspberry pi internal timer accuracy crystal oscillator
20181206/https://raspberrypi.stackexchange.com/questions/1397/how-accurate-is-raspberry-pis-timekeeping
20181206/https://raspberrypi.stackexchange.com/questions/7400/how-does-pi-keep-track-of-time-interval