Each Pi keeps time internally, whether or not it has an RTC.
The clock is set from the network when it connects at startup.
The Pi5 has an RTC, by adding the battery it will keep time while switched off, not needing a network to get the time from on startup.
But a simple logging application could be built on a Pico, which has an ADC built in. Picos can have an SDCard connected for removable storage. IIRC, they also have an RTC, but you would need to add a standby battery to retain time when power is removed. I'm not sure how the RTC is set -- you might have to add code for that.
I'll pass the baton on for more info about 4g dongles, either on Pi (USB) or Pico.
The clock is set from the network when it connects at startup.
The Pi5 has an RTC, by adding the battery it will keep time while switched off, not needing a network to get the time from on startup.
But a simple logging application could be built on a Pico, which has an ADC built in. Picos can have an SDCard connected for removable storage. IIRC, they also have an RTC, but you would need to add a standby battery to retain time when power is removed. I'm not sure how the RTC is set -- you might have to add code for that.
I'll pass the baton on for more info about 4g dongles, either on Pi (USB) or Pico.
Statistics: Posted by davidcoton — Sat Jul 27, 2024 1:39 pm