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sebinspace , 4 months ago I can put an RTC in an Arduino for about $8. It keeps time accurately. If it gets out of sync, maybe a Bluetooth connection to let it do an NTP request through another device. Cellular connectivity is not required.
I can put an RTC in an Arduino for about $8. It keeps time accurately. If it gets out of sync, maybe a Bluetooth connection to let it do an NTP request through another device.
Cellular connectivity is not required.