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The Raspberry Pi does not have any analog input PINs. Thus you will not be able to interpret analog input signals without some additional hardware. In order to be able to read not only HIGH or LOW levels from your sensor, you need to use an analog-to-digital converter (ADC), e.g. in the form of a ADC-HAT extension for the Rasperry Pi. Then you can connect ...


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timedatectl will show if synced Local time: Tue 2019-11-19 09:59:09 AEDT Universal time: Mon 2019-11-18 22:59:09 UTC RTC time: n/a Time zone: Australia/Sydney (AEDT, +1100) System clock synchronized: yes NTP service: active RTC in local TZ: no /var/lib/systemd/timesync/clock ...


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Since systemd 239 there is a systemd-time-wait-sync.service available that you can just use in your systemd service to start After=systemd-time-wait-sync.service. For further information look at How can I delay the startup of systemd services until the datetime is set (no RTC on the Raspberry Pi). Raspbian Buster comes with systemd 241. The problem is that ...


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If you install ntpd instead of timesyncd, you can check out the first line of the output of ntpstat: $ ntpstat | head -n1 unsynchronised ... later on .. $ ntpstat | head -n1 synchronised to NTP server (10.5.26.10) at stratum 2 Inside a script or a C program, use the return code: ntpstat returns 0 if clock is synchronised. ntpstat returns 1 if clock is ...


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