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0answers
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Installing Tracks 2.2.3 on Raspberry Pi

I want to install Tracks on my Raspberry Pi for task/time management. My Pi is running the latest Raspbian, i.e. I have updated it to the latest package versions. There is a rather cryptic guide on ...
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0answers
39 views

ntpq -p reports all available servers have stratum 16

ntpq -p reports all available servers have stratum 16. Therefor the time is cannot be set. However I can ping all the servers. ntpq -p remote refid st t when poll reach delay ...
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2answers
49 views

Smallest interval that RPi can record

I was planning to determine light speed by myself(which is 3*10^8 m/s). I have kept 2 sensors, and I need to know the time interval as light strikes the sensors. It lies somewhere about 50nanoseconds. ...
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0answers
34 views

Reliable timed system with low power consumption over rasbpian [closed]

I'm building a simple irrigation system which uses a Raspberry Pi to open and close a solenoid water valve. In general, the system should open the valve for set intervals of time every so often (E.g. ...
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1answer
145 views

Chrony 506 Cannot talk to daemon

I'm having trouble configuring chrony to sync the time between my raspberry pi and a desktop computer in an isolated network. My raspberry pi's chrony.config file looks like this: server master ...
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2answers
170 views

Make RPi keep an semi-accurate time after power loss

I use Motion detection and a webcam as a security camera. It's headless with no internet or keyboard. To turn the camera off while it's not need I just turn the power supply off. Because I shut it ...
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3answers
2k views

After reboot, my RPi is one hour off — How to adjust for Daylight Savings problems?

The electricity to my apartment went out a few days ago. I use my RPi to record data and store it in a database. I've just learned that the time for all my data has been off by an hour because the ...
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3answers
2k views

How does Pi keep track of time interval?

As I understand RTC is needed to keep track of time. However, Raspberry Pi does not have that and use NTP servers to synchronize its time. All that is fine, but how does Pi know that one millisecond ...
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5answers
39k views

Where does the Raspberry Pi get the time from?

I don't have to set the clock (besides the timezone) on the Raspberry Pi. Where is it getting the time from? About how accurate is it?
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3answers
4k views

How is time kept on the RPi?

Can anyone explain to me how time is kept on an RPi with the latest Raspian release? What sets the internal clock from an NTP server? What happens when no NTP server is availible? From my program I ...
11
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2answers
2k views

How accurate is Raspberry Pi's timekeeping?

I realize that since Raspberry Pi doesn't have a real-time clock built in, some issues with accurate timekeeping may present themselves, even when persistence across reboots is not a requirement. This ...