# Real Time Clock (RTC) for the Raspberry Pi Controller **URL:** \ **Category:** Uncategorized\ **Created:** [September 22, 2022, 8:45am UTC](https://forum.onefinitycnc.com/t/real-time-clock-rtc-for-the-raspberry-pi-controller/15431 "2022-09-22T08:45:56Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [September 22, 2022, 9:23am UTC](https://forum.onefinitycnc.com/t/real-time-clock-rtc-for-the-raspberry-pi-controller/15431/2 "2022-09-22T09:23:35Z")
Hey imgona, yes, _[adding a RTC to Raspberry Pi](https://metager.org/meta/meta.ger3?eingabe=raspberry+rtc&focus=web)_ should be easily feasible, there are many modules offered for this. But the [ntp daemon](https://en.wikipedia.org/wiki/Ntpd) which can be installed on Onefinity Controller which uses the [NTP Protocol](https://en.wikipedia.org/wiki/Network_Time_Protocol) is more precise than a [quartz-based rtc](https://en.wikipedia.org/wiki/Real-time_clock#Timing) which may loose seconds per month. Of course NTP requires the Onefinity Controller to have network access to a NTP time server. You may also equip the Onefinity Controller or a computer in your local net with a [radio-based clock](https://en.wikipedia.org/wiki/Real-time_clock#Radio-based_RTCs) (here we use the [DCF77](https://en.wikipedia.org/wiki/DCF77) long-wave radio signal that receives its time from the atomic clock of the Physikalisch-Technische Bundesanstalt, a [similar service may be present](https://en.wikipedia.org/wiki/Radio_clock#List_of_radio_time_signal_stations) in your part of the world) which also works in case internet connection is absent. ![Low_cost_DCF77_receiver](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/0/d/0d105fa2310772998c90155318b8f02d2e20bc8c.jpeg) Radio-clock receiver --- _[View the full topic](https://forum.onefinitycnc.com/t/real-time-clock-rtc-for-the-raspberry-pi-controller/15431)._