Questions tagged [rtc]
a Real time Clock, a computer clock.
92 questions
1 vote
1 answer
155 views
Is the Pi5 RTC able to re-active a sleeping powerbank and finally power on the Pi?
The Pi5 has a RTC. My (prospective) Pi will be powered from a power bank that might power off, when the Pi is shutdown, as the power consumption will drop to "single-digit µA" (manual). The ...
- 113
0 votes
1 answer
3k views
What kind of JST connectors are needed for the Raspberry Pi 5?
All of the documentation I can find for the new JST headers on the Raspberry Pi 5 fails to mention which series of JST connectors it uses. If I want to make up my own 4-pin PWM fan, 3-pin UART or 2-...
- 4,410
0 votes
0 answers
131 views
Raspberry Pi 4 - hwclock DS3231 RTC delay at boot
Running a Raspberry Pi 4 with a DS3231 RTC setup. Everything is setup correctly and working fine and the hwclock is synced correctly. The unit is running without any internet connection. The problem ...
- 1
2 votes
1 answer
1k views
RPi4 Bullseye Cannot retain rtc-ds3231 hwclock value when internet is OFF
I followed all instructions from Adafruit website but the system clock is still not set after I turn off the internet. **The clock resets to 2000-01-01 00:00:00 when I turn off internet, shutdown, ...
- 21
0 votes
0 answers
1k views
How to give the on-chip RTC a power backup in Raspberry Pi Pico?
I need a power backup for the on-chip RTC on the Raspberry Pi Pico, like a button cell which is quite common. Someone suggested placing a 1.5V button cell between the VSYS pin and the ground. Would ...
- 1
0 votes
1 answer
672 views
RTC on Raspberry Pi Bullseye shows correct time but is not registered at boot time
I am testing different RTC modules on RPi 4 running on Bullseye. On testing DS3231, I add the module to /boot/config.txt dtoverlay=i2c-rtc,ds3231 I can read the clock from it wihtout a problem. But ...
3 votes
2 answers
3k views
Turn on pi at specific time with RTC to save battery
I'm looking into powering my raspberry pi via a powerbank. I already have a button and a relay to turn it on manually and when the pi shuts down flip the relay back to off position. Now I would like ...
- 65
0 votes
1 answer
421 views
why does my Pi clock survive a reboot without an RTC or internet?
It seems time on my RPi 3B v1.2 survives a reboot without either an RTC or an internet connection. I was given the Pi used by someone else, but I'm pretty sure I don't see an RTC connected to it. [
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