Tagged Questions

a Real time Clock, a computer clock.

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1
vote
0answers
12 views

Raspberry Pi with gertduino to use the rtc

I just setup my raspberry pi with the gertduino and I tried the given blink example. It works fine and now I wanted to use the rtc from the gertduino to set the time from the raspberry. How ever I ...
0
votes
0answers
44 views

Why is my RTC DS1307 not being recognized?

I'm trying to wire up a DS1307 RTC to my Model B Pi. I'm following the diagram as shown in this crude image and I've also tried it like this but it isn't recognized by the Pi. When I run i2cdetect ...
1
vote
0answers
54 views

Should I remove fake-hwclock because my i2c RTC isn't always plugged in?

I have a i2c RTC (rtc-pcf8563) that runs great, but I don't always have it plugged in; is there a way to test to see if the RTC is plugged in and, if not, start fake-hwclock or will I have to dpkg ...
0
votes
2answers
78 views

Connecting RTC DS1037, Pin 5 already occupied

I think of adding a RTC Module to my Raspberry Pi. I found the following tutorial. http://www.forum-raspberrypi.de/Thread-tutorial-realtime-clock-rtc-ds1307-am-raspberry-pi-betreiben In general it's ...
0
votes
0answers
2k views

hwclock cannot access hardware clock via any known method

I am following adafruit RTC tutorial. If I run: sudo i2cdetect -y 1 I see #68 in the output. Then I run: sudo modprobe rtc-ds1307 sudo bash echo ds1307 0x68 > ...
0
votes
2answers
1k views

How to connect DS1307 5V Real time clock (RTC) to 3.3V?

I have DS1307 small SMD parts so I can't simply leave out the resistors easily to make it work with 3.3V by default as with adafruit kit tutorial. How could I connect this device to my Raspberry Pi ...
5
votes
1answer
629 views

Would it be possible to use the DS1302 made for Arduino?

I got some spare DS1302 chips that I'd like to connect to my Raspberry Pi to use as a RTC, but I'm not so sure how to. How would I go about it?
0
votes
1answer
208 views

Raspbian Kernel panic after RTC module .ko - How to unload modules at boot time?

I am playing with the RasClock RTC module. After baking my own rtc-pcf2127a.ko, and following the tutorial from the website, I got a kernel panic when booting (Null pointer etc.) Could not find any ...
0
votes
1answer
144 views

LCD with RTC and GPS

I have purchased a LCD board, a real time clock board, and a GPS board. I have soldered the LCD onto the breakout board as instructed and put the realtime clock together following the tutorials. At ...
2
votes
4answers
3k views

How can I automatically update the hwclock with NTP when I have internet connection

I'm using an RPi with Raspbian which runs the NTP-daemon by default. I have connected an rtc-ds1307 external i2c hardware clock. I was following the instructions given here to set it up: ...
0
votes
1answer
2k views

What does UU mean for RasClock

I acquired a RasClock made by After Thought Software (http://afterthoughtsoftware.com/products/rasclock) . This is a real time clock using i2c. I wanted to play with its other features via i2c but ...
6
votes
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 ...
0
votes
1answer
159 views

Determining if network time has been set [duplicate]

I want to add a h/w rtc to my RPi. If network time is available, I want to determine this, and use it to set the system time and also update my own rtc. How can I find if network time is ( or becomes ...
-1
votes
1answer
972 views

Configuring to read RTC at boot time

I have added an RTC to the I2C bus of the Raspberry Pi. If I follow the steps mentioned here (I am using the DS1307 RTC IC), I can run hwclock and read the time. root@raspberrypi:~# modprobe ...