RTC That Just Works

[Raspoootin]

I need a RTC that I can install and the software to run it
is available via apt-get or is already included in the wheezy
distro. I'm not gonna go compile my own modules and source code.
So is there a clock that fits this?
I need plug-n-play.

[scotty101]

http://learn.adafruit.com/adding-a-real ... t-rtc-time

If you don't want to compile your own code or install anything then perhaps raspberry pi isn't the right thing for you..
If you don't want to install a RTC then you might want to consider periodically updating the time from the internet.

[ghans]

The linked tutorial is for the Adafruit Occidentialis distro
( and the RTC Adafruit sells for the Pi ) .
This might make things easier , but i believe your definition
of plug'n'play might only be matched by another ARM board.

ghans

[Joe Schmoe]

The Internet is your RTC.

[Raspoootin]

So there aren't any RTC modules with quick/easy software already included....yet. I'll check into the subject again later. As sales increase
and the market expands perhaps adafruit or someone else will do a
kit and have the wares included in the base debian distro.
I prefer to save my inner geek for other projects at this time.
Thx gurus.

[BJNZ]

You could try the RasClock MODMYPI is selling. The hardware is ready assembled. Just insert the battery and plug into the Pi. You will have to do some software installing but the instructions are clear. It would probaly take less then 15 minutes all up.
Although I have built my own RTC adaptors I am going to try one out because it can fit in a case.

Brent

[jamesh]

So there aren't any RTC modules with quick/easy software already included....yet. I'll check into the subject again later. As sales increase
and the market expands perhaps adafruit or someone else will do a
kit and have the wares included in the base debian distro.
I prefer to save my inner geek for other projects at this time.
Thx gurus.

innergeek doesn't wear out/expire if you use it for stuff like this. It only wears out with age.

[rudiratlos]

This works with std. linux drivers. No compiling needed.

http://shop.basis.biz/shop/Raspberry-PI ... ack-board/

[asandford]

This works with just 4 wires, supported by hwclock:

http://dx.com/p/high-accuracy-ds3231-mo ... lue-168974

Takes a couple of weeks to deliver to UK

[Joe Schmoe]

This works with just 4 wires, supported by hwclock:

http://dx.com/p/high-accuracy-ds3231-mo ... lue-168974

Takes a couple of weeks to deliver to UK

What's the hookup between that board and the Pi?

[asandford]

What's the hookup between that board and the Pi?

It connects to the I2C bus and is read by hwclock -r

Code: Select all

pi@raspberrypi ~ $  i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
pi@raspberrypi ~ $ hwclock -r
Wed 01 May 2013 17:48:33 BST  -0.959643 seconds
pi@raspberrypi ~ $

[Joe Schmoe]

Could you please be more explicit?

What connects to what?

[asandford]

Could you please be more explicit?

What connects to what?

Code: Select all

RTC Board     PI GPIO Header 
--------------------------------------------
GND    ------> GND (Pin 9 / 25 / 20 / 14 / 6)
VCC    ------> 3V3 (Pin 1 / 17)   
SDA    ------> SDA (Pin 3)
SCL    ------> SCL (Pin 5)

[Joe Schmoe]

Thanks.

I love it when people are explicit.