Raspberry Pi RTC Module

Well I purchased this High Precision Real Time Clock for my Raspberry Pi.

They had a nice article on how to get it working here.

I pretty much followed it exactly and it worked fine, but I am going to relist the steps here in case I need them again later or the article moves etc.

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# Remove the module blacklist entry so it can be loaded on boot

sudo sed -i 's/blacklist i2c-bcm2708/#blacklist i2c-bcm2708/' /etc/modprobe.d/raspi-blacklist.conf



# Load the module now

sudo modprobe i2c-bcm2708



# Notify Linux of the Dallas RTC device

# on my 256Mb Pi I used.

echo ds1307 0x68 | sudo tee /sys/class/i2c-adapter/i2c-0/new_device

# on my new Pi B+

#echo ds1307 0x68 | sudo tee /sys/class/i2c-adapter/i2c-1/new_device



# Test it out.

sudo hwclock

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once that was done:

# Add the RTC device on boot

sudo sed -i 's#^exit 0$#echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device#' /etc/rc.local

#dont forget to change i2c-0 or i2c-1



echo exit 0 | sudo tee -a /etc/rc.local



#This doesn't cover automatically setting the clock on boot and but you can do so by adding another line (above exit 0) to rc.local with;



hwclock -s