This guide works with all versions of Raspberry Pi except the compute modules which do not have a header. Older Raspberry Pi revisions 1 and 2 will require a 26-pin Cobbler and newer versions make use of the Cobbler Plus 40-pin GPIO connector. We provide wiring diagrams for both 40-pin and 26-pin below.

The RTC will allow a Raspberry Pi to know the time, even when not connected to the Internet. As such it is not essential to this project if your Raspberry Pi is going to have an Internet connection.

The diagrams show GND connections in blue, +5V in red and +3.3V in purple.

The I2C bus connections use orange wire for SDA and yellow for SCA. 

40-Pin (A, B, B+ and Zero) Cobbler Plus Schematic

26-Pin (Raspberry Pi Rev 1 and Rev 2) Cobbler Schematic

You may also like to look at separate tutorials for the RTC and temperature sensor

When everything is assembled, you can connect the ribbon cable to the GPIO connector. Remember to have the red or white band of the ribbon cable towards the SD card on the Raspberry Pi.

This guide was first published on Apr 03, 2013. It was last updated on May 17, 2024.

This page (Hardware) was last updated on Mar 08, 2024.

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