Hi I wanted to make use of an older Raspberry Pi and build an Volumio Music Player. I ordered Hifiberry Digi+ clone (PiFi Digi+ V1.0), unfortunately I forgot I own an older Raspberry Pi 1 B with the 26PIN interface and unpopulated P5 header.

There are actually versions of this board on the market suited for Raspberry Pi 1, but before I order more electronic junk I wonder, whether there is a possibility to connect the board using the P5 header.

Hifiberry states:

GPIOs 18-21 (pins 12, 35, 38 and 40) are used for the sound interface. You can’t use them for any other purpose.

I already found an topic describing the inverted issue: 26PIN header board and Raspberry Pi 2

Are the first 26 header pins actually compatible between Raspberry Pi 1 and 2 ? If so, I would only need to connect pins pins 12, 35, 38 and 40 on the card to the P5 header.


It should work, and as you already have the card you could try if it physically fits.

However there are NO "extension" cables available and making a 26 pin M-F cable is not feasible (due to lack of parts). You would need to make an adapter board.

You could use a a stacker header as an adapter.

I have done something similar (connecting a Gertboard to 40 pin Pi) by soldering a right-angle connector on top. This is tricky soldering, and you have to be aware of the crossed connections.

See https://www.raspberrypi.org/forums/viewtopic.php?f=42&t=76280&p=544846#p544846 and https://www.raspberrypi.org/forums/viewtopic.php?p=324528

Personally I would just buy a newer Pi!

  • Thanks for your reply. I am still trying to figure out the right pinout. I am even not sure about the right pinout of the audio card. It would but be just fine to connect the card and the RPi with cables.
    – karlitos
    Dec 8 '18 at 9:59

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