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.
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.