I plan on building a portable battery-backed NAS and would like to add some physical push-buttons and LEDs etc.. I was wondering if it would be possible to use the 40pin FFC conectors for this. Could the pins be used as a kind-of GPIO interface that the normal raspberry pi has? If not, is there any other way one can build custom solutions with IO devices, such as buttons, LEDs, sensors, actuators, etc.?
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For the FFC pinout, please see this post: https://www.axzez.com/forum/main/comment/627fb192bf0c630016bdcfce
While the FFC connectors are intended for a future networking expansion, it can be used for other things. Each FFC connector includes I2C, 2 GPIO, and power. The I2C can be connected to a chip like AW9523 to create additional GPIOs. One of the connectors exposes GPIO4/5, and the other connector exposes GPIO6/7. Each connector also provides 1.5A @ 3.3V. If there is interest, we will document the pinout.
Will respond soon, @david.mcgurty