Awesome! I really love the usage of the photodiode, as well as the camera, both are pretty thoughtful finishing touches that elevate this to more than "a cool digital frame".
How much does the display cost, if I were to make a frame like that too?
The cheapest 5k iMac is $1799, other comparable displays are roughly in the same ballpark. I imagine the other items (frame, sensors) are trivial compared to that expense.
Replacement 5k panels for the iMac (LM270WQ1) are merely $800 on AliExpress, but you'd have to figure out how to output to them.
How much does the display cost, if I were to make a frame like that too?