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`DeviceRead["RaspiCam"]` should return an image on the Pi, and I've checked that it does for me. If you encounter issues with that, please let us know here. `$ImagingDevices` , `ImageCapture` , `CurrentImage` , etc. are not supported on the Pi. ...
So what you want to do here is read the photocell voltage as a digital value.  The circuit is really just an RC circuit that allows you to "measure" the resistance of the photocell as a digital value.  Since you are measuring you'll want to...
Your DeviceRead evaluation threw a message because there is a typo in the name.  It should be: DeviceRead["RaspiCam"] DeviceRead, not CurrentImage/ImageCapture is the supported way to read from the RaspiCam. Happy coding!
Luc, I believe you are on Mac.  Logitech cameras often have issues on Mac.   Most of them are not UVC-compliant (USB video device class) which is what is needed for support on Mac.  They do put out some Mac models which are UVC-compliant, but I have...