5x5 Grid of light sensors (LDR) design

Other Hardware Sensors
1

Hi all,

I want to create a 5x5 array of light sensors using LDRs to detect between ambient light and shadow (so only light and dark).

The Idea:
It will be controlled by an arduino using 5 digital pins for the row selection and 5 analog pins for column selection like so:

Each VCC is a digital pin, and each ADC is an analog pin. The sensors will be analogRead one by one by turning on the appropriate pins.

Is this a practical solution? If so, can you guide me through how I would go about figuring about what the values on the resistors should be?

Thanks!