Light Sensor Question1

Has anyone made their own Light Sensor for the Square Bot? I don’t have enough money in my budget for the Vex Light Sensors, so I was wondering if anyone has purchased their own Light sensors and resistors and made their own, or purchased the OSEPP ( pre made one and 3d printed a holder for it. I know these can’t be used in competition, but i was thinking about for in the classroom.

He said for classroom

What exactly do you mean by square bot?

I think a robot that is has the same length and width.

this is the link to the square bot