Position control using wifi from a smartphone sounds too good to be true? Do it with MKR1000.
by Miguel Sánchez
It's a Morse code receiver base on processing the light signals.
Project showcase by Alireza Karkon
Using an optical flow sensor to turn gestures in the air into mouse movements.
Project tutorial by Arnaud Taffanel and Kristoffer Richardsson
Grab an Arduino and turn it into a Power Point pointer using an IR sensor and your TV remote.
Project tutorial by Hugo Gomes
If wifi connection fails (i.e. router down) your current code will block forever. You may want to limit the number of connection attempts.
Your belt for X-axis is not parallel to the axis of motion but at an angle. This brings two problems: (1) position error and (2) uneven belt tension.
You have some details here https://www.electronicshub.org/light-sensors/
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