I have just published the source code of the solar tracker.

You can find it on my github page here : ESP32 Solar Tracker

This code implements exactly the current status of the tracker as shown into the video

Features implemented are :

• try to connect to internet
• get the UTC time over NTP server
• compute the sun position using the excellent solar calulator library (licensed under the MIT License)
• compute the stepper motors motion
• read the power voltage
• perform the motion if the power level is enough to drive the motors
• apply a sleeping strategy (sleep 10 minutes during day or sleep the whole night)
• reset to the next morning position if needed
• sleep and wake up next time