The hardware prototype is described on hackaday.io: Sun Tracker prototype

The hardware schematic is the following:

In the loop():

• change LED blinking according to WIFI status
• read the settings (max_error, sensitivity, update_period, start_time, stop_time) and apply them to the SunTracker object
• call:
  • LED_loop
  • SunTracker.loop (only if now time is inside start_time and stop_time)
  • AutoConnect loop
• config the local time (by NTP) using the TimeZone (at any time Internet is newly available)
• enable / disable the sun tracking according to start_time and stop_time. It works only if the local time was set by NTP at least once after reboot.

See also AutoConnect by Hieromon

• Automatically start a WIFI hostpot (ESP32 softAP) with a captive portal at first run of if there's no connection to a WIFi hotspot
• Let to connect to a WIFI hotspot
• Reconnect in case of reboot or connection lost
• Let to change settings with a web interface

In its constructor receives the pins where:

• PDR1, PDR2, RELE1, RELE2, RUNEND1, RUNEND2 are connected

• Read the two photo resistors: PDR1 and PDR2

• Check if the average of PDR1 and PDR2 values is above the minimum required (sensitivity)

• Compare their values with max_error

• Activate the two relays to rotate the DC motor to a new position in which abs(pdr2-pdr1) < avg(PDR1,PDR2) * max_error/100

• Stop both relays if one of the End-Of-Run is reached (closed)