The ldr_RC_time_check.py is used for find out RC time constant using Python gpiozero module. The ldrorg.py is used to turn on LED connected to GPIO 17 using gpiozero module of Python. The ldr_spy.py is for find out RC time constant using Python time module. The newldr.py is for find out RC time constant using Python time module and turn on LED during dark. For more information visit http://chipprogrammer.blogspot.com/2017/04/sensing-light.html