Outcome

• Dev 2 photoresistor ex 1: LED gradually turns bright when is under a shadow. Video
  
• Dev 2 photoresistor ex 2: LED immediately turns on when is under a shadow. Video
• Two-in-one-out device: With a photocell sensor and a button, when there is a bright environment, the button won't activate the LED; when there is a dark environment, pushing the button turns on the LED. Video 1. While the LED is on and shifting the environment from dark to bright, the LED will turn off. Then shifting from bright to dark, the LED will turn on again. Video 2