Week 3: Good Night Phone Night Light

Assignment
Come up with a simple application using digital or analog input and digital output.

Inspiration
When it's time for bed, rest your phone here for an instant night light!

Materials & Tools
Book Board or Cardboard
White Card Stock
1 Photoresistor
1 LED
1 10k Ohms Resistor
1 220 Ohms Resistor
Wires
Female-to-Male Jumper Wires
Arduino
Power for the Arduino (I used my laptop via USB)
Hobby Knife
Tape

Process

Conclusions
Ambient light certainly impacts input readings from the photoresistor, even when covered by the card stock. This device as is needs to be calibrated for each new lighting situation.