Photoresistor
With light, there is less resistance
Without light, there is more resistance
High resistance, semi-conductor material. When light hits the device it absorbs the light photons; this process provides energy to the electrons
Analog signals
Continuous signals
Digital signals
Discrete, and in one of two states – 0 or 1 (LOW or HIGH)
HERO Board
A0 – Analog Pin
Arduino Serial Monitor
Window where software can talk to microcontroller
Establish a serial communication connection between IDE and Board
Then, Tools, Serial Monitor (in IDE) to view the data from the board (Photoresistor output)
analogRead ();
Allows HERO board to read analog signals
Measure voltage from 0V to 1023 (5V)
We are “reading” information from photoresistors and “writing” to devices like LEDs