Dev Site for PG

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

PinMode (in Setup):

-Switches – input

-LEDs – output

// #define CABIN_LIGHTS_PIN 10 // pin controlling the cabin lights
// #define STORAGE_LIGHTS_PIN 11 // pin controlling the storage lights
// #define COCKPIT_LIGHTS_PIN 12 // pin controlling the exterior lights
const byte CABIN_LIGHTS_PIN = 10; // pin controlling the cabin lights
const byte STORAGE_LIGHTS_PIN = 11; // pin controlling the storage lights
const byte COCKPIT_LIGHTS_PIN = 12; // pin controlling the exterior lights

Note: In past, we used #define to set system-wide variables. Now we’re using const byte.

Const (Constant) – has to remain the same value