ldr.ino

#include "config.h"

// analog pin 0
#define LDR A0
#define LED_PIN 5
// photocell state
int current = 0;
int last = -1;

// set up the 'analog' feed
AdafruitIO_Feed *analog = io.feed("photocell");
AdafruitIO_Feed *digital = io.feed("digital");
void setup() {

  // start the serial connection
  Serial.begin(115200);
   pinMode(LED_PIN, OUTPUT);
  // wait for serial monitor to open
  while(! Serial);

  // connect to io.adafruit.com
  Serial.print("Connecting to Adafruit IO");
  io.connect();
  
  digital->onMessage(handleMessage);
  
  // wait for a connection
  while(io.status() < AIO_CONNECTED) {
    Serial.print(".");
    delay(500);
  }

  // we are connected
  Serial.println();
  Serial.println(io.statusText());

}

void loop() {

  // io.run(); is required for all sketches.
  // it should always be present at the top of your loop
  // function. it keeps the client connected to
  // io.adafruit.com, and processes any incoming data.
  io.run();

  // grab the current state of the photocell
  current = analogRead(LDR);

  // return if the value hasn't changed
  if(current == last)
    return;

  // save the current state to the analog feed
  Serial.print("sending -> ");
  Serial.println(current);
  analog->save(current);

  // store last photocell state
  last = current;

  // wait one second (1000 milliseconds == 1 second)
  delay(1000);
  
}
void handleMessage(AdafruitIO_Data *data) {

  Serial.print("received <- ");

  if(data->toPinLevel() == HIGH)
    Serial.println("HIGH");
  else
    Serial.println("LOW");
  digitalWrite(LED_PIN, data->toPinLevel());
  }