arduino interval test code

ard-interval-test.ino

//Twitter-Stepper Test

#include <SPI.h>
#include <Ethernet.h>
#include <TextFinder.h>

#include <Stepper.h>
#define STEPS 200

// interval declarations
long previousMillis = 0;
long interval = 10000; // interval to send GET request

// MAC address and server DNS:
byte mac[] = {  
  0x90, 0xA2, 0xDA, 0x00, 0x7E, 0xE9 };
char server[] = "twitknit-json-parsing.herokuapp.com";

EthernetClient client;
TextFinder finder (client);

Stepper stepper1(STEPS, 2, 3, 4, 5);

// declare global tweetCount var 
long tweetCount = 0;

void setup() {

  // set stepper speed
  stepper1.setSpeed(60);

  // start the serial library:
  Serial.begin(9600);

}

void loop() {

  // interval: check the difference between current time and time GET request sent
  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > interval) {

    //save the last time GET request sent
    previousMillis = currentMillis;

    // start the ethernet connection:
    Ethernet.begin(mac);

    if (Ethernet.begin(mac) == 0) {

      Serial.println("Failed to configure Ethernet using DHCP");
      // no point in carrying on, so do nothing:
      while(true);
    }

    // give the ethernet shield a second to initialize:
    delay(1000);
    Serial.println("connecting...");

    // if you get a connection, report back via serial:
    if (client.connect(server, 80)) {

      Serial.println("connected");

      // make HTTP GET request
      client.println("GET / HTTP/1.0");
      client.println("HOST: twitknit-json-parsing.herokuapp.com");
      client.println();

    } 
    else {

      // if connection failed:
      Serial.println("connection failed");
    }

    // if there are incoming bytes available from the server, read them and print them
    if (client.available()) {
      char c = client.read();
      Serial.print(c);

      // TextFinder code and stepper instructions:
      if (finder.find("*") == true) { //find asterisk
        long tweetCount = finder.getValue(); // get integer string (tweet count)
        Serial.print(tweetCount);
        Serial.println(" tweets");

        // stepper instructions upon recieving tweets:
        delay(500);
        stepper1.step(tweetCount * -500);
      }
    }

    // if the server is disconnected, stop the client:
    if (!client.connected()) {
      Serial.println();
      Serial.println("disconnecting");
      client.stop();

      // do nothing more
      while(true);
    }    
  }
}