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Sunday, September 12, 2010

Arduino Ethernet Clock Code


// Code to run an internet enabled digital clock
// gets data off the web and parses it
// Tom Wilson 9/2010
// Hardware is an Arduino D, Ethernet shield, and a big 20x4 LCD

#include <Ethernet.h>
// Borrowed code from a couple blogs....
// DHCP support
// Author: Jordan Terrell - blog.jordanterrell.com
//http://blog.jordanterrell.com/post/Arduino-DHCP-Library-Version-04.aspx
#include "Dhcp.h"

//Code to parse and scrape out the data you want
//http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1231812230

#include <LiquidCrystal.h>

// Include description files for other libraries used (if any)
#include <string.h>

// Define Constants
// Max string length may have to be adjusted depending on data to be extracted
#define MAX_STRING_LEN  21

// Setup vars
char tagStr[MAX_STRING_LEN] = "";
char dataStr[MAX_STRING_LEN] = "";
char tmpStr[MAX_STRING_LEN] = "";
char endTag[3] = {'<', '/', '\0'};
int len;
int line_num = 0;
int j = 0;

// Flags to differentiate XML tags from document elements (ie. data)
boolean tagFlag = false;
boolean dataFlag = false;

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(7, 6 , 5, 4, 3, 2);

boolean ipAcquired = false;
byte mac[] = { 0xDE, 0xAD, 0xDE, 0xED, 0xBE, 0xEF };
//byte ip[] = { 192, 168, 1, 113 }; for non dhcp
//byte server[] = { 72, 14, 204, 99 }; // Google
//byte server[] = { 76, 13, 115, 78 }; // yahooapis
byte server[] = { 199, 211, 133, 239 }; // tycho.usno.navy.mil

Client client(server, 80);

void setup()
{
  Serial.begin(9600);

  lcd.begin(20, 4);
  //backlight on pin 8
  pinMode(8, OUTPUT);
  digitalWrite(8, LOW);

  // some router may require a delay before it will route network packets
  // add a delay if needed:
  Serial.println("delaying...");
  delay(5000);
  Serial.println("getting ip...");
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("getting ip address...");
  int result = Dhcp.beginWithDHCP(mac);

  if(result == 1)
  {
    ipAcquired = true;
    digitalWrite(8, HIGH);
    
    byte buffer[6];
    Serial.println("ip acquired...");
    lcd.clear();

    Dhcp.getMacAddress(buffer);
    Serial.print("mac address: ");
    printArray(&Serial, ":", buffer, 6, 16);
  
    Dhcp.getLocalIp(buffer);
    Serial.print("ip address: ");
    printArray(&Serial, ".", buffer, 4, 10);

    //print the ip address to screen
    lcd.setCursor(0,0);
    lcd.print("IP Address obtained");
    lcd.setCursor(0,1);
    lcd.print(buffer[0],DEC);
    lcd.setCursor(3,1);
    lcd.print(".");
    lcd.setCursor(4,1);
    lcd.print(buffer[1],DEC);
    lcd.setCursor(7,1);
    lcd.print(".");
    lcd.setCursor(8,1);
    lcd.print(buffer[2],DEC);
    lcd.setCursor(11,1);
    lcd.print(".");
    lcd.setCursor(12,1);
    lcd.print(buffer[3],DEC);
  
    Dhcp.getSubnetMask(buffer);
    Serial.print("subnet mask: ");
    printArray(&Serial, ".", buffer, 4, 10);

    //print the ip address to screen
    lcd.setCursor(0,2);
    lcd.print(buffer[0],DEC);
    lcd.setCursor(3,2);
    lcd.print(".");
    lcd.setCursor(4,2);
    lcd.print(buffer[1],DEC);
    lcd.setCursor(7,2);
    lcd.print(".");
    lcd.setCursor(8,2);
    lcd.print(buffer[2],DEC);
    lcd.setCursor(11,2);
    lcd.print(".");
    lcd.setCursor(12,2);
    lcd.print(buffer[3],DEC);
  
    Dhcp.getGatewayIp(buffer);
    Serial.print("gateway ip: ");
    printArray(&Serial, ".", buffer, 4, 10);


    Dhcp.getDhcpServerIp(buffer);
    Serial.print("dhcp server ip: ");
    printArray(&Serial, ".", buffer, 4, 10);
  
    //print the ip address to screen
    lcd.setCursor(0,3);
    lcd.print(buffer[0],DEC);
    lcd.setCursor(3,3);
    lcd.print(".");
    lcd.setCursor(4,3);
    lcd.print(buffer[1],DEC);
    lcd.setCursor(7,3);
    lcd.print(".");
    lcd.setCursor(8,3);
    lcd.print(buffer[2],DEC);
    lcd.setCursor(11,3);
    lcd.print(".");
    lcd.setCursor(12,3);
    lcd.print(buffer[3],DEC);
  
    Dhcp.getDnsServerIp(buffer);
    Serial.print("dns server ip: ");
    printArray(&Serial, ".", buffer, 4, 10);
  
    delay(5000);
    /*
    Serial.println("connecting...");

    if (client.connect()) {
      Serial.println("connected");
      client.println("GET /search?q=arduino HTTP/1.0");
      client.println();
    } else {
      Serial.println("connection failed");
    }
    */
  
  }
  else {
    Serial.println("unable to acquire ip address...");
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("unable to acquire ip address");
  }

  delay(1000);


  Serial.println("connecting...");
  lcd.setCursor(0,0);
  lcd.print("Connecting...     ");


  if (client.connect()) {
    Serial.println("connected");
    digitalWrite(8, HIGH);
    lcd.clear();

    delay(2000);
    client.println("GET  /cgi-bin/timer.pl HTTP/1.0");  //get military time
    client.println();
  
  } else {
    Serial.println("connection failed");
    digitalWrite(8, LOW);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Connection Failed    ");
  }

}

void loop()
{

  line_num = 0;
  delay(1000);

  Serial.println("connecting...");
  
  while (client.available()) {
    serialEvent();
  }

  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    Serial.print("client.status = ");
    Serial.println(client.status(),DEC);

   client.stop();

  Serial.println("connecting...");

  delay(2000);
  if (client.connect()) {
    digitalWrite(8, HIGH);
    Serial.println("connected");
    client.println("GET  /cgi-bin/timer.pl HTTP/1.0");  //get military time
    client.println();
  
  } else {
    digitalWrite(8, LOW);
    Serial.println("connection failed");
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Connection Failed    ");
  }
  }
}

// Process each char from web
void serialEvent() {

   // Read a char
char inChar = client.read();
   //Serial.print(".");

   if (inChar == '<') {
      addChar(inChar, tmpStr);
      tagFlag = true;
      dataFlag = false;

   } else if (inChar == '>') {
      addChar(inChar, tmpStr);

      if (tagFlag) {    
         strncpy(tagStr, tmpStr, strlen(tmpStr)+1);
      }

      // Clear tmp
      clearStr(tmpStr);

      tagFlag = false;
      dataFlag = true;    
    
   } else if (inChar != 10) {
      if (tagFlag) {
         // Add tag char to string
         addChar(inChar, tmpStr);

         // Check for </XML> end tag, ignore it
         if ( tagFlag && strcmp(tmpStr, endTag) == 0 ) {
            clearStr(tmpStr);
            tagFlag = false;
            dataFlag = false;
         }
      }
    
      if (dataFlag) {
         // Add data char to string
         addChar(inChar, dataStr);
      }
   }

   // If a LF, process the line
   if (inChar == 10 ) {

/*
      Serial.print("tagStr: ");
      Serial.println(tagStr);
      Serial.print("dataStr: ");
      Serial.println(dataStr);
*/

      // Find specific tags and print data
      if (matchTag("<BR>")) {
         Serial.print(line_num);
         Serial.print(dataStr);
         Serial.println("");
         //lcd.setCursor(0,line_num);  
         //lcd.print(dataStr);
         if ((line_num > 0) & (line_num < 5)) {
             lcd.setCursor(0,line_num-1);  
             lcd.print(dataStr);
         } else {
             //line_num = 0;
         }
         line_num = line_num + 1;
         //if (line_num >4) line_num = 0;
      }

      
      // Clear all strings
      clearStr(tmpStr);
      clearStr(tagStr);
      clearStr(dataStr);

      // Clear Flags
      tagFlag = false;
      dataFlag = false;
   }
}

/////////////////////
// Other Functions //
/////////////////////

// Function to clear a string
void clearStr (char* str) {
   int len = strlen(str);
   for (int c = 0; c < len; c++) {
      str[c] = 0;
   }
}

//Function to add a char to a string and check its length
void addChar (char ch, char* str) {
   char *tagMsg  = "<TRUNCATED_TAG>";
   char *dataMsg = "-TRUNCATED_DATA-";

   // Check the max size of the string to make sure it doesn't grow too
   // big.  If string is beyond MAX_STRING_LEN assume it is unimportant
   // and replace it with a warning message.
   if (strlen(str) > MAX_STRING_LEN - 2) {
      if (tagFlag) {
         clearStr(tagStr);
         strcpy(tagStr,tagMsg);
      }
      if (dataFlag) {
      //   clearStr(dataStr);
      //   strcpy(dataStr,dataMsg);  just stop instead of killing the string
      }

      // Clear the temp buffer and flags to stop current processing
      clearStr(tmpStr);
      tagFlag = false;
      dataFlag = false;

   } else {
      // Add char to string
      if ((ch != '.') & (ch != ',')) str[strlen(str)] = ch;
   }
}

// Function to check the current tag for a specific string
boolean matchTag (char* searchTag) {
   if ( strcmp(tagStr, searchTag) == 0 ) {
      return true;
   } else {
      return false;
   }
}

void printArray(Print *output, char* delimeter, byte* data, int len, int base)
{
  char buf[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

  for(int i = 0; i < len; i++)
  {
    if(i != 0)
      output->print(delimeter);
    
    output->print(itoa(data[i], buf, base));
  }

  output->println();
}

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