1. /*
  2. Magic orb project
  4. A simple web server used to show a message on an LCD display
  6. */
  7. #include <SPI.h>
  8. #include <Ethernet.h>
  9. #include <LiquidCrystal.h>
  11. LiquidCrystal lcd(12, 11, 9, 5, 4, 3, 2);
  12. byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
  13. EthernetServer server(80);
  16. void writeDisplay(char* text)
  17. {
  18. lcd.clear();
  19. unsigned int len = (unsigned int)strlen(text);
  20. int lines = len / 20 + 1;
  21. for(int i = 0; i < lines; i++) {
  22. lcd.setCursor(0,i);
  23. char line[21];
  24. memset(line, ' ', 20);
  25. line[20] = '\0';
  26. strncpy(line, &text[i*20],20);
  27. lcd.print(line);
  28. }
  29. }
  31. void writeDisplay(String text)
  32. {
  33. char tmp[256];
  34. text.toCharArray(tmp, 256);
  35. writeDisplay(tmp);
  36. }
  38. void setup() {
  39. Serial.begin(9600);
  40. lcd.begin(20,4);
  41. lcd.clear();
  42. writeDisplay("Webserver Running. Awaiting text!");
  44. Ethernet.begin(mac);
  45. // print your local IP address:
  46. Serial.print("My IP address: ");
  47. for (byte thisByte = 0; thisByte < 4; thisByte++) {
  48. // print the value of each byte of the IP address:
  49. Serial.print(Ethernet.localIP()[thisByte], DEC);
  50. Serial.print(".");
  51. }
  52. Serial.println();
  54. }
  56. void loop() {
  58. // listen for incoming clients
  59. EthernetClient client = server.available();
  60. if (client) {
  61. // an http request ends with a blank line
  63. boolean gettingUrl = false;
  64. int urlCounter = 0;
  65. char url[256];
  66. char previousChars[6];
  67. memset(previousChars, '\0', 6);
  68. memset(url, '\0', 256);
  69. boolean currentLineIsBlank = true;
  70. while (client.connected()) {
  71. if (client.available()) {
  72. char c = client.read();
  74. if (c == '\n' && currentLineIsBlank) {
  75. // send a standard http response header
  76. String text(url);
  77. text.replace("%20", " ");
  78. //
  79. if(text != "favicon.ico")
  80. writeDisplay(text);
  81. client.println("HTTP/1.1 200 OK");
  82. client.println("Content-Type: text/html");
  83. client.println();
  85. client.print("Wrote to display: ");
  86. client.print(text);
  87. break;
  88. }
  89. if (c == '\n') {
  90. // you're starting a new line
  91. currentLineIsBlank = true;
  92. }
  93. else if (c != '\r') {
  94. if(c == ' ' && gettingUrl) {
  95. gettingUrl = false;
  96. }
  98. if(gettingUrl) {
  99. url[urlCounter++] = c;
  100. }
  102. // you've gotten a character on the current line
  103. //GET /
  104. for(int i = 0; i < 4; i++)
  105. previousChars[i] = previousChars[i+1];
  106. previousChars[4] = c;
  107. if(strcmp("GET /", previousChars) == 0) {
  108. gettingUrl = true;
  109. }
  112. currentLineIsBlank = false;
  113. }
  114. }
  115. }
  116. // give the web browser time to receive the data
  117. delay(1);
  118. // close the connection:
  119. client.stop();
  120. }
  121. }