How to exchange data between arduino nano and Ethernet Shield Module(For Arduino UNO MEGA)?

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GeekFromUa2014-11-26 20:17:44

Arduino

GeekFromUa, 2014-11-26 20:17:44

Hello. I want to run a web server on arduino. How to correctly, and in general, you can connect arduino and this is the ethernet module in the picture. Because somewhere I read that it is only for arduino MEGA and UNO.

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2 answer(s)

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Dremkin, 2014-11-26
@Dremkin

forum.arduino.cc/index.php?topic=16325.0
Nano - Ethernet Sheild
---
TX1 - D1
RX0 - D0
D10 - D10
D11 - D11
D12 - D12
D13 - D13
REF - AREF
5V - 5V
GND - GND
D2 - RESET (see sketch above)
---

P

papkinv, 2014-11-26
@papkinv

I did this:
The shield is connected to the arduino mega 2560. I don’t consider it expedient to connect to simpler ones - pages and images require a lot of memory, which is about 256K in MEGA.
sketch (gives html if the address is ip-addres or json if the request is for ip-addres/data, it's easy to attach other data, up to pictures, etc.)

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

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 1, 177);

float data[2];
uint8_t buflen = 8;

const int receive_pin = 2;

String htmlContentType = "text/html";
String jsonContentType = "application/json";

const char html[] PROGMEM = "<!DOCTYPE html>\r\n"
"<html>\r\n"
"<head>\r\n"
"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\r\n"
"</head>\r\n"
"<body>\r\n"
"</body>\r\n"
"</html>\r\n";

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);

  // start the Ethernet connection and the server:
  Ethernet.begin(mac, ip);
  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());  
}

void respondPage(EthernetClient client, const prog_char page[])
{
  char c;
  while((c = pgm_read_byte(page++)))
    client.write(c);
}

void responseHeader(EthernetClient client, String contentType) {
  client.println("HTTP/1.1 200 OK");
  client.print("Content-Type: ");
  client.println(contentType);
  client.println("Connection: close");
  client.println();
}

String readURL(EthernetClient client) {
  if(client.find("GET /")) {
    String URL = client.readStringUntil(' ');
    while(client.available()) 
      client.read();
    return URL;
  }
  return "&nothing";
}

void loop() {
  EthernetClient client = server.available();
  if (client) {
    Serial.println("new client");
    while (client.connected()) {
      if (client.available()) {
          String URL = readURL(client);
          Serial.println("'"+URL+"'");
          if (URL == "") {
            responseHeader(client, htmlContentType);
            respondPage(client, html);
          }
          else if (URL == "data") {
            responseHeader(client, jsonContentType);
            client.print("[1,1]");            
          }
          break;
      }
    }
    delay(1);
    client.stop();
    Serial.println("disconnected");    
  }
}