Ethernet Shield blocking my serial read

Projects Programming
1

Hello! I have an RFID reader and some code that works just fine when my arduino doesn't have a shield on it. But I want to send that data to a server, so a-shielding I must go.

Problem: When I put my ethernet shield on my arduino while running this code, the serial monitor stops returning anything

Suggestions? Is there a fundamental concept I am missing? Some pins I've got mixed up, maybe? The sample ethernet shield webclient example works just fine.

Any help's appreciated, thank you!

/* Crazy People
 * By Mike Cook April 2009
 * Three RFID readers outputing 26 bit Wiegand code to pins:-
 * Reader A (Head) Pins 2 & 3
 * Interrupt service routine gathers Wiegand pulses (zero or one) until 26 have been recieved
 * Then a sting is sent to processing
 */

volatile long reader1 = 0;
volatile int reader1Count = 0;

void reader1One(void) {
  reader1Count++;
  reader1 = reader1 << 1;
  reader1 |= 1;
}

void reader1Zero(void) {
  reader1Count++;
  reader1 = reader1 << 1;
}

void setup()
{
  Serial.begin(9600);
  // Attach pin change interrupt service routines from the Wiegand RFID readers
  attachInterrupt(0, reader1Zero, RISING);//DATA0 to pin 2
  attachInterrupt(1, reader1One, RISING); //DATA1 to pin 3
  delay(10);
  // the interrupt in the Atmel processor mises out the first negitave pulse as the inputs are already high,
  // so this gives a pulse to each reader input line to get the interrupts working properly.
  // Then clear out the reader variables.
  // The readers are open collector sitting normally at a one so this is OK
  for(int i = 2; i<4; i++){
  pinMode(i, OUTPUT);
   digitalWrite(i, HIGH); // enable internal pull up causing a one
  digitalWrite(i, LOW); // disable internal pull up causing zero and thus an interrupt
  pinMode(i, INPUT);
  digitalWrite(i, HIGH); // enable internal pull up
  }
  delay(10);
  // put the reader input variables to zero
  reader1 = 0;
  reader1Count = 0;
  //digitalWrite(13, HIGH);  // show Arduino has finished initilisation
}

void loop() {
  if(reader1Count >=26){
//Serial.print(" Reader 1 ");
//Serial.println(reader1,HEX);
 // Serial.println("A");
 //Serial.println(reader1& 0xfffffff);
 int serialNumber=(reader1 >> 1) & 0x3fff;
 int siteCode= (reader1 >> 17) & 0x3ff;

 Serial.print(siteCode);
// Serial.print("  ");
 Serial.println(serialNumber);
  reader1 = 0;
  reader1Count = 0;
  digitalWrite(13,HIGH);
  delay(2000);
  digitalWrite(13,LOW);
     }
}
2

Which e-net shield?

Mark

3

Some knock-off cheap quality ethernet shields have been known to load down pins 0 and 1, which are used for serial communication.

4

Web client code that takes serial input.

//zoomkat 9-22-12
//simple client test
//for use with IDE 1.0.1
//with DNS, DHCP, and Host
//open serial monitor and send an e to test
//for use with W5100 based ethernet shields
//remove SD card if inserted

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

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address

char serverName[] = "web.comporium.net"; // zoomkat's test web page server
EthernetClient client;

//////////////////////

void setup(){

  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    while(true);
  }

  Serial.begin(9600); 
  Serial.println("Better client test 9/22/12"); // so I can keep track of what is loaded
  Serial.println("Send an e in serial monitor to test"); // what to do to test
}

void loop(){
  // check for serial input
  if (Serial.available() > 0) //if something in serial buffer
  {
    byte inChar; // sets inChar as a byte
    inChar = Serial.read(); //gets byte from buffer
    if(inChar == 'e') // checks to see byte is an e
    {
      sendGET(); // call sendGET function below when byte is an e
    }
  }  
} 

//////////////////////////

void sendGET() //client function to send/receive GET request data.
{
  if (client.connect(serverName, 80)) {  //starts client connection, checks for connection
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.0"); //download text
    client.println("Host: web.comporium.net");
    client.println(); //end of get request
  } 
  else {
    Serial.println("connection failed"); //error message if no client connect
    Serial.println();
  }

  while(client.connected() && !client.available()) delay(1); //waits for data
  while (client.connected() || client.available()) { //connected or data available
    char c = client.read(); //gets byte from ethernet buffer
    Serial.print(c); //prints byte to serial monitor 
  }

  Serial.println();
  Serial.println("disconnecting.");
  Serial.println("==================");
  Serial.println();
  client.stop(); //stop client

}
5

I hope it's not a shoddy shield, haha.

It's this one

I'll try that sample code this afternoon, thanks!

6

Zoomkat, it works like a charm and is an awesome debug. The eventual goal is to pass something from a sensor to a URI in a get request. So this is a good first step. thanks!

zoomkat:
Web client code that takes serial input.

//zoomkat 9-22-12

//simple client test
//for use with IDE 1.0.1
//with DNS, DHCP, and Host
//open serial monitor and send an e to test
//for use with W5100 based ethernet shields
//remove SD card if inserted

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

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address

char serverName[] = "web.comporium.net"; // zoomkat's test web page server
EthernetClient client;

//////////////////////

void setup(){

if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    while(true);
  }

Serial.begin(9600);
  Serial.println("Better client test 9/22/12"); // so I can keep track of what is loaded
  Serial.println("Send an e in serial monitor to test"); // what to do to test
}

void loop(){
  // check for serial input
  if (Serial.available() > 0) //if something in serial buffer
  {
    byte inChar; // sets inChar as a byte
    inChar = Serial.read(); //gets byte from buffer
    if(inChar == 'e') // checks to see byte is an e
    {
      sendGET(); // call sendGET function below when byte is an e
    }
  } 
}

//////////////////////////

void sendGET() //client function to send/receive GET request data.
{
  if (client.connect(serverName, 80)) {  //starts client connection, checks for connection
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.0"); //download text
    client.println("Host: web.comporium.net");
    client.println(); //end of get request
  }
  else {
    Serial.println("connection failed"); //error message if no client connect
    Serial.println();
  }

while(client.connected() && !client.available()) delay(1); //waits for data
  while (client.connected() || client.available()) { //connected or data available
    char c = client.read(); //gets byte from ethernet buffer
    Serial.print(c); //prints byte to serial monitor
  }

Serial.println();
  Serial.println("disconnecting.");
  Serial.println("==================");
  Serial.println();
  client.stop(); //stop client

}