Bi-directional communication over ethernet.

Using Arduino Networking, Protocols, and Devices
3

I have the Arduino Ethernet Shield R3. I'm not where I can test this again but I believe this was the last version of the code that I had working with the xbee radios & shields.

Serial Catchers Relay shield side

unsigned char relayPin[4] = {4,5,6,7};

#define LED 13   // the pin for the LED
#define Input1 8 // the input pin where the
                 // pushbutton is connected
int valIn = 0;     // val will be used to store the state
                 // of the input pin 

void setup() {
Serial.begin(9600);
pinMode(LED, OUTPUT);
pinMode(Input1, INPUT);
pinMode(relayPin[0],OUTPUT);
pinMode(relayPin[1],OUTPUT);
pinMode(relayPin[2],OUTPUT);
pinMode(relayPin[3],OUTPUT);
}

void loop() {
  if (Serial.available()) {
    byte val = Serial.read(); // this will read from the xbee
    if (val == 'x') {
      digitalWrite(relayPin[3],HIGH);
      delay(1000);
      digitalWrite(relayPin[3],LOW);
    }
  
    if (val == 'c') {
      digitalWrite(relayPin[2],HIGH);
      delay(1000);
      digitalWrite(relayPin[2],LOW);
    }
  
    if (val == 'v') {
      digitalWrite(relayPin[1],HIGH);
      digitalWrite(relayPin[0],HIGH);
      delay(1000);
      digitalWrite(relayPin[1],LOW);
      digitalWrite(relayPin[0],LOW);
    }
  }
  valIn = digitalRead(Input1); // read input value and store it
  
  // check whether the input is HIGH (button pressed)
  if (valIn == HIGH) { 
    digitalWrite(LED, HIGH); // turn LED ON
    Serial.print('l'); //send back to the Pitcher
  } else {
    digitalWrite(LED, LOW);
    Serial.print('k'); //send back to the Pitcher
  }
}

Serial Pitcher Push Button

#define LED1 12   // the pin for the open LED
#define LED2 11   // the pin for the closed LED
#define BUTTON1 7 // the input pin where the
                 // pushbutton is connected
#define BUTTON2 8 // the input pin where the
                 // pushbutton is connected
#define BUTTON3 9 // the input pin where the
                 // pushbutton is connected
int val = 0;     // val will be used to store the state
                 // of the input pin 


void setup() {
Serial.begin(9600);
pinMode(LED1, OUTPUT);   // tell Arduino LED is an output
pinMode(LED2, OUTPUT);   // tell Arduino LED is an output
pinMode(BUTTON1, INPUT); // and BUTTON is an input
pinMode(BUTTON2, INPUT); // and BUTTON is an input
pinMode(BUTTON3, INPUT); // and BUTTON is an input
}

void loop() {
  if (Serial.available()) {
    byte valR = Serial.read(); // this will read from the xbee
    if (valR == 'l') {
      digitalWrite(LED1, HIGH); // turn LED ON
      digitalWrite(LED2, LOW); // turn LED OFF
      }
    if (valR == 'k') {
      digitalWrite(LED2, HIGH); // turn LED ON
      digitalWrite(LED1, LOW); // turn LED OFF
      }
    }
  
  val = digitalRead(BUTTON1); // read input value and store it

  // check whether the input is HIGH (button pressed)
  if (val == HIGH) { 
    Serial.print('x'); // send the value x to catcher 
    delay(500);
    }
  val = digitalRead(BUTTON2); // read input value and store it

  // check whether the input is HIGH (button pressed)
  if (val == HIGH) { 
    Serial.print('c'); // send the value c to catcher 
    delay(500);
    }
  val = digitalRead(BUTTON3); // read input value and store it

  // check whether the input is HIGH (button pressed)
  if (val == HIGH) { 
    Serial.print('v'); // send the value v to catcher 
    delay(500);
    }
}