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Bi-directional communication from touchOSC to Arduino using an ethernet shield.

In this version, the Macbook is directly connected to the Arduino to provide a serial monitor for status updates. 

How it works: press a toggle, or move a fader, in touchOSC – it sends a message to the Arduino which lights up, or fades, an LED – then sends back an OSC message to touchOSC to light up the toggle button. (note: local feedback should be off for the toggle button in touchOSC. This is the default)

Arduino circuit

• Use an ethernet shield. 
• Connect ethernet cable. (I am using a Netgear WNCE2001 ethernet to wiFi adapter)
• LED is connected to pin 5 and ground. The shorter lead connects to ground.

Instructions

1. Connect Arduino to Macbook via USB.
2. Open the Arduino serial monitor to initialize the ethernet connection and display the IP address.

touchOSC

1. In touchOSC or Max, set the target IP to the one just displayed in the Arduino serial monitor
2. From touchOSC (or Max) send on port 8000, receive on port 9000.
3. Use the default touchOSC layout (simple)
4. Use /fader1 and /toggle1 to control the LED

Max

1. Open arduino-osc-ethernet1.maxpat
2. Set ip address in [udpsend] to the one just displayed in the Arduino serial monitor
3. Have some fun

Fixed IP address

update 1/2016: A version of the Arduino sketch that uses a fixed IP instead of DHCP is located in the folder: OSC_ethernet_fixedIP/

The IP is set to 192.168.1.177 but you can change it to any valid address on your network.

Arduino sketch

// generic Arduino OSC program 
// works from Max or touchOSC
//
// plug LED into pin 5 (and gnd)
//
// requires ethernet shield
//
// use serial monitor to get the ip address
//
// use these OSC commands (will work from first page of touchOSC simple layout
//
// /1/fader1
// /1/toggle1
//

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

byte mac[] = { 0x90, 0xA2, 0xDA, 0x0D, 0x0B, 0xCE }; //physical mac address

OSCServer server;
OSCClient client;

int serverPort = 8000; //Touch OSC Port (outgoing)
int destPort = 9000; //Touch OSC Port (incoming)
int ledPin = 5; 
int flag=0;

void setup(){

pinMode(2, OUTPUT);
 Serial.begin(9600); 
 Serial.println("DNS and DHCP-based OSC server");
 // start the Ethernet connection:
 if (Ethernet.begin(mac) == 0) {
 Serial.println("Failed to configure Ethernet using DHCP");
 // no point in carrying on, so do nothing forevermore:
 while(true);
 }
 // print your local IP address:
 Serial.print("Arduino IP address: ");
 for (byte thisByte = 0; thisByte < 4; thisByte++) {
 // print the value of each byte of the IP address:
 Serial.print(Ethernet.localIP()[thisByte], DEC);
 Serial.print("."); 
 }
 Serial.println();
 Serial.println();

//start the OSCserver
 server.begin(serverPort);

//add OSC callback function. One function is needed for every TouchOSC interface element that is to send/receive OSC commands.
 server.addCallback("/1/toggle1", &funcOnOff);
 server.addCallback("/1/fader1", &funcFader);
}

void loop(){

if(server.aviableCheck()>0){
 // Serial.println("alive! ");
 } 
}

//When the button on the TouchOSC inteface is pressed, a message is sent from the iDevice
//to the Arduino to switch (togle) the LED on the Arduino on/off
//then a messeage is sent bak from the Arduino to the iDevice to toggle the buttom on/off

void funcOnOff(OSCMessage *_mes){
 float value = _mes->getArgFloat(0); //TouchOSC expects float values

//create new osc message
 OSCMessage newMes;

//set destination ip address & port no
 newMes.setAddress(_mes->getIpAddress(),destPort);
 newMes.beginMessage("/1/toggle1");

Serial.println(value);
 if(value < 1.0) {
 digitalWrite(ledPin, LOW);
 }
 else{
 digitalWrite(ledPin, HIGH);
 }

newMes.addArgFloat(value);

//send osc message
 //
 // turn local feedback off on touch-osc control to test this
 client.send(&newMes);

}

// new callback for fader - using same comments
//When the button on the TouchOSC inteface is pressed, a message is sent from the iDevice
//to the Arduino to switch (togle) the LED on the Arduino on/off
//then a messeage is sent bak from the Arduino to the iDevice to toggle the buttom on/off

void funcFader(OSCMessage *_mes){
 float value = _mes->getArgFloat(0); //TouchOSC expects float values

//create new osc message
 OSCMessage newMes;

//set destination ip address & port no
 newMes.setAddress(_mes->getIpAddress(),destPort);
 newMes.beginMessage("/1/fader1");

Serial.println(value);
 int ledValue = value * 255.0;
 analogWrite(ledPin, ledValue);

newMes.addArgFloat(value);

//send osc message
 //
 // turn local feedback off on touch-osc control to test this
 client.send(&newMes);

}