Ethernet multi-function Interface
Using an Arduino Ethernet board, you can send IR codes to your TV or BD
With the same board, you can also interface to the Serial Console.
Contents
[hide]What you can do
- Send IR codes to your TV, PVR or BD, with an URL in your browser
- Use telnet to have the Serial Console on your PC or smartphone
Bill of materials
- Arduino Ethernet board (see Arduino)
Alternatively, an Arduino Uno with an Ethernet shield could also be used
- IR led (SFH4510 for example)
- 220 ohms resistor to limit current in the IR led
- If you plan to use the telnet interface to the Serial Console, make sure you have a 100 ohms resistor on both RX and TX signals (Arduino TX/RX are 5v !)
How to use it
- Upload the following sketch into your Arduino
- Connect the IR led with its resistor on pin 8 on the Arduino
- Connect power and network
- Find the IP address of the board on your DHCP (or use the static IP embedded in the sketch if you don't have DHCP)
- Use your browser to send an URL to the board (see format below)
- If you want to use telnet to connect to the Serial Console :
- Connect your Serial Console signals to RX/TX on the Arduino board (with 100 ohms resistors)
- Use Putty with options 'Local Echo' and 'Local line editing' forced to OFF
URL format to send IR codes
The format is http://IP/ir.htm?data=XX&type=Y&device=ZZZZ where
- IP is the Arduino board IP address
- XX is the IR code to send
- Y is 0 for TV/PVR frame format and 1 for BD frame format
- ZZZZ is the device code (0707 for TV, 0505 for PVR, 301A for BD)
The IR codes are listed at Key codes
- For TV/PVR, use the 'code' column
- For BD, use the 'BD-IR code' column
Examples
To get the Service Menu on your TV, use the 2 following URLs :
Please note that you cannot send KEY_FACTORY to a BD, as the corresponding code is not know yet
To have a kind of Wake Up on LAN on your BD player, use
To switch to channel 1 :
- On a TV : http://IP/ir.htm?data=65&type=0&device=0707
- On a BD : http://IP/ir.htm?data=81&type=0&device=301A
IR frames format
BD players use a modified IR frame format that TV and PVR. The reason is that samsung increased the data field length from 8 to 12 bits The general format is now :
- Start bit
- Device ID (16 bits - 0707 for TV, 301A for BD)
- For BD only : Stop bit and data MSB on 4 bits
- Data LSB
- Data LSB 1's complement
A frame for BD :
Arduino sketch
// ---------------------------------------------------------------------
// Samsung IR and Serial Console Ethernet Interface
// 29-06-2012 / Initial version / oga83
//----------------------------------------------------------------------
#include <SPI.h>
#include <Ethernet.h>
#define IRPIN 8 // IR led is connected on pin 8
#define LEDPIN 9 // Onboard led - blink at 2 Hz
byte mac[] = { 0x90, 0xA2, 0xda, 0x00, 0xe6, 0x5e }; // Arduino Ethernet board MAC address
IPAddress ip(192,168,1,178); // Default static IP if no DHCP
EthernetServer HttpServer(80); // HTTP is used to send IR commands
EthernetServer TelnetServer(23); // Telnet is used for Serial Console
// Convert a hex string to unsigned int
unsigned int HexToUInt(char *s)
{
unsigned u=0;
while (*s)
{
char c=*s++;
// Convert to uppercase
if (c>='a') c&=0xdf;
// Exit if not hex digit
if ((c<'0' || c>'9') && (c<'A' || c>'F')) break;
// Convert digit
u<<=4;
u|=c-((c>'9') ? 'A'-0xa:'0');
}
return u;
}
// ---------------------------------------------------------------------
// Samsung IR class
// ---------------------------------------------------------------------
class Samsung
{
private:
// Send a 36kHz-modulated pulse
static void Pulse(void)
{
byte i;
for (i=0; i<21; i++)
{
digitalWrite(IRPIN, HIGH);
delayMicroseconds(10); // Value adjusted with oscilloscope
digitalWrite(IRPIN, LOW);
delayMicroseconds(10); // Value adjusted with oscilloscope
}
}
// Send a bit
static void SendIRBit(byte b)
{
Pulse();
if (b)
delayMicroseconds(1390);
else
delayMicroseconds(430);
}
// Send 4 bits
static void SendIRNibble(byte b)
{
byte i;
for (i=0; i<4; i++)
SendIRBit((b>>i)&1);
}
// Send a byte
static void SendIRByte(byte b)
{
byte i;
for (i=0; i<8; i++)
SendIRBit((b>>i)&1);
}
public:
// Send an IR command
// Type is 0 for TV, 1 for BD
// Device is 0x0707 for TV, 0x301A for BD
static void SendCommand(char Type, unsigned int Device, unsigned int Command)
{
byte i;
// Disable interrupts
cli();
// Start bit
for (i=0; i<8; i++) Pulse();
delayMicroseconds(4500);
// Send Device Id
SendIRByte(Device>>8);
SendIRByte(Device&0xff);
// BD Player
if (Type==1)
{
// Stop bit
Pulse();
delayMicroseconds(4500);
// Send Data
SendIRNibble(Command>>8);
}
SendIRByte(Command);
SendIRByte(~Command);
// Stop bit
Pulse();
delayMicroseconds(4500);
// Re-enable interrupts
sei();
}
};
// ---------------------------------------------------------------------
// Initialization
// ---------------------------------------------------------------------
void setup()
{
// Led
pinMode(LEDPIN, OUTPUT);
digitalWrite(LEDPIN, HIGH);
// IR Led
pinMode(IRPIN, OUTPUT);
digitalWrite(IRPIN, HIGH);
// Serial Console
Serial.begin(115200);
// Initialize Ethernet. Try DHCP, otherwise static IP
if (Ethernet.begin(mac)==0)
Ethernet.begin(mac, ip);
// Initialize HTTP server
HttpServer.begin();
// Initialize Telnet server
TelnetServer.begin();
}
// ---------------------------------------------------------------------
// Main Program
// ---------------------------------------------------------------------
char NetworkFrame[256]; // General buffer for frames
boolean iStateLed=false; // Used for led blinking
unsigned long timeLastLedMs=0; // Used for blinking delay
void loop()
{
// -------------------------------------------------
// LED blinks at 2Hz
// -------------------------------------------------
if (millis()>timeLastLedMs+250)
{
timeLastLedMs=millis();
digitalWrite(LEDPIN, (iStateLed) ? HIGH:LOW);
iStateLed=!iStateLed;
}
// -------------------------------------------------
// Handle HTTP requests
// Example :
// To send KEY_1 on BD :
// http://IP/ir.htm?data=81&type=1&device=301a
// -------------------------------------------------
EthernetClient client = HttpServer.available();
if (client)
{
char *ptr=NetworkFrame;
int n=0;
while (client.connected() && client.available())
{
if (n++<sizeof(NetworkFrame))
*ptr++=client.read();
else
client.flush();
}
*ptr=0;
if (n>0)
{
__FlashStringHelper *Header=F("HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n");
// -------------------------------------------------
// Samsung IR command
// -------------------------------------------------
ptr=strstr(NetworkFrame, "/ir.htm?data=");
if (ptr)
{
ptr+=13;
byte Type=0;
unsigned int Device=0x0707, Data=HexToUInt(ptr);
ptr=strstr(ptr, "type=");
if (ptr) Type=HexToUInt(ptr+5);
ptr=strstr(ptr, "device=");
if (ptr) Device=HexToUInt(ptr+7);
Samsung::SendCommand(Type, Device, Data);
client.println(Header);
client.println("OK !");
delay(100);
client.stop();
return;
}
// send an error !
client.println(Header);
client.println(F("Error !"));
delay(1);
}
client.stop();
}
// -------------------------------------------------
// Telnet Serial Console Interface
// Configure Putty with :
// - "Local Echo : Force off"
// - "Local line editing : Force off"
// -------------------------------------------------
client = TelnetServer.available();
if (client)
{
char *ptr=NetworkFrame;
int n=0;
while (client.connected() && client.available())
if (n++<sizeof(NetworkFrame)) *ptr++=client.read();
*ptr=0;
// Sends telnet buffer to Serial Console
if (n>0) Serial.write(NetworkFrame);
}
// Anything received from Serial Console ?
char *ptr=NetworkFrame;
int n=0;
while (Serial.available())
if (n++<sizeof(NetworkFrame)) *ptr++=Serial.read();
*ptr=0;
// Send it to telnet
if (n>0) TelnetServer.write(NetworkFrame);
}
// ---------------------------------------------------------------------
