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Currently I'm trying to write a sketch that decodes the signal of the iTead intelligent switch, without not much luck. I  have the documentation, but I don't know how to filter the OOK signal...
http://blog.iteadstudio.com/itead-intelligent-switch-433mhz-communication-protocol/
Any idea?
(Of course, the sketch that iTead shared, not working...)
Thanks,

Zsolt

[Reply #1 on:]

Let me answer my own question... 
It works!

Here's the code you can use. I have a Mega, so for other boards slight modifications will  be needed...

Code:

/*
Switch example for the iTead intelligent switch
Details about the protocol can be found here: http://blog.iteadstudio.com/itead-intelligent-switch-433mhz-communication-protocol/
DON'T FORGET, IF YOU WANT TO RECEIVE THE ID FROM THE SWITCH, CONNECT THE 433MHz RECEIVER TO INTERRUPT 2 THIS IS PIN21 ON THE ARDUINO MEGA
YOU CAN CHANGE THE INTERRUPT PIN IN THE SWITCH LIBRARY IN Switch.cpp
You can grab the library from here: http://blog.iteadstudio.com/itead-intelligent-switch-protocol-library-for-arduino/


Commands are in Hexadecimal, but the "switchit" using decimal codes.

Valid commands to send:
Control ON: 0×02 + 24-bit IDKEY
Control Off: 0×03 + 24-bit IDKEY
Control reverse status: 0×01 + 24 IDKEY
Request pairing command: 0×40000000      //not implemented in this code but easy to do if needed
ON status: 0×06 + 24-bit IDKEY           
OFF status: 0×07 + 24-bit IDKEY
Successful pairing command: 0×50 + 24-bit IDKEY // Decimal: 80

YOU ARE FREE TO USE THE CODE WITH OR WITHOUT ANY MODIFICATION
Author: Zsolt Reinhardt
*/

#include <Switch.h> // using Itead's library for receiving packets

byte bytea;
byte byteb;
byte bytec;
byte mask = 1;
int sendbit[8];
int tx_pin=10;  //PIN where the 433Mhz OOK transmitter connected

void setup() {
  Switch.Init(115200);
  pinMode(tx_pin,OUTPUT);
  digitalWrite(tx_pin,LOW);
  Serial.begin(115200);
  Serial.println("Started...");
}

void loop() {
  delay(10000); // Have some 10sec delay between status change
  switchit(1,00,39,19);  // This example sending a reverse status command to switch 003919 (decimal) ID.

// Code below is to receive the switch's ID for Arduino Mega connect the data pin of the 433MHz receiver module to PIN21
// In case you need to have the code of your switch, comment it out.

/*      // Beginning of switch ID Reader code
while(1)
{
if(Switch.Available())
{
unsigned char value = Switch.Read();
                Serial.print("Hex: ");
Serial.println(value,HEX);
                Serial.print("Dec: ");
                Serial.println(value,DEC);
                Serial.println();
}
  }


*/     // End of switch ID Reader code
}

void sendleadercode()
{
digitalWrite(tx_pin,HIGH);
delayMicroseconds(380);
digitalWrite(tx_pin,LOW);
delayMicroseconds(9920);
}

void sethigh()
{
         
digitalWrite(tx_pin,HIGH);
delayMicroseconds(380);  //Can be adjusted to be more precise
digitalWrite(tx_pin,LOW);
delayMicroseconds(1090);   //Can be adjusted to be more precise     
}
void setlow()
{
digitalWrite(tx_pin,HIGH);
delayMicroseconds(380);   //Can be adjusted to be more precise
digitalWrite(tx_pin,LOW);
delayMicroseconds(340);   //Can be adjusted to be more precise
}


void switchit(int command, byte bytea, byte byteb, byte bytec){
  Serial.print("Sending command: ");
  Serial.println(command);
  Serial.print("Sending to: ");
  Serial.print(bytea,HEX);
  Serial.print(" ");
  Serial.print(byteb,HEX);
  Serial.print(" ");
  Serial.print(bytec,HEX);
  Serial.print(" ");
  Serial.println();
  for(int i=0;i<8;i++){
  sendleadercode();
  sendbyte(command);
  sendbyte(bytea);
  sendbyte(byteb);
  sendbyte(bytec);
  }
}
 

void sendbyte(byte tosend){
  int b=7;
  for (mask = 00000001; mask>0; mask <<= 1) { //iterate through bit mask
    if (tosend & mask){ // if bitwise AND resolves to true
      sendbit[b]=1;
    }
    else{
            sendbit[b]=0;
    }
    --b;
  }
  for(int i=0;i<8;i++){
    if(sendbit[i]==0){
      setlow();
  } else {
    sethigh();
    }
  }
 }