Friday, 22 July 2011

SIRC Part II - Arduino

More Parameters:
  Frame Timing:
             The signal to be transmitted is encoded to a form known as a "Frame", which represent 13 bits including start bit. Each bit in the frame is a combination of high and low voltage levels (high followed by low). The pulse-width of each type of bit is listed below:
        Pulse-Width: T = 0.6ms
        Start Bit: (2.4 + 0.6) ms = 3 ms = 5T
        '0' Bit: (0.6 + 0.6) ms = 1.2 ms = 2T
        '1' Bit: (1.2 + 0.6) ms = 1.8 ms = 3T
  Repeat Rate:
            Each frame is repeated atleast 3 times during transmission at an interval of 45 ms.
 What next?
           We have necessary data to start our project. We'll do the following tasks to gain practical experience on this:
                 * Develop an algorithm for encoding the signal to be transmitted.
                 * Produce the encoded signal with the help of a micro-controller.
                 * Transmit the signal through an IR LED in the form of IR.
                 * Recieve the signal using an IR TSOP receiver.
                 * Develop an algorithm for decoding the encoded signal.
                 * Display decoded data on the monitor.

A Platform to Move on: Arduino, a stable, famous and easy-to-understand Platform.  
      What is Arduino?
                   Arduino is a prototyping platform(AVR uC with some generic circuitry) with its own Software Development IDE(Arduino). We dont study much about Arduino here. Instead, We just use it as a tool to test our knowlege. The pictoral representation of Arduino Duemilanove is given below:
         The above figure will give you a good idea about the board. Either Atmega 168 or Atmega 328 can be used along with this board. It has 14(0 - 13) digital pins and 6(14 - 19) analog pins. We use one of those to produce the required signal. We connect an IR LED to that pin and convert the signal into IR form.
To know more about the features of Arduino Duemilanove, Click here.

Arduino IDE:
          Arduino software is one of most user-friendly software built so far. The programs created using this IDE are called as "Sketches". General structure of sketch is

//beggining of sketch
//global declarations goes here
//function definitions also goes here
void setup()
     // here initial settings are done.
     // This function is executed only once
void loop()
     // here exact set of instructions are written, which will be performed again
     // and again by the controller
//end of sketch

All the standard functions to be used can be studied from the following link: Click Here....
Coming up next:
       * Encoding and Decoding codes
       * Practical model
       * Building a project ( An Universal Remote)


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