IR Remote Control

prototype circuit:
single-button (single-function) mini-Remote Control for Sony TV




Hi-Tech C code:

 // Sony Remote Control  
 // 12-bit SIRC protocol  
 // Hi-Tech C code by yus
 // rev 1 Oct 28, 2008  
 #include <pic.h>  
 __CONFIG(XT & WDTDIS & PWRTEN & BORDIS & UNPROTECT);  
 #define irled PORTA               //IR-LED pin  
 #define irled_tris TRISA     //tri-state  
 //devices  
 #define tv                    1  
 #define     vcr1               2  
 #define     vcr2               3  
 #define     laser_disc_unit     6  
 #define     surround_sound     12  
 #define     cassette_deck     16  
 #define     cd_player          17  
 #define     equalizer          18  
 //functions  
 #define     key_1               0  
 #define     key_2               1  
 #define     key_3               2  
 #define     key_4               3  
 #define     key_5               4  
 #define     key_6               5  
 #define     key_7               6  
 #define     key_8               7  
 #define     key_9               8  
 #define     key_0               9  
 #define     channel_up          16  
 #define     channel_down     17  
 #define     volume_up          18  
 #define     volume_down          19  
 #define     mute               20  
 #define     power               21  
 #define     reset               22  
 #define     audio_mode          23  
 #define     contrast_up          24  
 #define     contrast_down     25  
 #define     colour_up          26  
 #define     colour_down          27  
 //#define channel_lock     28  
 #define     brightness_up     30  
 #define     brightness_down     31  
 //#define hue_down 32  
 //#define hue_up     33  
 //#define sharpness_up     34  
 //#define sharpness_down 35  
 //#define recall          36  
 //#define tv_video          37  
 #define     balance_left     38  
 #define     balance_right     39  
 //#define equalizer          40  
 //#define surround          41  
 #define     standby               47  
 void burst(unsigned int pulses)  
 {  
      do     //~40kHz, 1/3 duty cycle  
      {  
           irled = 0xff;  
           NOP();     NOP();     NOP();  
           NOP();     NOP();     NOP();     //@4MHz xtal  
           irled = 0x00;  
           NOP();     NOP();     NOP();  
           NOP();     NOP();     NOP();  
      }while(--pulses);  
 }  
 void space(unsigned int interval)  
 {  
      do{  
           NOP();     NOP();     NOP();  
           NOP();     NOP();     NOP();  
           NOP();     NOP();     NOP();  
           NOP();     NOP();  
      }while(--interval);  
 }  
 void remote_control(unsigned int function, unsigned int device)     //~45ms frame  
 {  
      unsigned int i, time;  
      burst(96);     //header  
      space(24);  
      time = 10;     // count the time duration  
      for(i=0; i<7; i++)     //7-bit command/funtion  
      {     //LSB first  
           if(function&(1<<i))  
           {  
                burst(48);     space(24);     //logic "1"  
                time = time + 6;          //increment counter  
           }  
           else  
           {  
                burst(24);     space(24);     //logic "0"  
                time = time + 4;          //increment counter  
           }  
      }  
      for(i=0; i<5; i++)     //5-bit address (device address)  
      {     //LSB first  
           if(device&(1<<i))  
           {  
                burst(48);     space(24);     //logic "1"  
                time = time + 6;          //increment counter  
           }  
           else  
           {  
                burst(24);     space(24);     //logic "0"  
                time = time + 4;          //increment counter  
           }  
      }  
      space((150-time)*12);     // blanking time, complete the 45ms frame   
 }  
 //sample main function  
 void main()  
 {  
      irled_tris = 0x00; //as output pin  
      irled = 0x00;     // initial state  
      while(1)  
      {  
           remote_control(power,tv);     // power on/off a TV set  
           //burst(255);  
      }  
 }  

*tested only with Sony Trinitron (model#: KV-SW212N50)