Using TSOP4836 for reading codes with IR microcontroller PIC18F2520

Probably many of the fans of development on microcontrollers least a couple of times but the thought of the possibility of the control device using a standard IR remote control from the TV. Particularly captivating is that to connect the IR sensor TSOP4836 required just simply one free pin and two resistors! Once I tried this option.

I picked a simple circuit on 18F2520 and figured out how to decode the signals and wrote the code, with which got signatures for all available to me at the moment IR remotes.

The following is the source code, with which you can get 32-bit signatures for different buttons on the remote:

#include <18f2520.h>

#define FCONST OSC_8MHZ 
#define FREQ 8000000

#pragma config WDT = OFF
#pragma config LVP = OFF
#fuses INTRC_IO
#use delay (clock=FREQ)
#use rs232(baud=9600, xmit=PIN_A2,rcv=PIN_A3)

#define LED          PIN_A0

INT1  Received=false;
long t;
int8 i;

#define LH_Edge 0
#define HL_Edge 1
int8 edge;
void setEdge(int1 e) {
  edge=e;
  if (e==LH_Edge) {
    ext_int_edge(0, L_TO_H);
  } else {
    ext_int_edge(0, H_TO_L);
  }
}

int32 t0,t1;
int32 code;
int8 timerov;
int8 cnt=0xFF;

#define MIN_LEAD_IN 1000      // 4 ms 
#define MAX_LEAD_IN 1500      // 6 ms
#define MIN_TIME 60           // 0.24 ms 
#define MID_TIME 200          // 0.8 ms 
#define MAX_TIME 800          // 3.2 ms

#int_EXT

EXT_isr() {
  if (!received) {
    if (edge==HL_Edge) {
      t1=(0x10000*timerov+get_timer0());
    } else {
      t0=(0x10000*timerov+get_timer0());

      if (cnt==0xFF) {
        if ((t1>MIN_LEAD_IN)&&(t1<MAX_LEAD_IN)) {
          cnt=0;
          code=0;
        }
      } else {
        if ((t1<MAX_TIME)&&(t1>MIN_TIME)&&(t0>MIN_TIME)&&(t0<MAX_TIME)) {
          if ((t1<MID_TIME)&&(t0<MID_TIME)) {
          } else {
            bit_set(code,cnt);
          }

          cnt++;        
        } else {
          cnt=0xFF;        
        }
      }    
      if (cnt==23) {
        received=TRUE;
        cnt=0xFF;
      }    
    }
  }
  setEdge(!edge);
  timerov=0;
  set_timer0(0);
}

#int_TIMER0
TIMER0_isr() {
  if (timerov<255)
    timerov++;
}

void main()
{
  setup_oscillator(FCONST);
   delay_ms(5000);
   printf("initr");

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_spi(FALSE);
   setup_wdt(WDT_OFF);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_8);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   enable_interrupts(INT_EXT);
   enable_interrupts(GLOBAL);
   enable_interrupts(INT_TIMER0);
   setEdge(HL_Edge);

   set_timer0(0);
   delay_ms(10);
   t=get_timer0();
   printf("%Lu",t);
   printf("00 tick/sec");

   printf("gor");
   DO
   {
   IF (received) {
     disable_interrupts(GLOBAL);
     printf("%lx ",code); 
     printf("r");
     enable_interrupts(GLOBAL);
     received=false;
   }
   }
   WHILE (true);
}

The following is a table of IR codes for the studied home consoles. The codes in the table are arranged visually in accordance with the arrangement of buttons on the remote.

Remote Code Table “TOSHIBA CT-90119”

	0016bf40		0012bf40
	0013bf40	0017bf40	0010bf40
	0001bf40	0002bf40	0003bf40
	0004bf40	0005bf40	0006bf40
	0007bf40	0008bf40	0009bf40
	000bbf40	0000bf40	0014bf40
		001bbf40
	001ebf40		001abf40
		001fbf40
	005bbf40	0018bf40	001cbf40
	0053bf40	0054bf40	000dbf40
	0048bf40	0015bf40	004bbf40
	0049bf40		004abf40

Remote Code Table “Twinhan-DVB”

	004dff00		0016ff00
	0003ff00	0001ff00	0006ff00
	0009ff00	001dff00	001fff00
	000dff00	0019ff00	001bff00
	0011ff00	0015ff00	0017ff00
	0040ff00	0005ff00	0012ff00
	000aff00	0014ff00	001eff00
	000eff00	0002ff00	001aff00
	004cff00	0010ff00	000cff00
	0054ff00	0048ff00	001cff00
	0004ff00	0000ff00	000fff00

Code Table for Remote ORION-DVD

	0054bf40			005bbf40
	0014bf40	0057bf40	0041bf40	0046bf40
	0009bf40	001dbf40	001fbf40	000dbf40
	0019bf40	001bbf40	0011bf40	0015bf40
	0017bf40	0012bf40	0059bf40	0008bf40
	0050bf40	0055bf40	0048bf40	004abf40
	005ebf40	0006bf40	0005bf40	0003bf40
	0047bf40	0007bf40	0040bf40	0002bf40
	0018bf40	0044bf40	000fbf40	0051bf40
	000abf40	001ebf40	000ebf40	001abf40
	0053bf40	0052bf40	0001bf40	0045bf40

Table of codes for IR AVerMedia:

	0001fd02	0002fd02	0003fd02	0000fd02
	0005fd02	0006fd02	0007fd02	0004fd02
	0009fd02	000afd02	000bfd02	0008fd02
	000dfd02	000efd02	000ffd02	000cfd02
	0011fd02	0012fd02	0013fd02	0010fd02
	0015fd02	0016fd02	0017fd02	0014fd02
	0019fd02	001afd02	001bfd02	0018fd02
	001dfd02	001efd02	001ffd02	001cfd02
	0001fc03	0002fc03	0003fc03	0000fc03