IR Decoder...

koolguy

Active Member

• Sep 5, 2013

• #1

Hi,

Now I am working on IR decoder for remote control.
I have sen some Universal remote which accept all command of other remote and work as per there command, anyway i need to make control system using 877A to decode TV remote control signal can any remote will work?

 

Attachments

• 
  1.jpg

  4.1 KB · Views: 196

Nigel Goodwin

Super Moderator

Most Helpful Member

• Sep 6, 2013

• #2

My tutorials provide code for Sony SIRC's, but there are numerous different systems in use, all are simple to transmit, but much more complex to receive (Sony SIRC's is one of the easiest to receive). The most common type is Philips RC5, which is more difficult to receive as it uses Manchester coding.

 

koolguy

Active Member

• Sep 6, 2013

• #3

My tutorials provide code for Sony SIRC's, but there are numerous different systems in use, all are simple to transmit, but much more complex to receive (Sony SIRC's is one of the easiest to receive). The most common type is Philips RC5, which is more difficult to receive as it uses Manchester coding.

Click to expand...

OK, I have Philips, Chinese, DISHTV can we used it??
Please tell how to Decode ?

 

misterT

Well-Known Member

Most Helpful Member

• Sep 6, 2013

• #4

 

Last edited by a moderator: Sep 10, 2013

be80be

Well-Known Member

• Sep 6, 2013

• #5

Find you a cheap old sony tv remote. Dish tv has all kinds of encoding some are even wireless.

 

dr pepper

Well-Known Member

Most Helpful Member

• Sep 6, 2013

• #6

I have done this for RC5, I didnt find manchester code difficult, but my implementation doesnt use all the pulses it ignores the last pulse of the manchester code, still works well.
Multi purpose replacement remotes are good for this as they support more than one protocol.
Are you going C or asm?

P.S. I found the tssop devices like you show to be very sensitive to noise on the power line, I found a 470r and a 47uF cap on a little board I pulled from a tv powering its infra red receiver from 5v, I've done this ever since and its been fine even on bread board.

 

koolguy

Active Member

• Sep 6, 2013

• #7

Are you going C or asm?

Click to expand...

Off course C...

 

misterT

Well-Known Member

Most Helpful Member

• Sep 6, 2013

• #8

RITESH KAKKAR said:

Off course C...

Click to expand...

You got four posts with loads of info and that is your response?

Post some schematics.. what plans you have for the project so far. How are you going to proceed etc. If you watched the video, read the datasheet and if you have some plans, then I am very willing to help you with any issue you have trouble with. But, if you do not listen to any help that people give you and just wait for complete solution to "pop-up".. that is not going to work.

 

Last edited: Sep 6, 2013

dr pepper

Well-Known Member

Most Helpful Member

• Sep 7, 2013

• #9

Cant help you with C, my codes asm.

 

J

jjw

Member

• Sep 9, 2013

• #10

This link has about ten IR-protocols explained: https://www.sbprojects.com/knowledge/ir/index.php

 

koolguy

Active Member

• Sep 9, 2013

• #11

Yes i have seen that page before it show only theory/single page without any code to start working.

 

J

jjw

Member

• Sep 9, 2013

• #12

No, it is a multipage document, that has also info about PIC84 based decoder: hardware, software....
Look the menus on the front page.

And here software in C for PIC18Fxx: https://www.vecoven.com/elec/ir/ir.html

 

Last edited: Sep 9, 2013

misterT

Well-Known Member

Most Helpful Member

• Sep 9, 2013

• #13

RITESH KAKKAR said:

Yes i have seen that page before it show only theory

Click to expand...

Theory is what you need. Read it.

 

koolguy

Active Member

• Sep 19, 2013

• #14

OK, i have one question if i want to measure/compare time interval how to do this?
and i found this ready made..
**broken link removed**

 

georgetwo

Member

• Sep 19, 2013

• #15

RITESH KAKKAR said:

OK, i have one question if i want to measure/compare time interval how to do this?
and i found this ready made..
**broken link removed**

Click to expand...

The answer to your question is in the link JJW gave to you. there are also c codes there that will help you decode the IR data.
https://www.sbprojects.com/knowledge/ir/index.php
if you find the whole thing too complex, try studying the .h file and if you have all it takes, watch that video.

 

koolguy

Active Member

• Sep 22, 2013

• #16

The capture mode of PIC16F877a code: is this fine?

Code:

#include<pic.h>
#define _XTAL_FREQ 20000000L
__CONFIG(0x3F18);
unsigned char low,high;
void main (void){
TRISC2=1;
CCP1CON=0b00000101;//Capture mode, every rising edge
T1CON=0b00001001;//Internal clock,Enables Timer1
TMR1IF =0;
TMR1H  = 0x00;
TMR1L = 0x00;
GIE =1;  // Interrupt Enable
  PEIE =1;
CCP1IE =1;
while(1){}
}
static void interrupt isr(void) {
  if ( CCP1IF ) {
  low=CCPR1L;
high=CCPR1H;
  CCP1IF = 0;
  }
  // if timer interrupt: reset timer and toggle Port B.2
  if ( TMR1IF ) {
 
  TMR1H = 0x00;  TMR1L = 0x00;
  TMR1IF = 0;
  }
}

 

koolguy

Active Member

• Sep 23, 2013

• #17

I want to make controller which will capture the timing of pulse..

 

large_ghostman

Well-Known Member

Most Helpful Member

• Sep 26, 2013

• #18

i could be wrong (normally i am) but microchip probably have a app note for something like this, seems same sort of thing as say a tacho for counting RPM's, so in that case set up the capture and a timer for a set period when period expires (interrupt) count number of pulses from capture, or to put it better set capture so every time a pulse is at pin it updates a variable then when timer times out you have a count of pulses per whatever time the timer was set for. OR i might have it totally wrong as i havnt used capture yet but its on my to do list!

google for tacho projects that might give you a start, and microchip app notes are sometimes a bit full of errors but well worth a read

HTH

LG

 

large_ghostman

Well-Known Member

Most Helpful Member

• Sep 26, 2013

• #19

misterT said:

Click to expand...

just watched some of the video (on home study so should be doing math) i will watch it all later but is great video i finaly get the carrier frequency thing! seeing it on the scope helps alot. maybe you could post this on the video page of forum Mr T

thanks for posting it

 

dr pepper

Well-Known Member

Most Helpful Member

• Sep 26, 2013

• #20

That might work for sony sircs lg as is uses pulse position modulation, not sure if it'd be any good for phillip's protocol though.