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IR based home automation HOW TO COUNT THE PULSE CODE MODULATION OUTPUT

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electronicfreak

Mon Jul 07 2008, 09:24PM

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HI GUYS,
I m facing a problem how to count the pulse codes given by the IR sensor TSOP1738...
i want program on the basis of which key is pressed in the remote...
I m working on a home automation( IR) project, and i m using the PIC16F72 mcu.
already i was enable the counter read the o/p of the IR sensor, but i don't know how to read the codes according to the key pressed......
please help me, and send me some example codes.........
ITS VERY URGENT......... this PROJECT DEAD LINE is on 18th july....
help me................

SACHIN
http://belgaum.myminicity.com/

Ajay

Tue Jul 08 2008, 08:19AM

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I hope you have read how RC5 remote works.. so the time for every bit is defined and fixed. After you sense the first low at pin where IR receiver is connected, you wait for fixed amount of time to read bits coming on the way with IR signal.

You may need to do lot of testing as timing is always a problem.
Try to start with something. Use my 8051 IR project as reference. It will help you.

use 1736 for reception not 1738.

PS: moving this post to PIC Discussion section.

www.rickeyworld.info
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electronicfreak

electronicfreak

Wed Jul 09 2008, 03:05AM

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what is the difference between 1738 and 1736,what is the problem with 1738....
ur code is in C or it is in assembly language......
thanx for ur suggetion..........
may i know at what time u will be online......

SACHIN
http://belgaum.myminicity.com/

Ajay

Thu Jul 10 2008, 07:12AM

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TSOP series is represented as TSOP17XX
where XX means the modulating frequency.
if you are modulating data to be sent at 38khz then you have to use TSOP1738 so that you can demodulate the signal successfully.

RC5 remote use 36khz carrier frequency so you have to use TSOP1736 to demodulate the remote signal successfully.

I dont have a fixed time for being online

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electronicfreak

sashijoseph

Thu Jul 10 2008, 11:16AM

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Read this for RC5 ... http://www.ustr.net/infrared/infrared1.shtml
And here's Ajay's code in asm ... http://www.8051projects.net/downloads185.html

Let there be music........

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electronicfreak

electronicfreak

Thu Jul 10 2008, 10:39PM

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i m using the counter in microcontroller, it it increments the register when rising pulse occurs... is it a right right way to read the rc5 code...
in ur prooject you r using the INT1 pin?
it makes any difference

SACHIN
http://belgaum.myminicity.com/

umibond

Thu Jul 10 2008, 11:01PM

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hi u can use interrupts pins...it ill be easy way i think write ur counting program inside interrupt service routine......

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electronicfreak

electronicfreak

Fri Jul 11 2008, 12:33AM

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i dont know how to count a signal which connected to intrupt pin....
please can u send me anyexample code......
is it works like inbuilt counter as mentioned in my previous reply..

SACHIN
http://belgaum.myminicity.com/

electronicfreak

Fri Jul 11 2008, 09:17PM

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thanx every one, i m using the PIC16F72 for this project ,and i m using synchronus counter on pin PC1...... there are 2 counter input pins , can i short them as u made it in above ckt............

SACHIN
http://belgaum.myminicity.com/

Ajay

Sat Jul 12 2008, 07:11AM

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just use the timer in counter mode and i think you dont even need to use interrupt pin.

whenever a the input signal complete its cycle counter will be incremented by one. Hence your pulses will get counted automatically.

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