This is a multi-part message in MIME format.

------=_NextPart_000_0066_01C04AAE.6EED8A40
Content-Type: text/plain;
        charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

> to probe is fine, coz when I pressed the TV remote a few time on same
> button, they look quite even.
>
> Then, I pressed my ir keypad, thing really a lot of deferrences. my
> ir keypad output a burst of ~37khz pulse, and sometimes it output a
> burst, but sometimes it output like 2 or 3 bursts.
>
> The scope output for my signals are really bad. But for TV remote,
> the scope can display train of signals for TV remote signal.

I think the problem is that the IR signal is too weak and the receiver
may not be detecting it properly. If you are seeing a good signal
at the PIC pin and you aren't seeing it at the receiver then you'll
have to make the IR signal stronger. You need to do this anyway
to get past 10cm

Attached are suggestions for reasonably strong transmitters. You'll
certainly get a few metres with these. The 555 can source or sink
200mA so the LED can be high side or low side

Fig1 is a constant beam. Note that the power goes to the LED when
the output of the 555 is low, so the pulse train is high more than low.
This transmitter can be picked up 8 metres away by an IS1U60 if
a matched 5mm LED is used, less if a 3mm

Fig2a is a data-to-38kHz convertor. When Reset (pin4) goes low
the output is a steady low, so you need to put the LED as a low side
component. When Reset goes high, the oscillator is enabled and a
"block" of 38kHz will be sent from the LED. Note that the pulse train
is low more than high, the opposite of Fig1. To get more power you
can drive a ZTX649 directly with the 200mA available from the 555
and use multiple LEDs with smaller resistors. The ZTX649 is rated
at 1A, but there are other ZTXs rated for 3A. The main point about
them is that they are fast current switches and give good strong pulses
into the LEDs. In both circuits use a reservoir cap close to the LED/
resistor for best results. You will have to adjust the oscillator resistors
to get the correct frequency and pulse width for your components. Tune
it on the scope before attaching the LED to make sure you don't
over-power the LED. You could use the waveform of your TV remote
as a guide. Perhaps the best way might be to determine what range
you want and increase the pulse width until the receiver sees it. Work
out what the widest pulse width you can use is based on the power
dissipation of the LED. Except you probably don't know what the
LED you have is

The IS1U60 "inverts" the signal it receives. When 38kHz is present
the output is low. If your receiver does the same thing you'll need to
invert the data bits you send otherwise a "1" will cause the receiver
output to go low. Either that or invert the output of the receiver. The
IS1U60 will not work properly if a 100uF cap is not soldered directly
across its power supply pins. Without it the output is erratic, perhaps
you have the same problem

The HS38B might be a Honeywell device. I searched their site and it
said it had found 4 matches, but I couldn't find a data sheet

------=_NextPart_000_0066_01C04AAE.6EED8A40
Content-Type: image/gif;
        name="irtx2.gif"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
        filename="irtx2.gif"
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------=_NextPart_000_0066_01C04AAE.6EED8A40--

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics