Oh, OK.  I thought maybe you were using some sort of monolithic modulated
IR transmitter to match the receiver.  So have you tried connecting the
output of the IR receiver to the PC serial port, after of course
converting to RS232 levels?  Looking at that I see WAY more potential for
screwing things up on the transmit side.  If the PWM isn't right, or the
gate isn't just right, or whatever.  But since you know the receiver works
right with data from the PC, thenextquestion is what the IR receiver is
seeing.

Have you hung a 'scope anywhere on this yet?  I'd especially be looking at
the output waveform of the receiver fo noise or slow rise/fall times.  I'd
also look to make sure the xmit 38kHz modulation looks good.

Dale
--
"Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only the cat died nobly."
          - Arnold Edinborough


On Thu, 6 Dec 2001 PICLIST@MITVMA.MIT.EDU wrote:

> >Hrmm.  Those look OK.  I've done the same thing except for the baud rate.
> >Do you have a schematic you can post somewhere, even if just the comms
> >part?  Maybe there's a clue there.
> >
> >Dale
> The xmitter circuit is on
> http://www.rentron.com/Infrared_Communication.htm  figure 6.
> I do not think this is the problem.
> The rx circuit is an lcd hooked to a F84, I have used this plenty of times
> It works fine connected to my serial port on the PC.
> The only change I made was to disconnect the TX line and connect the
> IR unit (GP1U26X). Pin1 to the RX pin on the F84, pin2 to Vcc and
> pin3 to GND.  When I make this change, the bottom line of the LCD starts
> flashing garbage, whether I am sending the IR ddata or not.
> My code only writes to the bottom line.
> When I disconnect the IR module and put  the TX line from the PC the LCD
> display clears and displays any character I send properly.
> Any thoughts ?
> Thanks,
> Kevin
>
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