Multiple IR Receivers

[ardhuru]

These modules have a weak internal pullup, so simply connecting the outputs of both modules to a single pic pin should work.

Regards,

Anand

[jhorsburgh]

Hi Guys,
What i am trying to do is have the signals come in on different pins and then send the received data along with the input pin number out through RS232. I have tried using GOTO and GOSUBS commands but it only works 50% of the time on one pin and not at all on the other.

Thanks Guys

[skimask]

Hi Guys,
What i am trying to do is have the signals come in on different pins and then send the received data along with the input pin number out through RS232. I have tried using GOTO and GOSUBS commands but it only works 50% of the time on one pin and not at all on the other.

Thanks Guys

Are you saying that because one pin is tied up looking for a pulse that it ends up missing pulses on the other pin?
Not sure if it'll help any (probably won't since a PIC is single threaded and can only act on one input at any one time unless you record any pulses you get and post-process them to see if anything useful was present during the time you recorded any pulses), but if you check your manual, you might find something that'll help you limit the MAXIMUM time the PULSIN statement waits for a PULSE (quite a few hints in that statement right there).

[dhouston]

Why are you using two receivers? If both are 38kHz, both will see both signals. Whichever pin is triggered first will seize control.

[jhorsburgh]

Hey Guys,
I had made the following changes to the code, and added the "DEFINE PULSIN_MAX 300" line to the top of the code. It now works for GPIO.3 most of the time but it does not work at all on GPIO.2. The modules are 38Khz dave but i am not sure what you mean by "both will see both signals. Whichever pin is triggered first will seize control. "

<code>
STARTPULSE:
PulsIn GPIO.3,0,CODELENGTH 'MEASURE LOW PULSE (IR LED ON TIME)
IF (CODELENGTH > 200) and (CODELENGTH < 400) Then SENSOR1
PulsIn GPIO.2,0,CODELENGTH 'MEASURE LOW PULSE (IR LED ON TIME)
IF (CODELENGTH > 200) and (CODELENGTH < 400) Then SENSOR2
goto STARTPULSE

SENSOR1:
RXPIN1 = GPIO.3
pin = 1
GOTO CODEPULSES

SENSOR2:
RXPIN1 = GPIO.2
pin = 2
GOTO CODEPULSES
</code>

Thanks Again,
Jeremy

[Bruce]

Place PulsIn GPIO.2,0,CODELENGTH before PulsIn GPIO.3,0,CODELENGTH.

Does it work with the sensor on GPIO.2 now?

[dhouston]

Unless the two receivers are optically isolated so that neither can see the signal intended for the other, both will see all signals.

The first one in your code will process the signal, blocking all of the code statements for the other one.

If you follow Bruce's suggestion, the one that wasn't working will start working but the other will stop working.