RFM12 with picbasic_pro

[prstein]

Hello Craig,

Have you made any changes to the code? Perhaps added an interrupt that might be pulling it out? If you have made some changes please post your code, it might be somewhat easier than guessing...

Just to test something, try replacing

TXWait:
  if nirq = 1 then
      goto TXWait
  endif

with "pause 100" or something like that.

Also, check with a meter or scope that nIrq actually goes low.

Best Regards,
Paul

[craigwb]

Hi Paul

Thanks for the reply, I have used the code exactly like you have written it without any extra interupts etc.
What I did was remove the TXWait and just put a PAUSE 100 in then it does transmit.
What is funny is if I put a meter on the nIRQ pin then it keeps sending info on the SEROUT2 and the TX Led remains ON,
If I take the meter off the pin then it settles down ant the TX Led switches off. What I did was wire an extra LED onto a unused pin on the PIC and then
monitor this in relation to the nIRQ pin when it goes High or Low.

I read no voltage on the nIRQ pin but the extra led stays on so there is something weird with this pin?
Maybe I should rebuild the PCB onto a Veraboard instead on leaving it all on a Bread Board as there seems
to be a lot of capacitance floating around, I suppose that this could cause a problem on the nIRQ pin?

What can you suggest Paul?

Kind Regards

Craig

[prstein]

Hello Craig,

I suspect you've found the problem--capacitance (or other leakage) in the setup. Good job! I think you'll do better on veraboard... For a quick fix try putting relatively high value pull-down resistors (~10k to 1M) on the nIrq and LED pins. From what you describe something is causing one of those pins to float high.

Best Regards,
Paul

[craigwb]

Thanks Paul

I will rebuild and see how it goes.

Kind Regards

Craig

[camerart]

Hi All,
I've just ordered some similar RFM modules, and hope to get them working. The code above looks good, and thanks.
Camerart.