16LF1824 strange problem

[Acetronics2]

looks everything perfectly obvious ...

1) @ first pass, varb value is not initialized ... so, it may be 255, 0 or whatever you want ... not really important here, but ...
2) your receiver may output its fail-safe value signal ( 1500µs ? ) until the Tx signal is captured .... so, a false detection may occur.

so, remember to ALWAYS initialize your variables ... here, 0 will make it !!!

one other little thing ...
pause 20 is not so good, as you can miss one pulse if signal incomes @ more than 46 Hz ( Graupner/JR is 45 Hz ... tadaaaaaa ) ...
as PULSIN waits for the pulse to occur, there's no special need for this delay ... other than pacing the detection loop.


and also think if the Tx is off, the Pic returns 0 as a PULSIN measure ...

Alain

[midali]

Thx Alain !

My Rx have not a fail-safe. When signal is missing the pulse is 0 .
I use for test usually RC , not Graupner or Futaba JR

I changed my code, but the same:

varb var byte
varb = 0
pause 200

init:
pulsin portc.2 , 1, varb
if varb < 140 or varb > 160 then init
if varb > 140 and varb < 160 then goto beep
goto init