16LF1824 strange problem

[richard]

would it be possible to post the actual code you are using (in code tags preferably) not some edited portion.what are your config settings ? a schematic sketch could be in order. without the full story any solutions are just speculation
whats "front" ? where is that defined


this sort of code seems pretty awkward and may not really address the problem

init:
pulsin portc.2 , 1, vara
if vara < 140 or vara > 160 then init
pause 100
pulsin portc.2 , 1, vara
if vara < 140 or vara > 160 then init
if vara > 140 and vara < 160 then goto beep
goto init

have a go at something like this

DEFINE PULSIN_MAX 500   ; why wait longer if its already out of limits (may need adjustment)
init_ok  var bit

init_ok=0


init:

while portc.2    ;  wait till portc.2 goes low 
wend
while ! init_ok   ; or init_ok=0 if you like
pulsin portc.2 , 1, vara
if abs(vara-150)<=10 then init_ok=1
wend

[richard]

or 5 good pulses in a row

DEFINE PULSIN_MAX 500   ; why wait longer if its already out of limits (may need adjustment)
init_ok  var byte
init_ok=5

init:

while portc.2    ;  wait till portc.2 goes low 
wend
while  init_ok   ; or init_ok>0 if you like
pulsin portc.2 , 1, vara
if abs(vara-150)<=10 then 
init_ok=init_ok -1
else
init_ok=5
endif
wend