Time limit while waiting for input ?

[Sam]

Richard, you're awesome ! thanks very much !

This morning is the first chance I've had to try it without constant interruption. I must have done something a little different because it wouldn't work until I added...

moveup:
high blue ; led on
high up ; motor on
RUN_COUNT=200 ; set time limit 200*500mS ie 100 sec
while (limup = 1 ) && ( RUN_COUNT>0) ; do this till time runs out or limit sw trippe
pause 500
toggle blue ; flash led
RUN_COUNT = RUN_COUNT -1
wend ; all done
IF limup = 0 OR RUN_COUNT =>0 THEN
low blue
low up
ENDIF

Not sure why it doesn't work right without the ">0" but in any case, it's working great. Thanks again !!

[richard]

I have some doubts about your modification, perhaps you have some noise entering the system, or the limit switch is "bouncing"

IF limup = 0 OR RUN_COUNT =>0 THEN
low blue
low up
ENDIF

firstly operator precedence make this If test dodgy, parentheses ensure correct result
IF (limup = 0 ) OR (RUN_COUNT =>0) THEN
secondly

RUN_COUNT =>0

since pbp vars are unsigned , this will always be true it can only be 0 or greater
since the run_count test always tests true the if statement is always true

thirdly
the while loop will only exit if limup is 0 or run_count is 0 , the statement is or should be redundant