can assign an input with a logic high or low??

ice-egoz

Hi there, I wud like to assign the input pin with logic low so as to be able to switch off the alarm.
therefore the coding is like the following:

INPUT·8 ' lets say originally the logic is 0 and then after which the logic is 1 and now i wanna make···
············' it logic 0 again, is there anyway as to be able to assign IN8=0?




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I need all ya guidance Masters. [noparse]:)[/noparse]

Jon Williams

No, an input pin only "looks" at the outside world, and if you change an input to an output you might damage the pin, depending on the pin state and the external button state (the 220-ohm resistor in our standard input circuit [noparse][[/noparse]attached] prevents damage due to programming errors).

If you connected a standard [noparse][[/noparse]active-low]·input circuit, you could read the pin like this:

Check_Alarm_Enable:
· IF (IN8 = 0) THEN
··· ' do not sound alarm
· ELSE
··· ' allow alarm to sound
· ENDIF
· RETURN




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Jon Williams
Applications Engineer, Parallax
Dallas Office