Hi, I'm working on an interface board that have to get state inputs
from sensors of many types with signals ranging from 5VDC to 24VDC
(i.e. signals from 5 to 24V mean logic "1"), the problem is that this
interface should be able to work with direct TTL outputs from sensors,
too. The problem is that I was thinking about using optoisolators to
isolate the target system but I know that a TTL signal won't be able
to drive the LED from the opto, so, how do I do this???
I can use a 5VDC and 12VDC power supply.
Any help with ideas and/or schematics would be appreciated.
Regards
Henry
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