Electronics > Beginners
I looking for a component or a circuit that able to do loop like explain below
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athtrya:
The problem, I have system with 8 input and only 1 output, so I need to do a scan on all the pin and if 1 input pin is on this should stop the scan and active the output, when the input go off the scan restart.

I know it's possible to do it with a microcontroller but I think more reliable in the long time by using a dedicated component it's also help for the long time reparability. (And also I'm not capable to do the code for the microcontroller anyway)

The diagram if this can Help https://docs.google.com/drawings/d/1hHYEHJ7nMK8Jk5SwAXiAzeT2Aa1DrbVbUVVygmKjdf4/edit?usp=sharing
Brumby:
Your requirements are very poorly specified - so while the following suggestion would appear to provide you with what you want, please forgive me if this suggestion isn't suitable....

A 4078B logic chip.  It's an 8 input OR/NOR gate.
athtrya:
I have add the diagram hope this can help
LateLesley:
You're probably looking for something like a multiplexer chip. In the old 74 series, it would be something like the 74151.

https://www.esi.uclm.es/www/isanchez/apuntes/ci/74151.pdf

You would need other components with it, a 3 bit counter to cycle through the inputs, and a clock to cycle the counter, but with an enable pin which stopped the clock when the output was high.
Brumby:
I can't see any reason to have a scanning process.  The 8 input logic gate would seem to do what you want - unless there's some requirement which you haven't detailed.

The scanning idea seems to be making a simple task rather complicated.
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