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Read as input

Im looking to be able to read several devices to see if the device is open or closed, and be able to switch an output.

I did find a cheap solution that was able to read switched inputs, from Maplins, but now I cannot find the kit.

What I would like to do is build my alarm system with several PIRs so when movement is detected it triggers a output in a specific order (entry buzzer -> External Siren).

Does anyone know of a cheap PCI device, able to read 20-30 inputs, and write to 1-5 outputs?

Eventually I would like to use a MicroProcessor such as Ardunio, however for POC I would like to use a PC.

Thank you
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Dr. KlahnPrincipal Software EngineerCommented:
In the ISA bus era, there were numerous digital I/O cards, but the number of manufacturers has fallen in the PCI era.  National Instruments is the only one that comes to mind as making a reliable, documented product.  Their digital I/O cards are available inexpensively on fleabay (example 1, example 2).

If you are strapped for cash, cheap printer port cards can be used for digital I/O with the data bits as output and the status bits as input.  In bidirectional mode the data bits can also be used as input.
Dr. KlahnPrincipal Software EngineerCommented:
If you decide to go the printer port route, Lakeview Research has an excellent page on printer port I/O, including DLLs and other software interfaces for access from within Windows.
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