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These are my primary output devices. The computer and Parallel Port Interface operate on 5V signals, which need to be converted to a more usable voltage.

1) The Parallel Port Interface provides a 5V signal, which triggers a relay inside these boxes that in turn turns on 115V to the outlet.

2) I can plug a 115V appliance into these, or a power adapter to run any other devices. These relays are rated at 10amps, so I can run just about anything that I want to (shy of a major appliance).

3) Similarly, I created a version which has 4 unique relays in it to operate the 5 Port Pneumatic Solenoids directly.