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Hardware details:

To switch lamps on mains voltage (110-230Volt AC) it is possible to use relays. But a cheaper and more reliable solution is using Triacs. And use opto couplers to separate the Low voltage from PC and the high voltage from mains.
Diagram below shows an example. (Extra switches are added to add a buzzer push button and to switch of the buzzer).

electric circuit diagram electric circuit diagram


© 2014, Henk Jegers