Saturday, April 13, 2013

Digital Security System

Introduction This years electronics systems project was a computer security system. It was a complex project, because we first had to research the different ways for the project to be done. Internet was the main way of research for this, and for the most discover it didnt braid up anything as far as what we could use. So, in turn we sat down and started to think, what would happen if we used a digital security code. So thats what we did, we put together a complicated system incorporating a dual blank-input NAND gate, a quad dual-input OR gate, and an inverter. When the correct combination is entered it triggers a SCR that in turn triggers a relay, making the power turn on in the computer. If the wrong combination is entered it triggers another SCR that triggers a relay controlled shock circuit giving power to a piezo buzzer emitting an alarm sound.

Technical          The circuit supplies its own power so it doesnt intercede with the power bestows wattage ratings. The power is a power supply circuit that incorporates the 7805 regulator chip. In the circuit all of the chips essential have a constant 5 volt supply.

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alone of the switches on the circuit are DPST, with one of the throws on the nix 5 volts, another throw having a positive 5 volts, and the pole having to be filmed to either +5 or ?5 volts. When the pole is selected to the ?5 volts it sends a portend of 0, but if you select +5 volts it sends a signal of 1. When all of the inputs to the NAND gate are 1s it will emit a signal of 0 when that signal hits the inverter it turns it to a signal of one. When this signal is a one it...

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