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The TAB Book of Arduino Projects: 36 Things to Make with Shields and Proto Shields by Simon Monk

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CHAPTER 10

Laser Alarm

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This project uses a laser module and a mirror to make a spy-styled laser alarm. In this case, the triggering of the alarm activates a relay. This offers the best flexibility in attaching sirens, lamps, or various other devices in response to the alarm being triggered. Once triggered, the alarm remains active until the reset button is pressed (Figure 10-1).

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FIGURE 10-1 Laser alarm.

An alarm like this is really more for fun than for serious security. It is actually fairly easily defeated using a sheet of paper placed close ...

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