November 2014
Intermediate to advanced
400 pages
7h 30m
English
Content preview from The TAB Book of Arduino Projects: 36 Things to Make with Shields and Proto ShieldsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 10
Laser Alarm
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).
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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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.