April 2018
Intermediate to advanced
248 pages
5h 31m
English
Content preview from Internet of Things with Raspberry Pi 3
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Buzzer
We use a buzzer that is an important component of our surveillance system. In the event a trespasser bypasses the manual security, our surveillance system will not miss the trespasser. When detected near the restricted area, an alarm is raised with the help of the buzzer, which will alert the security people and force the trespasser to run away.
We make use of a piezo buzzer, which is readily available and cost-effective. A piezo buzzer is built of a piezo-electric material. The working of the piezo buzzer is based on the inverse of the principle of piezo electricity. The principle of piezo electricity states that whenever mechanical pressure is applied on piezo electric material, it generates electricity. And piezo buzzers follow ...
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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.