August 2023
Beginner
128 pages
5h 43m
English
Content preview from Make: Volume 86
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LIGHT-ACTIVATED ALARM CLOCK
Would you like an optical alarm clock triggered by
sunlight? If you are self-employed or retired and
want to rise with the sun, the circuit in Figure
F
is for you. The circuit is silent when the cadmium
sulfide photoresistor is dark. When sunlight (or
any other light source) strikes the photoresistor,
the op amp switches Q1 on, which actuates a
piezo buzzer.
Place the circuit near your bed so the buzzer
will sound when light through a window is bright
enough to begin your day. Potentiometer R1 can
be used to adjust the sensitivity of the circuit.
As you have probably noticed by now, this
simple circuit has other applications. ...
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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.