November 2011
Intermediate to advanced
392 pages
13h 3m
English
Content preview from Arduino Internals
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A Lot of Blinking LEDs
An Arduino Uno can light up about 20 LEDs individually. In the absence of a driver circuit, as many LEDs as you want can be driven directly by the Arduino's I/O pins, as long as the total power drawn remains less than 200mA. This can be guaranteed by limiting the current to each LED to 10mA or less, or by limiting the duty cycle of the LEDs in software so that no more than 200mA is drawn at any given time.
A Direct-Drive Example
Here is a simple circuit that connects 20 LEDs in the form of a bar graph, implemented as an Arduino shield. See Figure 8-10 for the schematic and Figure 8-11 for an example PCB layout.
Figure ...
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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.
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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.