May 2019
Intermediate to advanced
542 pages
13h 37m
English
Content preview from Mastering GUI Programming with Python
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PWM
Find a light switch in your house with reasonably responsive bulbs (LED bulbs work best). Then, try turning them on and off once per second. Now flick the switch faster and faster until the light in the room appears almost constant. You should notice that it seems dimmer in the room than when you had the light on all of the time, even though the bulb is only ever completely on or completely off.
PWM works in the same way, except that, with the Pi, we can turn the voltage on and off so quickly (and quietly, of course) that the toggling between on and off appears seamless. Additionally, by varying the ratio of how long the pin is on to how long it is off in each cycle, we can simulate varying voltages between zero voltage and the maximum ...
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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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