February 2009
Beginner
128 pages
2h 45m
English
Content preview from Getting Started with ArduinoBecome 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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RANDOM NUMBER FUNCTIONS
If you need to generate random numbers, you can use Arduino's pseudorandom number generator.
randomSeed(seed)
Resets Arduino's pseudorandom number generator. Although the distribution of the numbers returned by random() is essentially random, the sequence is predictable. So, you should reset the generator to some random value. If you have an unconnected analog pin, it will pick up random noise from the surrounding environment (radio waves, cosmic rays, electromagnetic interference from cell phones and fluorescent lights, and so on).
Example:
randomSeed(analogRead(5)); // randomize using noise from pin 5
long random(max) long random(min, max)
Returns a pseudorandom long integer value between min and max – 1. If min is not specified, the lower bound is 0.
Example:
long randnum = random(0, 100); // a number between 0 and 99 long randnum = random(11); // a number between 0 and 10
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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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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.