Random Number

Random Number

This library allows users to get a random number.

randomSeed

Description: randomSeed() initializes the pseudo-random number generator, causing it to start at an arbitrary point in its random sequence. This sequence, while very long, and random, is always the same.
Syntax: randomSeed(unsigned int seed)
Parameters: seed: A number to generate the seed
Returns: None

random

Description: The random function generates pseudo-random numbers.
Syntax: long random(long min_num, long max_num)
Parameters: min_num: Lower bound of the random value, inclusive (optional)
max_num: Upper bound of the random value, exclusive
Returns: A random number between min and max-1 (long)

Example

This example outputs a random number from 0 to 99 every 100ms.


#include <Arduino.h>

#define INTERVAL 100
    
void setup()
{
    Serial.begin(9600);
    randomSeed(millis());
}
    
void loop()
{
    Serial.println( random(0, 100) );
    delay(INTERVAL);
}