Random Numbers

jemly · Joined: 13 May 2007 Posts: 34

I have got a pwm output for which I generate the duty value randomly using rand(). I currently set the rand_max value like this in my header file:

#define RAND_MAX 1023
#include <stdlib.h>

However, I would like to be able to adjust the maximum value from a POT, and then ultimately the minimum value. I'm just wondering if anyone can give me any advice on the best way to do this, or point me in the direction of any resources?

Thanks!

RLScott · Joined: 10 Jul 2007 Posts: 465

Well, a nice linear function of the original random number would serve the purpose. Supoose your POT is read by an A/D input into a number, val, from 0 to 255. Then you could generate a random number in the range of 0...val with: