generate random number in 16f628 - Electronic Circuits Projects Diagrams Free

johnson · 10th April 2004, 05:08 PM

dear all,

anyone knows how to "continuosly " generating a series of random number in 16f628, prefereble in using pic basic. I try using random command but it does not generate the random number.

thanks!

cheers,

falleafd · 10th April 2004, 09:34 PM

I don't know how to write basic for pic, but i remembered that there is a algorithm to build random function as I studied on programming in high school.

The fact that random is not relly random, but it's made from an algorithm that choose one of upto 10^12 matrix elements in Pascal. And if you want, you can make it.

Perhaps you have to review how to generate random function in high level languages, and then do it in PICs. I'm in doubt that high level language for PIC can give random function. If you find out the ans, pls tell meeh. I also care bout it.

Exo · 10th April 2004, 09:52 PM

might be of interest
http://www.phanderson.com/PIC/16C84/random.html

Just google it... comes up with lots of hits

csaba911 · 11th April 2004, 05:43 AM

Try this, gets numbers from 1 to 255

Code:

     FOR R = 0 TO 10
	  X= RANDOM+X
	  NEXT R
	  RND=X/250

x is a DWORD
RND is BYTE long
I hope ist help.

Why is the random command not generating you random numbers ?
It is 16 bit long 1 - 65535, there is 65535 combination, I just tried,
for 5 min I have never got the same number !? [1sec/num]

STEVE

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

10th April 2004, 05:08 PM	(permalink)
johnson	generate random number in 16f628 dear all, anyone knows how to "continuosly " generating a series of random number in 16f628, prefereble in using pic basic. I try using random command but it does not generate the random number. thanks! cheers,

10th April 2004, 09:34 PM	(permalink)
falleafd	I don't know how to write basic for pic, but i remembered that there is a algorithm to build random function as I studied on programming in high school. The fact that random is not relly random, but it's made from an algorithm that choose one of upto 10^12 matrix elements in Pascal. And if you want, you can make it. Perhaps you have to review how to generate random function in high level languages, and then do it in PICs. I'm in doubt that high level language for PIC can give random function. If you find out the ans, pls tell meeh. I also care bout it. __________________ Falleaf mail@falleaf.net English forums at PIC Vietnam - Vietnamese Electronics forums R&P Trading and Forwarding Co. Ltd. Distributor of Microchip in Vietnam

10th April 2004, 09:52 PM	(permalink)
Exo	might be of interest http://www.phanderson.com/PIC/16C84/random.html Just google it... comes up with lots of hits

11th April 2004, 05:43 AM	(permalink)
csaba911	Try this, gets numbers from 1 to 255 Code: FOR R = 0 TO 10 X= RANDOM+X NEXT R RND=X/250 x is a DWORD RND is BYTE long I hope ist help. Why is the random command not generating you random numbers ? It is 16 bit long 1 - 65535, there is 65535 combination, I just tried, for 5 min I have never got the same number !? [1sec/num] STEVE