Post by thread:Random sequence

Hello all, Is there a way to a random sequence from either external input, or from the programming itself. I¹m doing led dies, and the method used just flashes through the sequence, until the user stops pushing the button. I¹d rather just have them push it once, no long period to hold, to start sequence, and then have it use a random source to determine the number instead. Dave Gomez -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

In a message dated 08/12/2002 11:19:23 Eastern Daylight Time, spam_OUTilinuxTakeThisOuTDKGOMEZ.COM writes: > Is there a way to a random sequence from either external input, or from > the programming itself. I¹m doing led dies, and the method used just > flashes through the sequence, until the user stops pushing the button. I¹d > rather just have them push it once, no long period to hold, to start > sequence, and then have it use a random source to determine the number > instead. > > Dave Gomez > Hello, Dave Just write start random x do your flashing thing goto start if you make x a byte you get random numbers from1 to 1024. Sid -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

{Quote hidden}> -----Original Message----- > From: Sid Weaver [SMTP:.....NEWZEDKILLspam@spam@AOL.COM] > Sent: Monday, August 12, 2002 4:24 PM > To: PICLISTKILLspamMITVMA.MIT.EDU > Subject: Re: Random sequence > > In a message dated 08/12/2002 11:19:23 Eastern Daylight Time, > .....ilinuxKILLspam.....DKGOMEZ.COM writes: > > > > Is there a way to a random sequence from either external input, or from > > the programming itself. I¹m doing led dies, and the method used just > > flashes through the sequence, until the user stops pushing the button. > I¹d > > rather just have them push it once, no long period to hold, to start > > sequence, and then have it use a random source to determine the number > > instead. > > > > Dave Gomez > > > > Hello, Dave > > Just write > > start > random x > do your flashing thing > goto start > > if you make x a byte you get random numbers from1 to 1024. > > Sid > Well, I don't know what HLL you are using, or how you manage to fit 1024 in a single byte :0) Truly random numbers are not easy to generate, and the topic has been discussed countless times on the list. If you want some numbers that simply appear to be random, you can quite easily make a pseudo-random number generator in a PIC. Take a look at http://www.piclist.com/techref/microchip/rand8bit.htm for some examples. Regards Mike -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Mike, that's more like it. I didn't get the random x thing, as I want to use assembly, not C. Thanks, Dave {Quote hidden}> Well, I don't know what HLL you are using, or how you manage to fit 1024 in > a single byte :0) > > Truly random numbers are not easy to generate, and the topic has been > discussed countless times on the list. If you want some numbers that simply > appear to be random, you can quite easily make a pseudo-random number > generator in a PIC. Take a look at > http://www.piclist.com/techref/microchip/rand8bit.htm for some examples. > > Regards > > Mike > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

{Quote hidden}> -----Original Message----- > From: Sid Weaver [SMTP:EraseMENEWZEDspam_OUTTakeThisOuTAOL.COM] > Sent: Monday, August 12, 2002 4:24 PM > To: PICLISTspam_OUTMITVMA.MIT.EDU > Subject: Re: Random sequence > > In a message dated 08/12/2002 11:19:23 Eastern Daylight Time, > @spam@ilinuxKILLspamDKGOMEZ.COM writes: > > > > Is there a way to a random sequence from either external input, or from > > the programming itself. I¹m doing led dies, and the method used just > > flashes through the sequence, until the user stops pushing the button. > I¹d > > rather just have them push it once, no long period to hold, to start > > sequence, and then have it use a random source to determine the number > > instead. > > > > Dave Gomez > > > > Hello, Dave > > Just write > > start > random x > do your flashing thing > goto start > > if you make x a byte you get random numbers from1 to 1024. > > Sid > Well, I don't know what HLL you are using, or how you manage to fit 1024 in a single byte :0) Truly random numbers are not easy to generate, and the topic has been discussed countless times on the list. If you want some numbers that simply appear to be random, you can quite easily make a pseudo-random number generator in a PIC. Take a look at http://www.piclist.com/techref/microchip/rand8bit.htm for some examples. Regards Mike -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email KILLspamlistservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

The simple true random number generator would be to run a timer while the pushbuton is held down - this timer could increment while the button is pushed and thus the number generated would be the time the user held the button down. If a fast incrementing counter is used this would be absolutely random since you cannot push a button for exactly 34 uS repeatedly, unless you have superhuman reflexes. > {Original Message removed}