Random PBP

[Michael]

PBP's RANDOM command is FAR from RANDOM.
Makes good pink noise though ...

But anywho ...

    RANDOM   RandVar
    Result = RandVar ** 7 + 1

This is an older post I searched because I need to generate a random number and saw you can do it with a word variable. Like this fella, I need a smaller number.

I'm having a hard time grasping what is going on with Result = ** 7 + 1
Huh ?

Saw --
** Returns the high 16 bits of a 16-bit multiply result

But even that isn't making sense to me.

Has there been any updates to random where you can apply it to more than a word? -thanks

[HenrikOlsson]

That line of code will scale the WORD sized Randvar variable (0 to 65535) to a value ranging from 1 to 7.

Bascially it's the same as doing Result = Randvar * 7 / 65536 + 1

/Henrik.

[CuriousOne]

Use biased zener connected to ADC and sample the input

[Ioannis]

What would the range be? Near the bias?

I think a running timer that user reads the current state maybe good enough, although sure not random since it is repeating with specific period. But the reading period is not specific or related to the timer period.

Ioannis

[mpgmike]

Most of the newer PICs have Internal Temp Sensing through the ADC Module. The Temperature result would be a good source for Random Seed generation, as it will fluctuate quite a bit.