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PIC Microcontoller Math Methods

3706/5164

Random number generators

Quick little 8 bit random number generators

Random number generator for the 16F876 using timer 0

A few of the lowest order bits of an existing A2D value can be used as a random number or at least as a seed for one of the generators above. This works best when a high resolution A2D is being used to measure a high noise signal (where the signal is resolved by averageing)

Hardware white noise generator

, design by dr. Imre Bartfai, 8/30/1999 

 
 +--------------------------------------------------------------------- Vdd
 |                           220k                    220k               5V
 |                       +---\/\/\---+           +---\/\/\---+------+
 |                       |           |           |           |      |
 |                       |    |\     |           |    +------+      \
 | EFT317 PNP      +-----+----|- \   |           |    |             / 220k
 |      C          |     |    |    >-+----| |----+    |     |\      \
 |   |/            \  +-------|+ /        47n    |    +-----|- \    |
 +--B|        220k /  |  |    |/                 |    |     |    >--+
     |\            \  |  |  1/2 LM358            +----------|+ /    |
       |E          |  |  |                       |    |     |/      \
       +----| |----+--+  +                       +    +             /  47k
       |    47n    |     |                       |    | 1/2 LM358   \
       \           \     \                       \    \             |
  4k7  /        1M /     / 2k2                1M /    / 2k2         + out
       \           \     \                       \    \
       |           |     |                       |    |
       +-----------+-----+-----------------------+----+---------------- Vss

 Standard TTL can not be driven, but CMOS (and maybe LS) are o.k.
 The power supply must be filtered thoroughly due to the high gain!

Linear Congruential Sequence

See also:

Archive:

file: /techref/microchip/rand.htm, 3KB, , updated: 2006/4/9 10:21, local time: 2008/7/6 09:32,
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