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running with a scope probe on the same line going to the maple.
paired transistor has it's free leg tied to the middle leg.
noise looks like usual on scope, about 0-2v, very rounded, characteristic time
of a pulse around 500ns total.
used entropy_hex.cpp, then ran:
cat /dev/ttyACM0 | pv > some_bits.hex
got 200-300B/s
==============================================================================
chars: 2262
0: 152 0.067197 1.075155
1: 141 0.062334 0.997347
2: 165 0.072944 1.167109
3: 145 0.064103 1.025641
4: 159 0.070292 1.124668
5: 141 0.062334 0.997347
6: 158 0.069850 1.117595
7: 100 0.044209 0.707339
8: 152 0.067197 1.075155
9: 139 0.061450 0.983201
A: 147 0.064987 1.039788
B: 133 0.058798 0.940760
C: 146 0.064545 1.032714
D: 123 0.054377 0.870027
E: 155 0.068523 1.096375
F: 106 0.046861 0.749779
bits: 9048
zeros: 4722 0.521883
ones: 4326 0.478117
==============================================================================
$ cat partial.bin | rngtest
rngtest 2-unofficial-mt.14
Copyright (c) 2004 by Henrique de Moraes Holschuh
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
rngtest: starting FIPS tests...
rngtest: entropy source exhausted!
rngtest: bits received from input: 8333528
rngtest: FIPS 140-2 successes: 121
rngtest: FIPS 140-2 failures: 295
rngtest: FIPS 140-2(2001-10-10) Monobit: 226
rngtest: FIPS 140-2(2001-10-10) Poker: 254
rngtest: FIPS 140-2(2001-10-10) Runs: 93
rngtest: FIPS 140-2(2001-10-10) Long run: 1
rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
rngtest: input channel speed: (min=1.330; avg=7.733; max=18.626)Gibits/s
rngtest: FIPS tests speed: (min=36.261; avg=83.809; max=104.799)Mibits/s
rngtest: Program run time: 97333 microseconds
bnewbold@ziggy:~/code/entropy/test_20121121$ cat partial.
partial.bin partial.hex partial.white.bin
==============================================================================
$ cat partial.bin | ent
Entropy = 7.991205 bits per byte.
Optimum compression would reduce the size
of this 1041691 byte file by 0 percent.
Chi square distribution for 1041691 samples is 12677.89, and randomly
would exceed this value 0.01 percent of the times.
Arithmetic mean value of data bytes is 129.3382 (127.5 = random).
Monte Carlo value for Pi is 3.092728163 (error 1.56 percent).
Serial correlation coefficient is 0.005857 (totally uncorrelated = 0.0).
==============================================================================
$ cat partial.white.bin | rngtest
rngtest 2-unofficial-mt.14
Copyright (c) 2004 by Henrique de Moraes Holschuh
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
rngtest: starting FIPS tests...
rngtest: entropy source exhausted!
rngtest: bits received from input: 2071600
rngtest: FIPS 140-2 successes: 75
rngtest: FIPS 140-2 failures: 28
rngtest: FIPS 140-2(2001-10-10) Monobit: 28
rngtest: FIPS 140-2(2001-10-10) Poker: 4
rngtest: FIPS 140-2(2001-10-10) Runs: 1
rngtest: FIPS 140-2(2001-10-10) Long run: 0
rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
rngtest: input channel speed: (min=1.164; avg=5.958; max=18.626)Gibits/s
rngtest: FIPS tests speed: (min=34.933; avg=64.741; max=104.799)Mibits/s
rngtest: Program run time: 31552 microseconds
==============================================================================
$ cat partial.white.bin | ent
Entropy = 7.996434 bits per byte.
Optimum compression would reduce the size
of this 258950 byte file by 0 percent.
Chi square distribution for 258950 samples is 1285.33, and randomly
would exceed this value 0.01 percent of the times.
Arithmetic mean value of data bytes is 130.3190 (127.5 = random).
Monte Carlo value for Pi is 3.074841281 (error 2.12 percent).
Serial correlation coefficient is 0.002130 (totally uncorrelated = 0.0).
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