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[Reply #30 on:]

@wanderson, I did some previous random number testing and used an SD card to capture the output, so I didn't have to dedicate a PC to the task. Would that be acceptable?

[Reply #31 on:]

@wanderson, I did some previous random number testing and used an SD card to capture the output, so I didn't have to dedicate a PC to the task. Would that be acceptable?

Very much so, I didn't want to restrict people to hardware they may not have, but if you have such hardware it makes it somewhat easier to test.  Please post the information (and sketch used) here if you can.  Thank you!

[Reply #32 on:]

@wanderson, have a look at the sketch here, and let me know what you think:
https://github.com/JChristensen/entropyTest

[Reply #33 on:]

@wanderson, have a look at the sketch here, and let me know what you think:
https://github.com/JChristensen/entropyTest

I don't see anything that should interfere with the Entropy library, though my experience with using the String type on the arduino has been memory leaks, or at least behavior that made me believe memory leaks were occurring.  I would be curious as to how long it would be able to run.  It definitely looks like a useful way to collect data for those who are unwilling/unable to use a computer to capture the data.

Thanks for running tests!

[Reply #34 on:]

I have also had difficulties with Strings in the past, but there were improvements in 1.0, so I thought I'd give it another go. My expectation would be that it should be able to run pretty much indefinitely. I have two SD breakout boards, I should be able to get both going here shortly. I'll let them run for 24 hours or so, then get the data to you.

[Reply #35 on:]

Here are the test results so far.  Just a reminder, that while so far the test results have been good, this library really needs a lot more testing on a lot more chips--even chip types that have already been tested.  Please consider, running an arduino overnight running this test code and capturing the output.  Then email me the output or attach it to a reply to this thread along with information on the type of arduino you ran it on and the text on the arduino chip.

Any assistance on this would be greatly appreciated!

Code:

#include <Entropy.h>

void setup()
{
  Serial.begin(115200);
  Entropy.Initialize();
}

void loop()
{
  Serial.println(Entropy.random());
}

And here are the latest test results:

ID	Tester	Device	Chip	Date Code	Type	Sample Size	Entropy	Chi square	P-value	Mean	S.C.C.	Comments
001	wandrson	Arduino Uno R3	ATMEGA328p-PU	1153	DIP	1,000,000	7.999797	281.39	0.1231	127.5803	0.000811
002	wandrson	Arduino Uno R3	ATMEGA328p-PU	1107	DIP	1,000,000	7.999819	251.38	0.5524	127.4403	0.000379
003	wandrson	Arduino Uno	ATMEGA328p-MU	1103	SMD	1,000,000	7.999809	265.27	0.3163	127.4823	0.001646
004	wandrson	Arduino Mega R3	ATMEGA2560-16AU	1131	SMD	1,000,000	7.999813	258.51	0.4268	127.5548	0.000069
005	wandrson	Adafruit ATmega32u4 breakout board	MEGA32U4-AU	1038	SMD	1,000,000	7.999811	261.87	0.3703	127.4697	0.001247
006	pYro_65	Clone mega	ATMEGA2560-16AU	1110	SMD	809,984	7.999729	304.09	0.0189	127.5027	-0.000090
007	wandrson	Sparkfun AVR/Stick	TINY85-20SU	1023	SMD	1,000,000	7.999826	240.63	0.7321	127.5975	0.000831
008	wandrson	Arduino NG/Rev C	ATMEGA168-20PU	0701	DIP	1,000,000	7.999808	265.59	0.3114	127.3246	0.000910
009	Chagrin	Seeeduino	ATMEGA328P-AU	1040	SMD	1,336,360	7.999865	250.35	0.5704	127.6595	0.000431
010	Chagrin	Seeeduino Mega v1.23	ATMEGA1280-16AU	0846	SMD	1,293,500	7.999861	248.24	0.6074	127.5377	-0.000420
011	wandrson	Arduino NG/Rev C	ATMEGA168-20PU	0701	DIP	1,000,000	7.999815	256.57	0.4606	127.4765	0.0000042
012	wandrson	Arduino Mega R3	ATMEGA2560-16AU	1126	SMD	1,000,000	7.999843	217.74	0.9562	127.5359	0.000320
013	wandrson	Arduino Leonardo	ATMEGA168-20PU	1039	SMD	1,000,000	7.999788	293.57	0.0487	127.4357	0.000022
014	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	106,744	7.998190	267.92	0.2768	127.3796	0.009237
015	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	102,640	7.998103	270.08	0.2468	127.6913	-0.001888
016	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	100,000	7.998026	274.12	0.1960	127.4961	0.007423
017	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	277,388	7.999275	277.33	0.1610	127.2689	0.003250
018	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	100,864	7.986159	3084.67	0.0000	127.7945	0.032045
019	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	111,076	7.998312	259.45	0.4108	127.7697	0.000617
020	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	101,464	7.997946	288.95	0.0707	127.5182	0.006300
021	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	287,808	7.999319	271.78	0.2246	127.3042	0.002162
022	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATTINY85-20PU	1211	DIP	262,312	7.999314	249.99	0.5767	127.7828	0.001686
023	wandrson	Arduino NG/Rev	ATMEGA168-20PU	0624	DIP	539,748	7.999642	267.92	0.2769	127.6716	0.000370
024	wandrson	Arduino Pro Mini 3v3	ATMEGA328P-AU	1208	SMD	1,004,352	7.999785	298.99	0.0304	127.5872	0.001192
025	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATMEGA328P-AU	1211	DIP	111,504	7.998213	275.62	0.1791	127.2366	-0.003130
026	wandrson	Breadboard tiny, 16MHz (internal PLL)	ATMEGA328P-AU	1211	DIP	115,728	7.998499	240.81	0.7292	127.4722	-0.001927
027	wandrson	ATmega1284p on STK500	ATMEGA1284P-PU	1209	DIP	100,976	7.998129	262.24	0.3642	127.3669	-0.001081
028	P. Stoffregen	Teensy++ 2.0, 3v 8MHz	AT90USB1287	1039	SMD	254,280	7.999227	274.24	0.2188	127.1336	0.001923
029	P. Stoffregen	Teensy++ 1.0, 5v 16MHz	AT90USB646	0849	SMD	343,032	7.999508	233.23	0.8322	127.6864	-0.001012
030	P. Stoffregen	Teensy++ 2.0, 5v 16MHz	AT90USB1286	0932	SMD	280,068	7.999329	260.12	0.3996	127.6441	0.002521
031	J. Christensen	Arduino UNO SMD Edition	ATmega328P-MU	1034	SMD	650,176	7.999712	259.91	0.4030	127.3920	-0.000527
032	J. Christensen	Breadboard Arduino close, 16MHz xtal	ATmega328P-PU	1053	DIP	670,112	7.999712	267.48	0.2832	127.5512	0.000849
033	wandrson	ATmega1284p on STK500	ATMEGA1284P-PU	1211	DIP	484,292	7.999649	235.48	0.8045	127.4796	-0.000014
034	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	104,648	7.997952	297.51	0.0347	127.7577	-0.001279
035	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	310,560	7.999305	299.36	0.0294	127.4556	-0.000165
036	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	106,376	7.998142	274.67	0.1897	127.1853	0.001980

All of the above tests were performed on different chips. No repeated tests on the same chip, unless otherwise noted. Since test number 018 failed so spectacularly, I retested that same chip in test number 022. Tests 014 - 022, 025-026, and 034-036  were performed using arduino-tiny-0100-0013.zip from http://code.google.com/p/arduino-tiny/. Test 027 and 032 was performed using Mighty 1284P core files with the original bootloader.

[Reply #36 on:]

Here are some additional test results:

ID	Tester	Device	Chip	Date Code	Type	Sample Size	Entropy	Chi square	P-value	Mean	S.C.C.	Comments
037	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	102,412	7.998406	225.98	0.9045	127.1473	0.000618
038	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	100,368	7.998131	260.48	0.3935	127.4403	-0.004133
039	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	101,964	7.998389	227.51	0.8914	127.0540	-0.004832
040	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	236,136	7.999246	247.63	0.6178	127.3000	-0.002023
041	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	100,144	7.998202	249.55	0.5846	127.8017	0.000526
042	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	107,092	7.998095	282.90	0.1108	127.4241	0.001396
043	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY85-20PU	1211	DIP	100,168	7.998309	234.68	0.8146	127.5922	0.002843
044	J. Christensen	Arduino UNO SMD Edition	ATmega328P-MU	1034	SMD	1,000,000	7.999809	264.47	0.3286	127.3932	-0.000010
045	J. Christensen	Breadboard Arduino close, 16MHz xtal	ATmega328P-PU	1107	DIP	1,000,000	7.999792	289.05	0.0702	127.5088	0.000577
046	wandrson	Breadboard 1284p, 16mhz xtal	ATTINY1284P-PU	1211	DIP	446,972	7.999577	262.65	0.3575	127.4290	-0.002572
047	wandrson	Breadboard 1284p, 8mhz xtal	ATTINY1284P-PU	1211	DIP	109,740	7.998350	251.61	0.5483	127.5261	0.001790
048	wandrson	Breadboard 1284p, 8mhz xtal	ATTINY1284P-PU	1211	DIP	318,432	7.999402	264.35	0.3305	127.5598	0.001933
049	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	278,960	7.999355	248.84	0.5969	127.8017	-0.003964
050	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	100,288	7.998213	249.05	0.5933	127.5756	-0.003266
051	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	100,020	7.998360	226.46	0.9009	127.3991	-0.002293
052	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	102,916	7.998466	218.49	0.9527	127.3037	-0.002528
053	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	265,420	7.999419	213.39	0.9728	127.6136	0.000817
054	Coding Badly	Arduino UNO R2	ATMEGA328P-PU	1107	DIP	839,988	7.999778	257.95	0.4367	127.3391	-0.003102
055	wandrson	Breadboard 1284p, 8mhz xtal	ATTINY1284P-PU	1211	DIP	649,728	7.999697	273.19	0.2071	127.4459	-0.001684
056	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	102,860	7.998113	269.98	0.2483	127.5559	0.005196
057	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	96,068	7.997948	274.55	0.1911	127.4590	0.005131
058	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY84-20PU	1010	DIP	101,164	7.998136	262.13	0.3661	127.0534	-0.004649
059	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	284,072	7.999377	245.09	0.6610	127.3208	-0.000006
060	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	100,072	7.998263	240.50	0.7341	127.3423	-0.003373
061	wandrson	Breadboard tiny, 16mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	110,644	7.998224	272.66	0.2136	127.4735	0.002846
062	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	100,912	7.998196	252.70	0.5289	127.3467	0.008878
063	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	100,164	7.998027	273.66	0.2016	127.2111	0.002015
064	wandrson	Breadboard tiny, 16mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	214,760	7.999182	243.37	0.6891	127.4248	-0.005771
065	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	103,656	7.998399	229.73	0.8704	127.4767	-0.003893
066	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	118,676	7.998584	232.00	0.8463	127.3653	-0.008254
067	wandrson	Breadboard tiny, 16mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	107,920	7.998366	244.52	0.6704	127.2434	-0.007688
068	wandrson	Breadboard tiny, 1mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	101,716	7.998237	247.82	0.6147	127.2760	-0.000026
069	wandrson	Breadboard tiny, 8mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	231,740	7.999281	230.80	0.8594	127.5449	-0.000518
070	wandrson	Breadboard tiny, 16mhz (internal oscillator)	ATTINY45-20PU	1211	DIP	123,820	7.998312	289.80	0.0662	126.9300	-0.003889
071	P. Stoffregen	Teensy2  5v, 16MHz	MEGA32U4-AU	0945	SMD	383,380	7.999503	264.98	0.3208	127.6570	0.001401
072	Elvind Triel	Arduino Duemilanove	ATMEGA328P-PU	0948	DIP	1,226,256	7.999859	239.46	0.7495	127.6417	-0.000672

All of the above tests were performed on different chips. No repeated tests on the same chip, unless otherwise noted. Since test number 018 failed so spectacularly, I retested that same chip in test number 022. Tests 014 - 022, 025-026, 034-043, 049-053, and 056-070  were performed using arduino-tiny-0100-0013.zip from http://code.google.com/p/arduino-tiny/. Test 027, 032, 046-048, and 055 were performed using Mighty 1284P core files.

[Reply #37 on:]

I have also had difficulties with Strings in the past, but there were improvements in 1.0, so I thought I'd give it another go. My expectation would be that it should be able to run pretty much indefinitely.

It should run indefinitely with the String implementation (developed in Teensyduino) which I tried to contribute for Arduino 1.0.  Sadly, the String that made it into Arduino has numerous changes that defeat much of the careful optimization work I did.  My attempt to fix memory allocation problems was also not used.

If it crashes on an Arduino board, could you please give the same sketch a try on a Teensy?

[Reply #38 on:]

Howdy,
  It's 4 months later, and I am wondering, are you still looking for test results?  I have a few chips I could run this on.

[Reply #39 on:]

Yes, more results would be helpful.