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Topic: millis() off by 20%? (Read 2724 times) previous topic - next topic

Osgeld

if it makes you guys feel better, I got a hold of some SF resonators and OMG they are crap, I have constant upload errors at a reasonable 19200 baud, I cant say they are off by 20% per day, but they sure as heck are not spec

but hey when you buy the cheapest garbage from china your often lucky if it works at all, luckily I got them for free so I didnt waste money on them.
http://arduino.cc/forum/index.php?action=unread;boards=2,3,4,5,67,6,7,8,9,10,11,66,12,13,15,14,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,86,87,89,1;ALL

dc42

#16
Sep 29, 2011, 10:03 am Last Edit: Sep 29, 2011, 10:26 am by dc42 Reason: 1

if it makes you guys feel better, I got a hold of some SF resonators and OMG they are crap, I have constant upload errors at a reasonable 19200 baud, I cant say they are off by 20% per day, but they sure as heck are not spec

but hey when you buy the cheapest garbage from china your often lucky if it works at all, luckily I got them for free so I didnt waste money on them.


It may be that they are crap, but are you sure they are not 16384MHz 16.384MHz resonators rather than 16MHz?
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

AWOL

Quote
16384MHz

16384kHz, surely?
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

dc42

Yes, I missed out the decimal point.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

AWOL

Still less than 3% though.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

dc42

True, but according to http://www.maxim-ic.com/app-notes/index.mvp/id/2141 there are scenarios in which a clock mismatch of more than 2% can cause problems.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

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