IOCTL BLOG - 임베디드 개발자 블로그~☆

HDD S.M.A.R.T check fail

욱_스 — Thu, 04 Mar 2010 09:33:33 +0900

1년 반 정도 된 hdd고장으로 RMA받음 AS센터에서 바로 교체해 줬다는.. 대만족~

iPhone 에서 작성된 글입니다.

국회도서관 방문

욱_스 — Wed, 03 Mar 2010 17:57:42 +0900

자료 찾으러 가서 온종일 검색, 복사, 검색, 출력
구내식당 밥 맛있음 ㅋ

iPhone 에서 작성된 글입니다.

toeic test

욱_스 — Tue, 02 Mar 2010 13:37:20 +0900

ㅎㅎ 잼있었다~

iPhone 에서 작성된 글입니다.

로커암래쉬 교체

욱_스 — Mon, 22 Feb 2010 00:44:07 +0900

교체하는데 1시간 정도 소요
엔진소리가 한결 조용해짐
시동이 부드러워짐
출력 향상 여부는 나중에 확인

iPhone 에서 작성된 글입니다.

AV 케이블

욱_스 — Wed, 13 Jan 2010 00:14:06 +0900

남은 쇼캐쉬를 써서 벨킨 제품으로 사버렸음~

iPhone 에서 작성된 글입니다.

8Bit.. 마이컴..

욱_스 — Thu, 24 Dec 2009 23:40:16 +0900

GPS, CDMA, 2.4GHz RF, Accelerometer,
.. 이중정적분과 중력가속도 필터링..

칼만 어쩌구 필터를 써야 된다는군..

NEC micom 78k0 Sample Codes.

욱_스 — Wed, 23 Dec 2009 17:43:59 +0900

http://www.necel.com/micro/ja/designsupports/sampleprogram/78k0/

Dell Inspiron mini9..

욱_스 — Fri, 04 Dec 2009 00:04:10 +0900

잠깐 스쳐 지나간 넷북..
8인치대에 아톰 CPU를 사용하고,
칩셋 등이 X86OSX와 호환이 잘되는 제품.
OSX도 설치하고 Cocoa도 깔았건만..
넷북.. 사용하기엔 너무 느렸다...+_+;;;

가속도계를 통한 이동거리 산출...

욱_스 — Mon, 30 Nov 2009 17:57:08 +0900

http://kristoph.minchau.com/Robotics/Resources/distance_with_accelerometer.html

http://blogs.sun.com/roger/entry/location_location_location_accelerometer

http://www.google.co.kr/search?complete=1&hl=ko&lr=&newwindow=1&q=accelerometer+distance&start=10&sa=N

http://sirini.net/blog/?p=788

finding distance traveled from accelerometer readings

욱_스 — Mon, 30 Nov 2009 17:45:05 +0900

Q.
finding distance traveled from accelerometer readings

Hi There,

I would appreciate any suggestions you have..

I've got a sparkfun serial tri-axis accelerometer
SparkFun Electronics - Serial Accelerometer Tri-Axis v5 - Dongle

I would like to look at only the x axis data and over a given timeframe find the distance traveled from the accelerometery data.

It outputs..
X=-0.983 Y=1.227 Z=-0.007
X=-0.987 Y=1.223 Z=-0.013
...
at an adjustable 250x per second

These units are in g's, 1g = 9.8m/s^2

What method can I use to take these readings as they come in and at the end of the time period have single number for the distance traveled (m)?

Any ideas most welcome. Thanks

A.
Well what you have are a periodic string of acceleration readings from the device between (0-590 Hz), so by recording the values over a period of time, you are essentially plotting an acceleration-time graph, for the x direction.

So what you need your software to do iis start recording data at a specified time , and finish recording at another specified time . Then to get back to the distance travelled, you need to integrate twice between and .

Numerical integration is what pops to mind, (which would be very staightforward, knowing your fequency, and each of your acceleration values) but you'd need to integrate twice, so I'm not too sure there is a method for this.

All I can think is to somehow interpolate the points as a function (which I can see being difficult), and then calculate .

Maybe someone else knows of some better methods. (You might do well to ask about it on a programming forum)