النحلة, الثمر , الاكبر

دع المقادير تجري في اعنتها 
ولا تبيتن الا خالي البال
مابين طرفة عين وانتباهتها 
يغير الله من حال الى حال
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كن كالشجر          
 يرميك الناس بالحجر وترميهم بالثمر   

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المؤمن كالنحلة اينما وقع نفع 

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الامام الشافعي
الامام حسن البنا
محمد صلى الله عليه وسلم

Wireless Sensor + Robot control

My colleague is programming  Wireless Sensor TelosB which only can be programmed via the open source Linux operating system. TelosB has printed copper antenna, temperature, light and humidity sensors and can be powered by usb or 2 AA alkaline batteries. Which is also compact in size, approx 2cm by 5cm.

He is using the transciever part aiming to control IROBOT ROOMBA vacuum cleaner via mobile and computer.

Here is a Roomba review

Online Free courses from heavy duty sources

www.coursera.org

a crazy website now you can get free lessons in different fields from Artificial intelligence to philosophy ! from 16 different universities including Stanford university one of the top university in USA if not the world. You will be taught by award winning teachers, professors , doctors. For example the teacher of Introduction to mathmatical thinking , wrote 35 books, has 80 research papers published, has 5 awards and more! Wow and for free! You get a certificate in many courses once you adequately finish it. All this and you are sitting at your disposal anywhere you want. I signed in for Machine learning , Cryptography, Introduction to mathmatical thinking , Think again; how to reason and argue, control of mobile robots, nanotechnology: the basics, game theory.
 Good luck to you too 

Multimeters basics in few mins

Here is a must know basic knowledge , click on the following 3 links to get an overview. Practice is essential to get handy with it.

How to measure Voltage, Current, Resistance, Short/open.

Multimeter Accuracy, counts, resolution and calibration by the geneous Dave jones

and here is ac voltage detection probe to detect the high voltage existance , can save lives.

Solitude by Mrs. Ella

Solitude

Laugh, and the world laughs with you;

Weep, and you weep alone.

For the sad old earth must borrow it's mirth,

But has trouble enough of its own.

Sing, and the hills will answer;

Sigh, it is lost on the air.

The echoes bound to a joyful sound,

But shrink from voicing care.

Rejoice, and men will seek you;

Grieve, and they turn and go.

They want full measure of all your pleasure,

But they do not need your woe.

Be glad, and your friends are many;

Be sad, and you lose them all.

There are none to decline your nectared wine,

But alone you must drink life's gall.

Feast, and your halls are crowded;

Fast, and the world goes by.

Succeed and give, and it helps you live,

But no man can help you die.

There is room in the halls of pleasure

For a long and lordly train,

But one by one we must all file on

Through the narrow aisles of pain. 

by Ella Wheeler Wilcox, published on February 25, 1883 

Your brain

سافر تجد عوضا عمن تفارقه

ما في الــمقام لـذي عـــــقـلٍ وذي أدبٍ****من راحـــــــة فـدع الأوطـان واغتـرب

 ســـــــافر تجـد عوضـاً عمـن تـفارقـه****وانـصب فإن لذيذ العيش في النصـب

 إني رأيـت وقـــوف الــمـاء يفســــده****ان ساح طاب وإن لم يجـر لم يـطــب

 والأسد لولا فراق الأرض ما افترست****والسهم لولا فراق القـوس لم يصـب

والشمس لو وقفت في الفلك دائمـه****لملها الناس من عــجـم ومـن عــــرب

والـبدر لــولا أفــــول منه ما نظرت إليه****في كـــل حــين عــين مــرتقــب

والــتبر كالــترب ملقـي فـي أمــاكنـه****والعــود في أرضــه نـــوع من الحطـب

فــإن تــغـــرب هـذ ا عـز مــطلـــبـه****وإن تــغــــرب ذلـك عــــــــز كالـذهـب 

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الامام الشافعي (ماأكيد) .. سمعت الشعر لأول مرة من الرحالة احمد الشهاوي 

انصب = اتعب واجتهد 

ساح = جرى 

أفول = غياب

مرتقب = من يترقب ظهوره

التبر = الذهب غير المصوغ او المضروب 

عز = إمتنع

Notch filter Lt spice

This is what i am working on right now a 3rd order inverted filter. well i am trying to figure out the correct component values to have a 500Hz notch filter . while using f = 1 / 2*pi*R*C .
R=R1=R2. R3=.5*R
C=C5=C6 . C4=2*C

it is strange that the graph isn't giving me notch graph. Perhaps i did something wronge

CAN

http://www.aa1car.com/library/can_systems.htm