Month: January 2009
Month: January 2009
If you're anything like me, when you run into a little programming problem you just trot down to the library and pick up a couple of books/manuals on whatever it is you need to master. Do a little reading and POW! You've got the tools you need. When I ran into problems with my firstRead More
These are another kind of DC motors ,but with a built in gearing Feedbck System. These servo motors come in many varieties and can from 0 to 180 degrees. Some rotate through a full 360 degrees or more.
They are extremely popular with RC plane,boat and Robots with precision handling like arms and legs.
And most of all these do not need any motor drivers circuits
A thing to note is that servos are unable to continually rotate, meaning they can't be used for driving wheels. There is a modification provided to do so at Society of Robots
Method to Drive a Servo
The servo normally has Three wires with it. Connect the black wire to ground, the red to a 4.8-6V source, and the yellow/white wire to a signal generator (such as from your microcontroller). Vary the square wave pulse width from 1-2 ms and your servo is now position/velocity controlled.
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Here we plan to list and describe some of the free & unknown software that can be used in place of famous & properitory software. OpenOffice-Openoffice is substitute to Microsoft office.It is open source and cross-platform. Gimp/GimpShop– A substitute to Adobe Photoshop which is an image editing tool. OpenLazio– An Adobe Flash like softwareRead More
Linux is an open source operating system.Linux is free.Linux being open source gives us advantage of customizing the linux and creating our own version.Various flavours of Linux have already evolved.Eg. Ubuntu evolved from Debian.Edubuntu(Educational version of Ubuntu) evolved from Ubuntu. To customize linux we have to tinker with source and recompile the kernel. Below areRead More
1. Nmap I think everyone has heard of this one, recently evolved into the 4.x series. Nmap (”Network Mapper”) is a free open source utility for network exploration or security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel waysRead More
Military equipment, toys, communication, home electronics, computing, cars, satellites and others. This is only a partial list of products, which contain electronics.
Actually electronics won our world. We wake up with the ring of electronic clock, drink coffee from a electronic coffee machine, work with computers, learn by using video conferences, listen to the music from a sound system and go to sleep while adjusting our electronic watch for tomorrow morning.
It is hard even to think that only a hundred years ago our world seemed different at all from this point of view. But how did the electronics revolution begin? Which research and discovery was the basis for this modification? Why was it so fast, relatively to other developments in history? Let us Try to Answer these questions.
Theoretical and experimental studies of electricity started in the 18th and 19th centuries enabled the development of the first electrical machines and the wide use of electricity. During that time the first theory was founded and the rules of electricity was formulated. The event of identification of the electron in second half of 19th century by the English physicist J.J. Thompson and the measurement of its electric charge in 1909 by the American physicist A. Millikan were the point of turning the electronics evolution separately from that of electricity. Another coarse of interest to electronics was the observation of the American inventor Thomas A. Edison. He noticed that the current of electrons would flow from one electrode to another, if the second one was with relatively positive charge. This discovery led to the development of electron tubes. Electron tubes became very useful for manufactory at that time. X-ray tube, the radio signal detectors and transmitters, and the first power systems were based on electron tubes. The development of the vacuum tube and later the three-electrode tube by adding the grid between the anode and the cathode (Negative and positive electrodes in the tube) improved the characteristics of the tube by far and made it more useful for different electronic applications.
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You may have come across several websites on the internet,they run on a webserver.A Web server is a computer program that delivers (serves) content, such as Web pages, using the Hypertext Transfer Protocol (HTTP), over the World Wide Web. Generally to create webserver either Apache or IIS is used.Apache is a free software under GPLRead More
Introduction When exploring a network for security purposes, you usually want to know more than the bare IP addresses . Sometimes you may find a printer or sometimes a router ,telephone PBX,Windows Destop or Linux Server.If you know the version of OS or other details then it may be useful for determining vulnerabilities with respectRead More
Nmap has been created by Fyodor.It is a major security tool.The Nmap includes features like port scanning,TCP Scan,UDP Scan,Syn Scan,OS Fingerprinting. In this article we will cover some basic nmap features: First go to nmap.org and download nmap & install it. Then go to command prompt & type nmap. This will show youRead More
In Linux you can mount a partition by giving the mount command. Eg. mount /dev/hda1 /mnt/c This means that the device /dev/hda1 can be accessed from the /mnt/c directory.But instead of typing this again and again every time we log in. There is a better solution.We put this in /etc/fstab. So thatRead More