A beginners guide to hacking computer systems

... discuss creating the physical database in Microsoft Access. 2 Concepts of Creating a Database A database is a collection of information typically stored on a computer. A database can be ... of as an electronic filing system. One type of database, and the type discussed here, is a relational database. A relational database is a collection of tables with...

Ngày tải lên: 16/03/2014, 16:20

... Beginner's Guide to Charting Financial Markets A Beginner's Guide to Charting Financial Markets 26 There are many complex shapes to analyse but let’s just keep with the basics. Each is named ... connection, and the same applies to any tool investors may choose to use. A brief history of charting Chart watching can trace its roots back more than 200 ye...

Ngày tải lên: 03/05/2014, 12:54

... used to write PicBasic programs are products and trademarks of microEngineering Labs, Inc.) PicBasic is similar to the PBasic language used in programming the Basic Stamp series. Programming ... Robotic Arm 215 Adding a Robotic Arm Base 216 Parts List 223 Chapter 13. Bipedal Walker Robot 225 A Question of Balance? 226 A Little Feedback 227 Servomotors 227 This page inte...

Ngày tải lên: 22/05/2014, 18:13

... 91 97 99 10 0 10 1 10 4 10 7 10 9 11 2 11 4 11 5 12 1 12 1 12 1 12 1 12 1 12 3 12 3 Building a Walter Tortoise Drive and Steering Motors Modifying the HS-425BB Servomotor Sheet Metal Fabrication ... Installing the PicBasic Compiler Software 11 Installing the PicBasic Pro Compiler 12 Chapter 3. Installing the EPIC Software 19 Installing the EPIC Softw...

Ngày tải lên: 10/08/2014, 04:22

... wink.bas The compiler reads the text file and compiles two additional files, an .asm (assembly language) and a .hex (hexadecimal) file. The wink.asm file is the assembly language equivalent to the ... simple. To install, run the install.bat file on the 3.5-in EPIC diskette. The install.bat file exe- cutes the main self-extracting program that automatically creates a...

Ngày tải lên: 10/08/2014, 04:22

... cable. When you connect the EPIC programming board to the computer, there should not be any microcontroller installed onto the board. If you have an ac adapter for the EPIC programmer board, ... into the programming board socket until the EPIC program- ming software is running . The EPIC Programming Board Software There are two versions of the EPIC software: epic.exe for...

Ngày tải lên: 10/08/2014, 04:22

... command to communicate and output mes- sages to the LCD display. The PicBasic and PicBasic Pro compilers can send and receive serial information at 300, 1200, 240 0, and 9600 Bd. Data are sent as ... breadboard. 4 (MCLR), a 4- MHz crystal with two (22-pF) capacitors and a 5-V power sup- ply. Note: The 4- MHz crystal and two (22-pF) capacitors make up an oscillator that is...

Ngày tải lên: 10/08/2014, 04:22

... allow the robot to travel and move around the house in a random manner. The idea is that while traveling in a haphazard manner, it will eventually make its way throughout the rooms, cleaning the ... out- put pins and then access them in our programs. There are other commands you can use to accomplish the same thing. The PicBasic and PicBasic Pro compilers have two ba...

Ngày tải lên: 10/08/2014, 04:22

... file away these tabs so that the servomotor can be mounted flush against the bracket (see Fig. 8.23). Next mount the ser- vomotor to the U bracket, using 6- 32 machine screws and nuts. Attach the ... Building a Walter Tortoise We can imitate most functions in Walter’s famous tortoise. My adaptation of Walter’s tortoise is shown in Fig. 8.1. To fabricate the chassis, w...

Ngày tải lên: 10/08/2014, 04:22

... first look at how the standard program functions. Fudge Factor The variable RV (range value) is the fudge factor. At the beginning of the pro- gram the variable RV is assigned a value of 10. ... robot that matches, as best as one can match them, in resistance. Since the resistance value of the CdS cells can vary so greatly, it’s a good idea to buy a few more than you...

Ngày tải lên: 10/08/2014, 04:22

... vehicles. The gearbox motor is a 918D type (see Fig. 9 .8) . The gearbox motor at the top of the picture has an orange cowl that is covering the gears. Notice the flat mounting bracket that is perfect ... 9.9). The second gearbox motor is secured to the other side in a similar manner. Back wheels The shaft diameter of the gearbox motor is a little too small to...

Ngày tải lên: 10/08/2014, 04:22

... aluminum bar 90 °. Don’t go fast, or you could easily snap the aluminum bar . Repeat the twist on the other side. After the two 90 ° twists have been made, make the other 90 ° bend for the legs, as ... microcontroller as well as the servomotors. The battery pack is a 16-V unit using four AA batteries. The microcontroller circuit may also be built on a small print...

Ngày tải lên: 10/08/2014, 04:22

... less than the interface board containing 10 relays. The advantage of the relay board is that the miniature power relays have enough current capacity to directly control small dc motors and other ... consideration was the type of output that the interface board should provide. Here was a tough choice. I had the option to make the output an active high signal that th...

Ngày tải lên: 10/08/2014, 04:22

... lift the arm and any object the arm is holding. Figure 12.17 shows how the servomotors are attached to the gripper. Assemble one part A and B bracket, as shown in Fig. 12.18. Attach a ser- vomotor ... read this as a position error and will increase its torque in an attempt to rotate the shaft back to its command position. Hobby servomotor specifications usually s...

Ngày tải lên: 10/08/2014, 04:22

... back over your shoulders for narcs and cops. What we're talking about is hacking as a healthy recreation, and as a free education that can qualify you to get a high paying job. In fact, ... HACKING INTO COMPUTER SYSTEMS A Beginners Guide Guides of the Beginner's Series: So you want to be a harmless hacker? Hacking Windows 95! Hacking...

Ngày tải lên: 20/10/2014, 14:43