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How To: The Hardware Hacker's Introduction to Microcontrollers, Part One: Anatomy of an Arduino

In this article, I'll be explaining the basics of how microcontrollers work, physically and virtually. First off, microcontrollers are no simple thing, so don't be discouraged if you find it mind-boggling! The world of microcontrollers is fascinating, engaging, and an awesome hobby; it never gets boring. I'll be focusing more on I/O and analog based microcontrollers, such as those running Arduino, and using Atmel chips as examples (these are most commonly available, and easy to program).

SQL Injection 101: How to Avoid Detection & Bypass Defenses

It is often said that the best hackers remain unknown, and the greatest attacks are left undiscovered, but it's hard for an up-and-coming penetration tester or white hat to learn anything unless one of those factors is actually known or discovered. But the end goal here in our SQL injection lessons is to make that statement as true as possible for us when performing our hacks.

How To: Draw Spongebob

Today we're going to draw Spongebob! He's going to be facing forward, so even beginners should find drawing this guy to be a piece of cake! 1) Begin by sketching out a rectangle with a broader top and a narrow bottom, make sure it's not too skinny though. This will be the base of Spongebob's body.

How To: Play home run derby

It's summer again and it's time to get out of the house and there's no better way than with a fun game like some improvised baseball. You don't need a whole team of people all you need is a bat, a ball and another person to play with.

How To: Graph the slope of a line through two points

If you want to learn how to get and graph the slope of a line using two points, you should watch this. 1. Let your two points be (x1 , y1) and (x2 , y2). Draw a straight line that connects the two points. 2. Use the formula, m = change in y over change in x , for finding the slope which is represented by the variable m. 3. The simpler form of the formula would be m = (y1 - y2) / (x1 - x2). 4. If you were given two points, just substitute the values in the given formula. 5. For example, the tw...

How To: Find the area of a parallelogram using geometry

The video shows us how to find the area of parallelogram using geometry. Here in this video it is done by using an example where the parallelogram is given ABCD. The area of the parallelogram is base times height (bh). Here the base is given as 15 but the height is not known but it is represented by the segment BD. To find the value of h, let’s use right triangle BDC on the right side of the figure. Since base is 15 and the opposite side of the parallelogram is congruent, the hypotenuse of th...

How To: Use repeat (REPT) function in Excel

There are many functions in Microsoft Excel. One function that people rarely use is the Repeat function or REPT. In this video, an example used is a chart of people and their sales of a certain item. Just looking at the numbers, it is hard to compare the different sales easily, but a more visual approach may work better. Next to one of the cells, type in "=REPT(" which is the repeat function. A popup should say "=REPT(text, numbertimes)". For "text", type in *** or anything, really. For "numb...