Calculator

Calculator Components

If you've read the prior page, you know by this point that portable calculatorsneed single-chip microprocessors to work. How do you turn on the microprocessor? The first step is to look inside the device.

A lot of modern calculators have a robust plastic casing, featuring small holes in the front of the device that allow rubber to push through, similar to a TV remote. When you press a button, you create a circuit beneath the rubber, which sends electrical signals through a circuit board below. Those impulses are routed through the microprocessor that interprets the data and provides an information readout to the calculator's display screen.

Displays on early electronic calculators were composed of LEDs or luminescent diodes. The latest models that require less power feature a displays made of liquid crystal also known as LCD. Rather than producing light, LCDs alter light molecules to create a pattern on the display . They also don't require as much energy.

Early calculators also needed to be plugged in or used bulky batteries. But by the late seventies, solar cells technology was cheap and effective enough to be utilized in consumer electronics. A solar cell produces electric current when the photons that are released by sunlight are absorbed by semiconductors, like silicon, in the cell. It knocks electrons loose, and the electric field in the solar cell ensures that they are all traveling in the same direction, thus creating electricity. (Something similar to an LCD calculator would require an insignificant amount of current, which is the reason their solar cells are tiny.) Since the 1980s most makers of simple calculators had embraced solar cell technology. The more powerful graphing and scientific calculators but, in reality, make use of battery power.

In the next part we'll dive deeper in binary code, and the way in which the calculator actually performs its job.Hello Beghilos!

Perhaps you've employed an in-pocket calculator at some point to spell words upside-down, for example 07734 ("hELLO"). But did you know that this particular language has a name? It's called "BEGhILOS," after the most frequent letters you can make with a simple calculator display.

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How a Calculator Calculates

As you've seen on the previous pages, the majority of calculatorsdepend in integrated circuits that are also known as chips. These circuits use transistors to subtract and add as well as to perform computations using logarithms to complete division, multiplication and more complicated operations such as using exponents , and discovering square roots. Basically, the more transistors an integrated circuit contains in it, the more advanced the functions it can perform. Most standard pocket calculators come with identical, or very similar circuits.

Like every electronic device, the chips in the calculatorwork to function by decreasing any information you send in to binary. Binary numbers convert our number into the form of a base-two system where we represent each digit by a 1 or a 0and then double every time we move the number. If we are "turning on" each of the positions -- in the sense of putting one in each -you can tell that that digit is part of our total number.

Microchips implement binary logic by turning transistors on and off , literally through electricity. Thus, for instance, if you wanted to add 2 and 2, your calculator will make the individual "2" to binary (which looks like this: 10) and later add them up. Adding one column, the "ones" column (the two 0s), gives you 0: The chip can recognize that there's nothing in the "ones" column in the first place. When it adds the digits in the "tens" column, the chip has 1+1. It determines that both are positive. It then -because there aren't 2's in binary , itmove the positive answer one more digit to the left and gets a total of -- which in binary terms is equal to 4 [source: Wright].

The sum is then routed through the input/output chips in our integrated circuit. This circuit applies the same algorithm to the display. Have you noticed that the numbers on the display of a calculator or an alarm clock consist of segmented lines? Each of these parts of the numbers is toggled on or off with this same binary logic. This means that the processor takes that "100" and translates it through lighting up or turning on certain segments of the lines in the display to make the numeral 4.

In the following page, we'll look at the impact of the calculator's work on the world and the ways we can expect to see them evolve within the future.The Difference Engine

An engineer in the Hessian army initially devised a predecessor to today's computer in 1786. The idea was to create a computer that could print mathematical tables by calculating factors that affect the equations. Because it worked sequentially and automatically, these "difference engines" are considered crucial precursors to the modern computer. The Swedish family of fathers and children team, called the Scheutzes developed a working difference engine in 1853 . It can still be seen on display at the Smithsonian Institute.