I remember my parents bought me in 1974 my first
pocket calculator, a Japanese
SHARP PC-1801 with square roots and scientific functions with a size of 94x148x36mm /
3.7x5.8x1.4 ", a weight of 350 grams and consumption 1.3 W supplied by 5 AA
batteries.
To visualize the results the calculator has,
yes it has because I still have it and works!, an 8-digit numeric display, each consisting of a
7-segment display, type LED of 5mm/0.2 red, as seen in the photo of the calculator.
The
LED displays consumed much 40 years ago and were replaced by
LCD displays with less consume, being curious that although they have nothing to do
with the current flat TV screens, LED technology was replaced by the LCD
during
the first display war, unlike today.
As a 7-segment displays were designed to represent hexadecimal numbers (0-9
and A-F) to represent alphanumeric characters appeared
14-segment displays and arrays of 4x7 and 5x7 LEDs, of which I will not talk in this article because they are more
sophisticated and appeared later.
A game known as
calculator spelling, with 7-segment displays, was to write numbers and see them putting the
calculator upside down to form phrases with the letters of the alphabet, as
the number 0 becomes the letter O,
1 to L, 2 to Z,
3 to E, 4 to
h, 5 to S, 6 to G,
7 to T, 8 to B and 9 to P, this technique was
being used as a slang (
Alphabet 1337 - Leet speak) by the elite of programmers,
geeks and
phone
hackers, to avoid censorship in the first chats (
BBS) that existed in the Internet-80s. You can find a
translator Leet here.
These holidays I plan to design an Excel spreadsheet that can visualize, with
a 7-segment displays, any phrase you enter in alphanumeric mode and a clock
with hours, minutes and seconds.
The result is an Excel 2010 sheet with macros to get the animation of the
clock, refreshed every second, and the shift to the left of the words of the
sentence written in cell
E27 (yellow). In cell
A29 you can write
the number of characters you want to shift to the left each time.
Hit the
play button to begin to see the numbers and letters with
7-segment
display
green or
red better!
We are with the Red!
The Spanish team in the final World Cup South Africa 2010!
If you like it, you can download the file from the following forum link
AyudaExcel:
or from my public disk Google Drive:
Traducción al español
aquí.
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