LED - Light Emitting Diodes

Discussion G³

Lesson: Light Emitting Diodes

LED with electroluminescence are semiconductor components encased in an epoxy lens in a circuit that produce light. Anvil and post are positive and negative, respectively. When forward biased switched-on, electrons recombine with electron holes, releasing energy in the form of photons. These components are utilized in computers as indicators. LEDs are bright with a frequency range from ultraviolet through infrared. LEDs have an exponentially longer life than incandescent bulbs and consume much less energy.

Check out the infinite uses of LED technology.

ASCII

Discussion F³

Lesson: ASCII Code

ASCII Code is a universal standard utilized in computing. The acronym ASCII means American Standard Code for Information Interchange. When you press a keyboard key, an interrupt signal is sent to the computer’s processor, which prioritizes your action and memorizes the sequence of each keystroke as a preference. The position of alphanumeric characters is predetermined by ASCII. With each keystroke a byte of memory is devoured.  (Count eight bits [0,1] to a byte.) When you type ‘shift A’, it translates to 01000001 and ‘lowercase a’ is 0110001. These zero and one sequences are the way your computer understands your preferences.

Please Google: ASCII to view the ASCII table which includes binary and hexadecimal translations for each keyboard key.