science

LED to LED communication

LED to LED communication is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand LED to LED communication rather than just read about it. In short: LED (Light-emitting diode) to LED communication, also known as “Mobile Device Light Communications” are sundry techniques which repurpose mobile computer devices, including mobile telephones, to communicate with other devices, using visual or infrared light. “Mobile device light communication” differs from Visual Light Communication as “mobile device light communication” transmits data at speeds thousands of times s…

Key takeaways

LED to LED communication belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect LED to LED communication to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of LED to LED communication from memory before moving on to harder problems.

Reference excerpt

LED (Light-emitting diode) to LED communication, also known as “Mobile Device Light Communications” are sundry techniques which repurpose mobile computer devices, including mobile telephones, to communicate with other devices, using visual or infrared light.

“Mobile device light communication” differs from Visual Light Communication as “mobile device light communication” transmits data at speeds thousands of times slower than Li-fi. “Mobile Device Light Communication” takes various forms:

The mobile device flashlight LED (also called the camera flash LED) can send visual light signals in the form of white light flashes. The mobile device infrared proximity emitter and sensor can send infrared flashes and receive infrared flashes. The liquid crystal display (LCD) or LED display of the mobile device can send visual light signals in the form of colored display flashes. A color sensor, or an ambient light sensor, or a reverse biased LED can receive flashes from the mobile device, and send flashes back to the infrared light sensor on the mobile device. Picalico exploits the features of two iOS mobile devices. Light Message also does so for Android. Light communication is low cost, since the hardware for mobile light communication is often already a component of the mobile device assembly. Adding the capability of receiving mobile light communication to electronic gadgets is also low cost, since a reverse biased LED or color sensor chip costs very little. Mobile device light communication is orders of magnitude slower than Bluetooth, or Li-fi. It is suitable for low cost basic mobile telephones that lack Bluetooth or iBeacon, or as a backup communication system, when Bluetooth fails. Mobile device light communication is the basis for the German banking ATM system flicker code procedure. Since many electronic devices have a display or LEDs, light communication can be added to these devices. Devices like CRT monitors, tablets, watches, laptops, LED flashers, wristbands, and other gadgets with displays or LEDs can accommodate mobile light communication. Bg-fi is a mobile light JavaScript which can be adapted to devices running Java. Mobile device light communication is described in patents 5136644 Archived 2015-09-21 at the Wayback Machine, 5488571, 5742260, 6977868, 20090232515, 20140082076, EP1211841B1, EP1788509A1, GB2376115A1, WO2011007380A1, and by patents pending.

See also Flicker code IrDA HP SIR / Red Eye protocol Consumer IR Li-Fi

References

Illustrations

LED to LED communication: A sending LED emitting a flash of light. — A sending LED emitting a flash of light.

Worked examples

Example 1 — a first encounter with LED to LED communication

Start with the simplest possible case. Write down what LED to LED communication claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to LED to LED communication before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about LED to LED communication ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of LED to LED communication

In research: LED to LED communication appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses LED to LED communication in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: LED to LED communication is common in secondary-school and first-year university syllabi. It links to neighbouring topics Light-emitting diodes, Telecommunications techniques, so understanding it makes those chapters shorter.
In everyday life: Look for LED to LED communication outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study LED to LED communication in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what LED to LED communication means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain LED to LED communication out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is LED to LED communication in simple terms?

Why does LED to LED communication matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study LED to LED communication?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on LED to LED communication.