computer science

XBee

XBee is a computer 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 XBee rather than just read about it. In short: Digi XBee is the brand name of a popular family of form factor compatible wireless connectivity modules from Digi International. The first XBee modules were introduced under the MaxStream brand in 2005 and were based on the IEEE 802.15.4-2003 standard designed for point-to-point and star communications.

Key takeaways

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

Reference excerpt

Digi XBee is the brand name of a popular family of form factor compatible wireless connectivity modules from Digi International. The first XBee modules were introduced under the MaxStream brand in 2005 and were based on the IEEE 802.15.4-2003 standard designed for point-to-point and star communications. Since the initial introduction, the XBee family has grown and a complete ecosystem of wireless modules, gateways, adapters and software has evolved. The XBee radios can all be used with the minimum number of connections — power (3.3 V), ground, data in and data out (UART), with other recommended lines being Reset and Sleep. Additionally, most XBee families have some other flow control, input/output (I/O), analog-to-digital converter (A/D) and indicator lines built in. The latest XBee 3 family introduces new capabilities like MicroPython, Digi's TrustFence security framework and Bluetooth low energy for local commissioning, configuration, diagnostics or beaconing

Supported technologies Short Range (2.4 GHz)

Zigbee, IEEE 802.15.4, DigiMesh, Bluetooth Low Energy Long Range (868/900 MHz)

Point-to-Point, Star topology, DigiMesh Cellular / LPWAN

LTE Cat-1, LTE-M / Narrowband IoT, 3G

Form-factors, antennas and data modes XBee modules are available in three form-factors. All XBees, with the exception of the XBee 868LP, are available in the popular 20-pin through-hole form-factor. The latest XBee modules are also available in surface-mount and micro-mount form-factors, which are popular for high-volume applications due to the reduced manufacturing costs of SMT.

through-hole (TH) surface mount (SMT) micro-mount (MMT) XBee modules typically come with several antenna options, including U.FL, on-board chip, RF pad and integrated PCB XBee modules can operate either in a transparent data mode or in a packet-based application programming interface (API) mode.

Transparent mode: data coming into the Data IN (DIN) pin are directly transmitted over-the-air to the intended receiving radios without any modification. Incoming packets can either be directly addressed to one target (point-to-point) or broadcast to multiple targets (star). This mode is primarily used in instances where an existing protocol cannot tolerate changes to the data format. AT commands are used to control the radio's setting API mode: data are wrapped in a packet structure that allows for addressing, parameter setting and packet delivery feedback, including remote sensing and control of digital I/O and analog input pins.

Product family As of March 2020, the Digi XBee portfolio includes

Short Range (2.4 GHz) XBee 3 (newest family featuring integrated Bluetooth low energy, MicroPython and TrustFence security framework) 802.15.4 - point-to-point topology or star topology based on the IEEE 802.15.4 protocol Zigbee - standards-based mesh networking based on the Zigbee protocol DigiMesh - sleeping mesh networking protocol developed by Digi International XBee Series 2 (mature family, not recommended for new designs) 802.15.4 / Zigbee / DigiMesh (see descriptions above) Long Range (900/868 MHz) XBee SX 900 / 868 point-to-point topology, star topology or mesh networking based on DigiMesh protocol High power (up to 1-Watt) for extreme RF line-of-sight range up to 105 km (65 miles) Low power (+13 dBm / 20 mW) for EU and battery-optimized applications XBee 868LP/900HP point-to-point topology, star topology or mesh networking based on DigiMesh protocol Cellular / LPWAN XBee 3 LTE Cat-1 XBee 3 LTE-M / NB-IoT XBee 3G

See also Bluetooth Zigbee LTE-M Narrowband IoT Comparison of wireless data standards

References

External links

Official Digi XBee Website XBee on Arduino Blog XBee Project Gallery XBee Examples Site

Illustrations

Worked examples

Example 1 — a first encounter with XBee

Start with the simplest possible case. Write down what XBee claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer 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 XBee 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 XBee 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 XBee

In research: XBee appears in computer 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 XBee 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: XBee is common in secondary-school and first-year university syllabi. It links to neighbouring topics Internet of things, Wireless sensor network, so understanding it makes those chapters shorter.
In everyday life: Look for XBee 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 XBee in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what XBee 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 XBee out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is XBee in simple terms?

Why does XBee matter?

Because it connects several computer 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 XBee?

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 XBee.