← Years 5–6 Digital Systems

Bluetooth for short-range transfer

A wireless technology that sends data between two nearby paired devices, such as a phone and headphones, over a short range.

Part of: 5-6 Digital Technologies Vic Curric - Digital Systems & Security — Module 24, 7-8 Digital Technologies Vic Curric - Digital Systems and Security — Module 29, ACARA Digital Technologies Years 7–8 — Wired and Wireless Networks — Module 19

Understanding Bluetooth for short-range transfer in Years 5–6 Digital Systems

What it does: Bluetooth only reaches a short distance (about 10 metres), so a check that devices are close shows its short range. A phone sends sound data wirelessly to a paired speaker or headphones, which is a common use of Bluetooth. Pairing connects the two devices so they can trust each other and send data over Bluetooth. Speakers and headphones often use Bluetooth. Websites from far away are reached over the internet, not Bluetooth. Bluetooth pairs nearby personal devices such as tablets and headsets.

Common mistakes: Bluetooth pairs two nearby devices directly, such as a phone and a speaker. A router is for networks like Wi-Fi. It should be 'pair phone with speaker'. Bluetooth only works over a short range, about 10 metres. A range of 10000 metres is far too long. It should be 'range_m = 10'.

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This module's key terms are also in a printable crossword (Modules 21–30) and word search (Modules 21–52).

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Learning
Duo
Which describes Bluetooth best?
Wireless data transfer between two nearby paired devicesWired data transfer between two far apart devices
Matches
phone.send(speaker) # not paired yet
↓
The devices have not been paired, so Bluetooth cannot send data between them. Pair them first.
Applying
Meanings
Term
Bluetooth
Meaning
A wireless technology that sends data between two nearby paired devices, such as a phone and headphones, over a short range.
Practice
Bluetooth sends data wirelessly
Testing
Gaps
(phone, headphones)
Check Answer
Spots
2turn on Bluetooth on speaker
3pair phone with a router

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Quick Questions

1. Which describes Bluetooth best?
A. Wired data transfer between two far apart devices
B. Wireless data transfer between two nearby paired devices ✓
Bluetooth is a wireless technology that sends data between two paired devices that are close together.
2. Before a phone can send music to Bluetooth headphones, what must happen first?
A. The two devices must be paired ✓
B. The headphones must be plugged into a router
Pairing connects the two devices so they can trust each other and send data over Bluetooth.
3. Which range does Bluetooth usually work over?
A. Short range, like within the same room ✓
B. Long range, like across a whole city
Bluetooth is designed for short range, so devices need to be close to each other.
4. Which is an example of Bluetooth being used?
A. A phone playing music through a wireless speaker ✓
B. A computer loading a website from a server in another country
Speakers and headphones often use Bluetooth. Websites from far away are reached over the internet, not Bluetooth.
5. True or false: Bluetooth needs a cable between the two devices.
A. True, it needs a cable to carry the data
B. False, it sends data wirelessly ✓
Bluetooth is a wireless technology, so no cable is needed to send data between paired devices.

Match the Pairs

Bluetooth → A wireless technology that sends data between two nearby paired devices over a short range
pair(phone, headphones) → Connects two nearby devices so they can send data to each other using Bluetooth
Bluetooth works over a short range, so the devices must be close together → distance < 10
Headphones and speakers use Bluetooth to receive sound wirelessly from a paired phone → phone.sendAudio(speaker)
phone.send(speaker) # not paired yet → The devices have not been paired, so Bluetooth cannot send data between them. Pair them first.
headphones.connect(phone, distance=500) → Bluetooth is short range, so 500 metres is far too long. The devices must be close, about 10 metres or less.

Key Term

Bluetooth
A wireless technology that sends data between two nearby paired devices, such as a phone and headphones, over a short range.

Fill in the Blanks

1. pair(phone, headphones)
Hint: Type the action that links two Bluetooth devices so they can connect.
2. connect(phone, speaker, Bluetooth)
Hint: Type the name of the wireless technology used between two nearby devices.
3. distance = 5 if distance <= maxRange: sendAudio(phone, speaker)
Hint: Type the comparison operator that checks the distance is within the short range.
4. paired = True if paired: sendAudio(phone, speaker)
Hint: Type the Boolean value that shows the devices are already paired.
5. sendAudio(phone, headphones)
Hint: Type the name of the device that sends the audio to the headphones.

Spot the Error

Question 1
A turn on Bluetooth on phone
B turn on Bluetooth on speaker
C pair phone with a router
D play music from phone
Line C — Bluetooth pairs two nearby devices directly, such as a phone and a speaker. A router is for networks like Wi-Fi. It should be 'pair phone with speaker'.
Question 2
A range_m = 10000
B distance_m = 3
C if distance_m <= range_m:
D print("Connected")
Line A — Bluetooth only works over a short range, about 10 metres. A range of 10000 metres is far too long. It should be 'range_m = 10'.
Question 3
A connection = "cable"
B paired = True
C if paired:
D send("song")
Line A — Bluetooth sends data wirelessly, with no cable. The value should be "wireless".
Question 4
A device = "headphones"
B found = True
C pair(device
D play("music")
Line C — The function call is missing its closing bracket. It should be 'pair(device)'.
Question 5
A turn on Bluetooth
B search for devices overseas
C select headphones
D pair
Line B — Bluetooth has a short range, so it searches for nearby devices, not ones far away. It should be 'search for nearby devices'.

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