[Quick Explanation] Bluetooth is actually interesting! The mechanism and history

2022.11.25

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table of contents

1 What is Bluetooth? (This is a farce)
- 1.1 The main story begins here
2 The history of Bluetooth is actually long!
- 2.1 ※Extra: The origin of Bluetooth
3 References

nice to meet you

I'm currently working in the Systems Solutions Department as an apprentice engineer

This is my first time writing a blog, so
I apologize for the immature writing, but I hope you will read it with an open mind.

What is Bluetooth? (This is a farce)

Suddenly,

What is "Bluetooth"?

What would you answer if asked this question?

A few months ago, I would have answered like this

"Hmm, maybe something to plug in earphones with?"

Well, I'm not wrong... (whisper)

So, I decided to look into this during an in-house study session

The main story begins here

Well, that was a long introduction, but now we'll get to the main story

Bluetooth, in a nutshell

"A standard for exchanging data and commands without using cables."

This is what I mean

For wired communication

Up until now,
devices
have been connected primarily via cables (leaving aside things like infrared communication).

Specifically, the process was as follows:

When using a "serial cable" to connect a PC to its peripheral devices,
a "COM port" is required on the PC side and a "connector" on the device side.

The connector on the device side has two built-in components:
1. Level converter: Adjusts the voltage level
. This is because the voltage differs between the device and the PC, so without this, the device may malfunction or be damaged.

②UART: Used to connect to a microcomputer.
→ To explain in more detail, it is a component that converts the following signals:
a. Serial communication (a method of sending data one bit at a time, sequentially)
b. Parallel communication (a method of sending multiple data signals simultaneously in parallel over each communication link)

Even just one cable contains a lot of different things

For wireless communication

The above can be replaced with the following:

①Level converter → Bluetooth module
②Device connector and serial cable → Bluetooth stack

Also, a physical COM port is not required on the receiving PC, but instead a virtual COM port is installed

In this way, various things have been replaced in order to eliminate one cable.
I am truly grateful to the person who thought of this. Being cable-free is a great help. Thank you.

The history of Bluetooth is actually long!

1994: Started as an internal project at Ericsson
1998: Launch of "Bluetooth SIG"
1999: Ver.0.8 announced
December of the same year: Ver.1.0b announced
2002: Ver.1.1 announced
2003: Ver.1.2 announced
2004: Ver.2.0 announced *Four new promoters join in
2007: Ver.2.1 announced *Pairing function introduced here
2009: Ver.4.0 announced *Power saving
2016: Ver.5 announced *High speed

I thought it was a recent technology, but I
didn't realize it had such a long history...

However, it seems that the current functionality has only been available for the last 10 years or so

※Extra: The origin of Bluetooth

The word Bluetooth literally translates to "blue tooth."

This is the nickname of a Danish king from long ago named Harald Bråtan Gormsson I.
He united Norway and Denmark through negotiations without bloodshed. His dead teeth were said to be a bluish-gray color.