[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

aspiring engineer in training
I'm Hota from the Systems Solutions Department, an

This is my first time writing a blog, so
I apologize for any clumsy writing, but I would appreciate it if you could read it with a kind eye.

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,
connecting devices has
primarily involved using cables. (Let's set aside infrared communication for now.)

Specifically, the process was as follows:

When using a serial cable to connect a PC to its peripherals,
the PC side requires a COM port, and the peripheral side requires a connector.

The connector on the device side has the following two components built in:
① Level converter: This adjusts the voltage level
. This is necessary because the voltage between the device and the PC is different, and without it, malfunctions or damage to the device may occur.

② UART: 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 and in parallel over their respective communication links)

Even just one cable contains a lot of different things

For wireless communication

The above can be replaced with the following:

① Level converter → Bluetooth module
② Connector and serial cable on the device side → Bluetooth stack

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

They've used various alternatives to eliminate just one cable.
I'm truly grateful to the person who came up with this idea. Being cable-free is a huge help. Thank you!

The history of Bluetooth is actually long!

1994: Started as an internal project at Ericsson
. 1998: "Bluetooth SIG" established.
1999: Version 0.8 released.
December of the same year: Version 1.0b released.
2002: Version 1.1 released.
2003: Version 1.2 released.
2004: Version 2.0 released. *Four new promoters joined.
2007: Version 2.1 released. *Pairing function introduced.
2009: Version 4.0 released. *Power saving improvements.
2016: Version 5 released. *Speed improvements.

I thought myb was a relatively recent technology, but I
didn't realize it actually has 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 name of a Danish king from long ago, "Harald Brothin Gormson I."
He unified Norway and Denmark peacefully through negotiations. It is said that his mortal teeth were a dark blue-gray color.