[Simply explained] It's actually interesting! ? How Bluetooth works and history

nice to meet you.

am an apprentice engineer

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

What is Bluetooth (*This is a farce)

Suddenly,

What is "Bluetooth"?

How would you answer if asked?

A few months ago, I would have answered:

 

 

"Hmm, do you have something to connect your earphones to?"

 

 

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

From this point of view, I took the opportunity of an in-house study session to investigate this issue.

Main story starts here

Well, the introduction is long, but let's start the main part.

Simply put, Bluetooth is

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

It means.

 

For wired communication

Until now,

cables were basically used to connect devices (Let's leave things like infrared communication for a moment.)

Specifically, the process was as follows.

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

The following two connectors are built into the device side connector.
① Level converter: A device that adjusts the voltage level
→ Since the voltage differs between the device and the PC, without it there is a possibility of malfunction or damage to the device.

②UART: A device for connecting to a microcomputer
→ To explain in more detail, it is a component that converts each of the following signals:
a. Serial communication (a method of sending data sequentially, one bit at a time)
b. Parallel communication (a method of sending data sequentially, one bit at a time (method of sending simultaneously and parallelly through each communication link)

Even just one cable contains a lot of things.

For wireless communication

Each of the above will be replaced with the following:

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

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

In this way, you can replace one cable with a variety of other things.
I'm really grateful to everyone who thought about it. Being cableless is helpful. thank you.

 

It’s actually long! ? History of Bluetooth

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

I myself thought it was a recent technology, but
I had no idea it actually has this much history...

However, in reality, it seems that the current functionality has only been available in the last 10 years.

*Extra: Origin of Bluetooth

The literal translation of the word Bluetooth is "blue teeth."

This is the ancient name of the Danish king Harald Brotan Gormson I.
He negotiated a bloodless union of Norway and Denmark. It seems that his dead tooth was blue-black-gray.

For this reason, it was named with the desire to unify the wireless communication standards that existed at the time.

Study session materials

 

References

Kogakusha, 2021, Oto Takimoto “Understand the basics of Bluetooth” 3rd edition”

Bluetooth SIG official website
https://www.bluetooth.com/