Bluetooth, the Undercurrent

There are hundreds of Bluetooth devices working around us, and we did not even recognize they are exits.

Scanning Bluetooth

The scan app on my phone allows me to scan the Bluetooth device around. I use Bluesee and scan in the subway station, more than 600 devices on air!

Same testing at home. A mobike is detected, which is a shared bicycle using QRcode to get the bike information, and then use Bluetooth to communicate and unlock.

The mobike over the street

Arduino

Arduino BLE library has a great example to illustrate the process of how to create peripheral devices and a center device on two Arduino microcontrollers separately.

After programming, these devices also could be detected in Bluesee, also could change the characteristics in the Bluesee app.

Communicate to web

Using Bluetooth to control a web service is a little bit easier. There is a built-in function on the page, allow users easily to pair the target device. Which is great!

However, in the process experiments, some questions came along.

• UUID set for the service or it is set for the characteristics?
• Sending multi characteristics from the Arduino is failed?
• What parameter determines the connectability of the device?

Still finding the answer of these questions.