Bluetooth

Bluetooth is a global open wireless technology standard for exchanging data over short distances (using short wavelength radio transmissions) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security.

Usb

HARDWARE QUESTIONS ARE OFF-TOPIC



Requirements easier commands

Example

"I had previously sent those commands via bluetooth but the connection fails too often to be useful and is slower than usb"

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How to use Visual Basic, Mindstorms NXT and USB communication Altogether?

"It depends on your requirements but setting up a usb connection is sometimes easier than managing a bluetooth connection"

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Serial communication with Windows Phone 8

Others

Example

If your watch doesn t have usb support moto 360 and other induction only charging you need to enable bluetooth debugging slower than through usb though

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Android wear Watch face installs but not shown in faces list

Interfacing with usb is more difficult than it sounds it would be harder to build something which would interface with that and measure millivolts than with bluetooth because the pic processor you use for analog to digital sampling and usb client would in fact have to either act as usb host or usb otg on a phone which is far more complicated than being a usb peripheral

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Reading milliVolts in Android for pH Tester

It works totally fine with usb but not with bluetooth devices while the app is running i turn on bluetooth on both my laptop and mobile phone but they have not paired yet the function gets called and it says bluetooth came then i connect the two devices now they are connected but no notification except the one above after that while they are connected i try to remove the mobile phone device they are disconnected and i connect them back again and one more time i get no notification about a new bluetooth connection has been scanned or connected

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Get bluetooth devices connection notification

On the other hand a usb connection is far more reliable better supported and of course has the inherent advantage of speed and since it is well supported does not suffer from all the pitfalls bluetooth connectivity does

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Android + Arduino project: should I have them talk via Bluetooth or USB?

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