Questions tagged [bluetooth]
A low bandwidth, low-power short-range wireless protocol typically used for personal area networks that operates on 2.4GHZ-2.485GHZ.
53
questions
42
votes
4
answers
17k
views
How to synchronize two microcontrollers to micro-second accuracy?
I need to synchronize two micro-controllers so that they can measure the speed of propagating waves. The time delay measurements need have microsecond accuracy (error less that 1/2 of a microsecond).
...
- 523
3
votes
3
answers
3k
views
Car bluetooth power delay- USB capacitor? [closed]
I just bought a bluetooth adapter for my car. It's input is 5V/0.3A and is powered via a 5V/1A USB power adaptor that is plugged into the 12V/10A/120W max. socket in the center console of my 2004 ...
- 97
49
votes
5
answers
125k
views
Is Bluetooth Communication Possible Without Pairing?
I am working on a device which can wirelessly activate a system "instantly". The first thing which came to mind was to use RFID technology which has the advantage of instant and cheap communication. ...
- 5,972
16
votes
5
answers
5k
views
Low Cost Bluetooth
What is the lowest cost way to add a Bluetooth integrated radio to an embedded system?
I am using a BlueGiga WT12 which works well. IIRC these are in the $20-$25 range. Are there comparable modules ...
- 11.8k
7
votes
4
answers
10k
views
Cheapest, simplest way to implement a Bluetooth keyboard/mouse?
Thinking of building a device for sending text and probably mouse movement into a computer, but I want it to be wireless and compatible with many computers/PDAs/phones without a specialized dongle, ...
- 28.9k
5
votes
2
answers
2k
views
Must FCC-certified modules be labelled with the correct FCC ID?
The manufacturer of this radio module I bought claims that it's FCC certified, but there's no FCC ID on it (though there is the FCC logo). If the final product is to be FCC tested, would it then be ...
- 1,557
4
votes
2
answers
19k
views
Arduino and Bluetooth USB dongle
Is it possible to use a mini USB Bluetooth dongle like in the following picture in order to improve my Arduino Uno, so it can comunicate with other Bluetooth devices?
If it is, how can I do that?
- 163
4
votes
3
answers
5k
views
What will I see in oscilloscope when attempting to analyze Bluetooth or Wi-Fi signals?
I would like to know what will show up if I put bluetooth or wifi carrier signal (2.4GHz family) in a say 50MHz oscilloscope? Am I going to see something like a rectangular block? And the only ...
- 63
3
votes
2
answers
47k
views
Transmitting a video stream through a microcontroller
I'm working a a project that currently works well but this year we want to expand it by collecting data from it, independent of its current functions. We have set up an iPad App to control an Arduino ...
- 161
16
votes
6
answers
52k
views
Options for short range distance determination between two objects
I have a project idea in mind, but it involves calculating the distance between two people. I've looked into Bluetooth, RFID, and NFC (unsure about this one), but none appear to offer the accuracy I ...
- 285
8
votes
3
answers
4k
views
Coin cell battery for Bluetooth?
I'm trying to determine which battery to use for my application. I'll be using a class 1 or class 2 Bluetooth (not low energy) module, which requires about ~50/60mA of RX/TX current. In addition, ...
- 81
3
votes
1
answer
953
views
Bluetooth Compliance
After spending too long on the Bluetooth SIG (Special Interest Group) and other websites I still have no idea what is required for selling a Bluetooth enabled product so I'm hoping someone here has ...
- 3,872
2
votes
2
answers
9k
views
A Bluetooth device that will send data to a mobile phone
I want to make a device which will send a data to a mobile phone which is connected using Bluetooth.
Here is the thing: http://www.youtube.com/watch?v=g0qARDGJj1w.
I want something like this. The ...
- 31
2
votes
6
answers
25k
views
HBQ-i7 Bluetooth Chip Identification
I was recently in Hong Kong and decided to purchase a knockoff Airpod to tear it down and see how it was engineered to help me in my own design process. I got to the mainboard and found the single ...
- 102
1
vote
1
answer
2k
views
Using STM32 to transfer a file via bluetooth
So far I have been doing projects with Arduino, RPi, ATtiny etc. But now I have project in mind where these things doesnt seem to suit. I need your help.
OK, now on the project:
I have a file on my ...
- 63
1
vote
4
answers
903
views
what is the best method for device location services
I am working on a side project at home and need a way to detect when an object is in certain rooms of a house. GPS is not practical because the difference between my living room and bedroom would be ...
- 117
11
votes
3
answers
23k
views
Streaming video using BLE or classic Bluetooth 4.0?
BLE only has a data payload of 100Kbps so I was wondering if it is possible to stream a live video using Bluetooth Low Energy?
Classic Bluetooth 4.0 has a data payload of 2Mbps which makes it easier ...
10
votes
3
answers
30k
views
BLE Scan interval and window
With Bluetooth Low Energy, you specify a scan window (how long to scan) and interval (how long to wait between scans).
Would there be any difference between scanning for 10 ms every 100 ms, or ...
- 981
9
votes
5
answers
22k
views
How many active Bluetooth devices can I reliably detect in a single space?
I am engineering a low-cost attraction and hope to use Bluetooth device identification for proximity detection -- i.e. is guest A within range of static location X. Each guest will be given a ...
- 173
7
votes
2
answers
5k
views
Bluetooth power saving mode for ArduinoBT
I'm trying to get my ArduinoBT to be a bit more power friendly, I have it running in a sensor network and it is constantly drawing power. I want to be able to turn off or put the Bluetooth module to ...
Jess
7
votes
2
answers
5k
views
Bluetooth Compliance and Qualification
It seems that all Bluetooth-enabled devices require the Bluetooth SIG Qualification in order to be marketable, but it isn't clear why it's needed so I'm hoping someone here has more experience. I've ...
- 1,557
7
votes
1
answer
8k
views
Bluetooth profiles - What is the hardware difference?
Do all bluetooth chips have the same hardware, or does the hardware that is part of the chip defined by the bluetooth profile that we choose to use?
Thanks!
dididi
6
votes
2
answers
3k
views
How to eliminate Bluetooth noise in electric guitar
After learning more about this problem, I have continued this question here.
I am trying to remove noise from an electric-guitar circuit that I have created called the ArduGuitar. My circuit ...
- 123
6
votes
2
answers
12k
views
Why is the latency so high for Bluetooth audio?
Referring to this, the lowest latencies achieved in Bluetooth audio streaming are around 30-40ms. Given the fact that Bluetooth physical layer data rate is of around 2-3 Mbps and today's Bluetooth ...
- 798
5
votes
4
answers
3k
views
DC motor causing noise on the power line
I've been building a circuit where I'm controlling a motor using a bluetooth module + phone. I've been having some problems, which mostly are fixed (see topic: previous topic).
The main problem I'm ...
- 259
5
votes
1
answer
6k
views
Bluetooth low energy paired vs unpaired communication
I am looking to seamlessly connect multiple slaves to one bluetooth low energy master, however I do not want to go through the process of pairing each individual device. The pairing process takes too ...
- 153
4
votes
1
answer
26k
views
How to scan for all available beacons with BLE?
I'm working with a project which involves Bluetooth Low Energy beacons. Super simple schematic will just broadcast an unique number of the beacon. These beacons are used in a warehouse which is about ...
4
votes
2
answers
21k
views
Is BLE 4.1 backwards compatible to BLE 4.0 ? Can a phone with bluetooth 4.0 talk with a mote with BLE4.1?
BLE 4.1 is out and it could be considered the biggest news for internet of thing developers. I want to know if my mote with BLE 4.1 can interact with iPhone 6 which has Bluetooth 4.0.
4
votes
2
answers
11k
views
adding a yagi antenna to a bluetooth dongle
I want to set up a Bluetooth link between devices that are over 2000 feet apart. Yagi antennas for 2.4GHz that can connect to routers are available. A cheap Bluetooth dongle that can be easily taken ...
- 41
3
votes
1
answer
1k
views
Power Consumption for BLE advertisements
I have a set of voltage readings that are read at a high rate and they have produced voltage data for power consumption while: advertising events, for connection events, and for no activity. I've ...
- 143
3
votes
1
answer
1k
views
At which point and how to connect VNA on the PCB for antenna tuning?
I am working on a 2.45 GHz(Bluetooth) project. I have used a ceramic chip antenna with 50 Ω impedance for this board.
I've placed a Pi network close to the antenna and also I have used an integrated ...
- 51
3
votes
3
answers
3k
views
Does Bluetooth range increase with lower baud rate?
I am using two Bluetooth dongles for an Arduino project of mine. I am only sending a single int over the connection so it does not need to have a high baud rate.
If I use a baud rate of 1200 will ...
- 5,313
2
votes
1
answer
333
views
Powering Atmega, DAC and Bluetooth in Car
I'm looking for a proper power supply schematic which would fit my needs and would have all required protections (overcurrent, overvoltage, reverse current, etc) for use in car. I want to power Atmega ...
- 189
2
votes
2
answers
6k
views
Does Bluetooth LE stack supports A2DP profile?
Does Bluetooth LE stack supports A2DP profile (audio steaming)? or if there is any dual mode stack which I could use in combination with BLE and classic stack.
Also any information on the hardware ...
- 31
2
votes
2
answers
27k
views
Can an iphone/android cell phone communicate with RFID?
Is it possible for a cell phone to communicate with an RFID chip?
I'm looking for a low-powered solution to turn a device on/off wirelessly, using a cell phone.
Example: phone sends signal to RFID ...
- 21
2
votes
1
answer
589
views
Two 2.4GHz radio modules (XBee+Bluetooth) on same PCB. How to minimize interference?
I'm designing a PCB with XBee radio module and a bluetooth module (RFDuino SMD with XBee 2mW Radio). Since both of these modules are using 2.4GHz, are there any special consideration about how to ...
- 135
2
votes
4
answers
672
views
Certifications and requirements
I am developing a portable device embedding sensors, Bluetooth, MCUs etc.. At present I'm at a prototype stage and I'm starting thinking about production.
What kind of certification steps do I need to ...
- 399
2
votes
1
answer
2k
views
Arduino & JY-MCU Bluetooth module
I've got a bluetooth module from dx and connected it to my Arduino UNO R3. It was working just perfect but after a couple of hours of work it just stopped sending data.
I think, the problem is with ...
- 229
2
votes
1
answer
5k
views
how do I change baud rate for bluesmirf without connecting to pc?
Hi I have the sparkfun bluetooth mate silver. I am trying to start working on control via bluetooth for my Arduino. Only thing is I need to set the baud rate for the bluetooth mate, all guides I can ...
- 119
2
votes
1
answer
3k
views
Pairing to a module containing multiple Bluetooth units
I’m working on a project where a module is suppose to stream an audio signal to multiple receivers via Bluetooth. To be able to connect more than 7 units to this device, I thought of using three ...
- 151
1
vote
1
answer
5k
views
How many Bluetooth modules can work in one room?
I know that Bluetooth has a large band of frequencies but how much interference is there between them? How many of them can i have in a 25m2 small room without them interfering with each other under ...
- 27
1
vote
2
answers
290
views
Why do Bluetooth modules always include the whole protocol stack
I was looking to add Bluetooth connectivity to some embedded design, and I was surprised to see that all modules available have a complete protocol stack included, that (as I see it) seem to limit you ...
- 16.1k
1
vote
1
answer
222
views
Bluetooth Concurrent connection
I have multiple sensors that sends data via bluetooth to my laptop. At present, I can only connect one bluetooth sensor with the bluetooth of my laptop. It needs pairing, and then connects. So if I ...
- 1,638
1
vote
2
answers
12k
views
HC-05 Bluetooth AT+INQ command not working
I have followed the directions from the site below for bluetooth comm between an Arduino board using the HC-05 and an smartphone. It works fine.
The problem is that I need to measure the RSSI from my ...
- 113
1
vote
1
answer
1k
views
Standalone Bluetooth [closed]
I have a bit trouble here. I need to have a bluetooth device (preferably cheap) to be placed on my room. Then I want my buddy phone to pick up and pair with that bluetooth device. I have developed a ...
- 117
1
vote
1
answer
392
views
Microcontroller Bluetooth Multiple Connection Support
What exactly is the bottleneck that might prevent a bluetooth device from being able to pair to more than one peripheral device at a time? Is it the connection, antenna, protocol, etc?
I'm planning ...
- 315
0
votes
1
answer
1k
views
Why does Bluetooth Low Energy use 3 advertising channels?
Why are there three advertising channels (rather than two or four, etc)?
- 125
0
votes
3
answers
217
views
Mosfet motor problems with bluetooth module
I'm playing around with a bluetooth module and want to control a motor using the module and a phone. I manage to control a small motor (±30 mA), but as soon as I'm connecting a bigger motor I'm ...
- 259
0
votes
1
answer
1k
views
Bluegiga BGScript Accelerator sample. I want to understand the example code
I started BGScript few days ago. I have many questions about BGScript. Any help will be appreciated. Thanks!
*My goal is advertising with accelerator data via BluetoothLE. I am going to use ADXL345 ...
- 147
0
votes
1
answer
2k
views
Integrating simple Bluetooth functionality without microcontrollers
I have recently bought a Bluetooth HC-05 Module, and have followed many tutorials on integrating it with an Arduino, or a microcontroller. However I got interested in whether it is possible without ...
- 113