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.

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9 views

BlueNRG-2 from STMicroelectronics Range Problem

I have configured my Bluenrg2 with the help of a Bluenrgsdk module with Data Length Extension of 251 bytes and ATT_MTU as 247. I ...
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45 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 ...
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29 views

Which material enclosure to avoid impeding signal of Bluetooth and wifi?

I’m making an enclosure for: https://www.digikey.in/product-detail/en/ESP32-PICO-KIT/1904-1030-ND I read that Bluetooth signal can be impeded by 37% by a plastic case. If that is so, then how does ...
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Piconet with STM32's BlueNRG 2 Development Kit

I would like to develop a piconet using STM32 BluenRG 2 development kit by setting up one master device and multiple slave devices. Every slave is connected to an analog sensor and the master should ...
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43 views

MAC Address as Serial Number in Embedded Systems

Is it ok to use a MAC Address as a serial number in an SoC with BLE? Are there any security threats to this perhaps? Or drawbacks?
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Is it possible to use two HM-10 on two Arduinos for bidirectional Bluetooth communication?

I am thinking about using the HM-10, or some other bluetooth module on two Arduino boards for Bluetooth communication. What I want is to be able to send and recieve data from a single Arduino board. ...
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37 views

Designing a bluetooth audio unit for speaker

(Cross posting from Sound design stack exchange since it was declared off topic there) I have a sony speaker from an old Home Theatre System that is broken now leaving the standalone speakers in a ...
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49 views

XS-3868 module stops noise for 5 seconds, how to make it longer

I've made a bluetooth audio receiver using XS-3868 module (using this diagram) and connected a TP4056 charger module and a lithium-ion battery too. Everything works fine. When the charger module is ...
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28 views

Pro Mini wireless programming with auto start (reset)

After a long play, I made this adapter to be able to program a Pro Mini wireless via BlueTooth. The long play wasn't the adapter but the settings of the BlueTooth module (baudrate is fixed and need to ...
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bt800 component. Need som help understanding how to send commands

Datasheet << The bluetooth module im using. Im planning on using this bluetooth module on my project. Im 99% sure how to do it but as im designing it for being mounted on a PCB so i want to be ...
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Building a Bluetooth dongle from scratch

I am trying to build a custom wireless mouse and I was initially a bit confused on how "wireless" can be implemented. What I was confused about is how some mice have dongles while others simply pair ...
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Are bluetooth advertise published on one or on at least one channels?

According to the BLE protocol, when a device is advertising, three channels are used to minimize interference and a channel hopping strategy is put in place. Probably due to my poor knowledge of ...
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57 views

What would it take to add Bluetooth capability to a digital (musical) keyboard?

I am completely new to electrical engineering. I have a software background and have an interest in tinkering with hardware. I'm wondering what knowledge/engineering skill/equipment is required to ...
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23 views

Diagnosing USB Power bank shut-off on load application

I'm trying to create a small bluetooth boombox-style speaker, but am having trouble powering the device from a USB battery bank. Fundamental Problem: The power bank "shuts off" as soon as the load is ...
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16 views

How to enter shutdown mode with low power mode enabled on RN4871 BLE module?

I want to use the Microchip RN4871 BLE module for a future project. It implements a low power mode that disables the internal 16MHz oscillator which in turn disables the UART interface for ...
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35 views

feasibility of transmitting uncompressed 16-bit PCM audio through bluetooth

I wonder about the feasibility of this idea, and whether this is something worth doing more research on. I am trying to send 16-bit 16 kHz single channel microphone audio via bluetooth, from one ...
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49 views

Unknown characters in the serial monitor

I am trying to sniff the UART communication line of a commercial BLDC controller. The UART port connects to the Bluetooth module and the Bluetooth module connects to an Android App. I am able to get ...
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46 views

A simple Arduino Uno HC-05 system doesn't work

I have an Arduino Uno, HC-05 module and an LED. I want to connect the HC-05 to my phone and with an app be able to turn on and off the LED and at the same time sending a message from the Arduino to ...
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68 views

What is a proper way to send information from an HC-05 (Bluetooth module) to a phone?

I have 12 simple touch sensors and each of them produces an analog output. I want to send that information to a phone (or some other device). To do that I would need to use the HC-05 Bluetooth module. ...
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25 views

What does “Power Off OOL” AT command mean for a Bluetooth module?

I am reading the datasheet for the OVC3860 Bluetooth module and one of the AT commands is 4.50 Power Off OOL #VX. The description from page 21 of the datasheet is below. [] What does OOL mean in ...
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30 views

Receive power for Bluetooth Audio

Does anyone know the typical receive power for a Bluetooth radio when receiving audio either A2DP or ATX? I want to do some system power analysis to examine the radio power as part of the overall ...
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57 views

Can I use a single wire as the BT Antenna?

I am using the following BT Module and was wondering if I could just use a single wire as the antenna? I have seen wifi devices with a single wire soldered or connected to the board with a short run ...
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72 views

Is it possible to use Bluetooth serial and BLE client simultaneously in ESP32?

Is it possible to use classic Bluetooth and BLE at same time in esp32 with Arduino ? IDE - Arduino ide
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115 views

How do true wireless earbuds perform inter-ear communication?

What protocol, frequency band and messaging style is used by typical popular true wireless earbuds between the two ears? Is it another Bluetooth connection? Bluetooth LE, or something proprietary to ...
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35 views

Sending an arduino program via bluetooth

I have a bluetooth equipped Windows PC. I also have a Bluetooth Bee Standalone (BT integrated with microcontroller). Does anyone know how to send a program from the PC to the Bee and possibly start ...
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49 views

How would I connect an HC-06 bluetooth module to an SN75176A RS-485/422 transceiver?

I am trying to fashion a small module that would allow me to connect to an RS-485 system via Bluetooth. I have found that the potentially cheapest solution would involve an HC-06 TTL Bluetooth ...
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17 views

HC05 + Atmega32

I'm working on a project that receives one byte from Android phone through Bluetooth. And i'm using HC05 module for transmission. But the problem is i'm receiving and sending wrong chars. For now i'm ...
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Bluetooth Controller using Arduino Uno and HC-05 doesn't work when connected to PC

I had an old Guitar Hero guitar that had the circuit board on the inside broken, so I decided to replace it with an Arduino Uno and an HC-05 to make it work over bluetooth. I installed the HID capable ...
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126 views

Identify IC manufacturer by logo

What is name of the IC manufacturer with this logo? Probably it is Chinese manufacturer. I wasn't able to find it here or here. I need to find specification or datasheet of its audio bluetooth ...
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34 views

STM32WB55 and transmission of strings over BLE

I have developed a "Medication Device" which will enable elderly people to take their medicines on time. It will memorize all the information such as Name of Medicine and Time to Take Medicine. The ...
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Are there official roadmaps or release dates for future Bluetooth versions?

I am currently researching about certain Bluetooth versions. 5.0 and 5.1 were released in 2016 and 2019, but I haven't been able to find a official statement of the SIG about the release of planned ...
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Does Bluetooth interfere with WiFi?

I've read that WiFi b/g/n is using 2.3995 to 2.4845 GHz. Bluetooth is in between: 2.4000 to 2.4835 GHz. So what will happen when I put a Bluetooth sending device next to a WiFi sending device? Will ...
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Can I make this Bluetooth speaker stop cutting off its speakers when audio signal goes silent?

I have a simple Bluetooth speaker that always seem to cut off its speaker circuit when the audio stream goes silent. This makes an audible popping noise, which is repeated when the stream starts ...
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41 views

What does changing the volume on a Bluetooth audio device really do?

For example, when playing audio from a smartphone through car speakers, you can change the volume on both the phone and the car. It makes sense that when changing the volume on the audio controls in ...
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Connecting several slave BT modules to a Raspberry pi

I bought a couple of BlueTooth modules DSD TECH SH-M08 CC2541. These modules only work in slave mode. My idea is to stick them to several Blue pills, all already equipped with temperature and ...
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33 views

CubeMX doesn't create bluenrg_utils.c

In case someone already stumbled upon this issue I'd be glad about every advice. So I have an STM32 that is connected to a BlueNRG-MS and I set everything up using the CubeMX. There I select the ...
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42 views

Is it possible to send data while receiving audio with a bluetooth module

BM64 bluetooth module supports the following profiles : A2DP 1.3, AVRCP 1.6, HFP 1.6, HSP 1.2 and SPP 1.2 Using the A2DP I can stream audio output to a speaker as it is for a sink, thus a speaker. I ...
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Prevent click/pop from transient when bluetooth receiver disconnects?

I have a Logitech bluetooth receiver connected to my hifi to allow kids etc to play music from iPhones/ipads. However, it seems that the receiver itself has a sleep mode when no signal is being sent,...
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Bluetooth vs Bluetooth LE susceptibility to interference

Bluetooth Noob here. We are currently developing a device which utilizes BLE for connectivity with mobile phones. However, we are experiencing a large amount of interference and broken connections in ...
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32 views

Can smartphones connect to bluetooth mesh networks as nodes?

In an existing Bluetooth Mesh network where there are a few nodes that communicate with each other. Can an android smartphone connect to that network (where necessary) and be a part of such network as ...
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67 views

CSR8645 3.2 bluetooth module audio output merge negative pins

I want to use this module with my car aux in which is has 3.5mm 3 pole jack. This module has separate negative pins as LN and RN. I need to merge and connect these pins to aux in common negative pin.
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Arduino - Connecting to a remote Bluetooth device asking for a passcode

I have worked on many Arduino projects but this time I am facing some hurdle that is too strong for me. I want to use a Bluetooth module as a MASTER. Purpose: Connecting to a camera and sending ...
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30 views

Sniff Bluetooth from remote control

I need to sniff commands from a remote control (without an android application) to a Bluetooth slave device. I have read many articles, but all of them have to do with android applications that report ...
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725 views

Is it possible to use ESP32, BLE4 or BT 2 and WiFi same time?

I am planning to use ESP32 module to transfer data using wifi (ESP32 web server AP)to remote PC and also the same time I need BLE to communicate with a mobile app and get some data to eps32. so I ...
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How do I get started on my RFID project (beginner)? [closed]

This is related to a recent, off-topic post I had linked here. I'm trying to make this post more for advice on my project, since I'm new to electronics and RFID and not entirely sure what I'm looking ...
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63 views

Getting two way audio from/to a landline telephone, and making it ring

I have a "land line" telephone (ie. with an RJ11 plug) and a CSR8615 HFP bluetooth module (datasheet) — I'm looking to make my mobile's phone calls ring the land line phone, as well as being able to ...
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78 views

Toggle power between modules/devices

I'm absolutely new to this subject and I have no idea how to start, save for the fact that I need an microcontroller for this. I want to toggle the power between modules/devices I want to hook up to ...
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89 views

bluetooth 5 interference from other phones interrupts audio (a2dp and hfp)

(I tried to find the best forum to ask this, here seems the best place; please recommend alternative before downvoting) Problem: while listening to music over bluetooth A2DP profile from a gps (zumo ...
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144 views

50 Ohm impedance RF transmission line PCB design

I am designing a PCB for a Bluetooth 5 device using Qualcomm chip and a Murata BP filter. The RF circuit is composed of: an SMT antenna that has a 50 Ohm unbalanced feed point impedance, a Murata 2....
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40 views

Bluetooth HC-05 AT Commands

I'm attempting to put an HC-05 module into command mode in order to change the PIN and default baud rate etc. According to the datasheet, PIO11 needs to be high to do this, so I connect it to 3.3v, ...

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