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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31 views

RF Power Measurement with Pig Tail Cable

I submit sample for FCC certification, radio is 30 dBm power at 2.4 GHz. Lab commanded to output 30 dBm with 100% duty cycle but measure only 27 dBm. See attached pics how they have measured the power,...
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29 views

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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18 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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35 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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54 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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1answer
63 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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51 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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71 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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26 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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28 views

Zero range improvement Bluetooth 4.2 -> 5.0?

I have long had the somewhat dubious goal of covering my entire house (or even property) with Bluetooth audio from my desktop machine. I live in a 1300sqft house on a 5000sqft lot. My setup for the ...
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82 views

How to measure RSSI of bluetooth devices on PC

I'm a student in highschool doing research for a science project. I want to measure the RSSI of bluetooth devices on my Windows PC. I've searched on the internet for around 3 days but found no success....
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34 views

Getting RSSI of HC05

I want to get the RSSI value from an HC05 Bluetooth module. Can anyone tell me all the steps to be followed? In my case at the command AT+INQ no response is being shown.
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82 views

Switch between USB and Bluetooth module TTL

In my project I have an MCU that I want to communicate with via 5V TTL serial. I have two methods of doing this in my circuit, USB via an FT232R (5V) and Bluetooth via an HC-05 module and level ...
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55 views

What does a wireless chip do?

This is a basic question but it taken my time for a while since I do not have enough knowledge in this area. Recently, I am investigating about functionality of a wifi and bluetooth chip ...
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73 views

P-Channel MOSFET Flipped on Schematic

I'm designing a circuit which has a bluefruit nrf52832 micro controller built into it. When referencing the schematic provided by Adafruit I noticed that they had +VBAT going to the drain of the p-...
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87 views

Identify these components for bluetooth speaker [closed]

I am wanting to make my own DIY bluetooth speaker (first time electronics project) and I have found several good Youtube videos on the topic. However when it comes to finding the actual parts, I am ...
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62 views

Connecting multiple HC-06 bluetooth modules to multiple smartphones at the same time

So I'm having a "robotics" workshop for kids and we are going to control 6 robots with bluetooth modules. They run on Arduino. I tested the code before class and it worked as expected. I also changed ...
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31 views

Pairing vs Master-slave between BT Module to BT Module

If I take two identical BT modules, for example HC05 or HC06 then is it possible to pair the two modules with each other or is it like you need 1 master and 1 slave module for pairing? Edit: Now I ...
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63 views

Bluetooth speaker works only when aux is plugged in [closed]

Plot Recently got this Bluetooth/FM speaker with a built-in microphone from my friend to try repairing it. He said that it's battery was swollen up so he dumped the battery and never used the speaker ...
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1answer
71 views

Bluetooth vs BT Beacon [closed]

While trying to understand how BT devices work I came across another related term "BT Beacon". Is it same as BT communication or if a device is termed as BT beacon then it would have some specific ...
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45 views

Data transmission from bluetooth module to fpga

I am using an android app which is taking a string and converting it to its ascii values and sending it to bluetooth module hc-05. Now i need to send this data to an UART receiver in an fpga. In what ...
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190 views

Using ESP32 as a2dp sink and access point at the same time

I am trying to make a project where bluetooth and wifi collaborate with each other. Precisely I want to use the a2dp profile to stream the music to one esp, from there via UDP sockets to N esp's. I ...
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72 views

How can I estimate the minimum baudrate for a given bitrate?

My circuit performs data acquisition at 250 samples/s, 24 bits/sample and transmit this information to the local host (PC) through a bluetooth module that implements the UART protocol. As far as I ...
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1answer
19 views

Bluetooth Application File-Sharing [closed]

Is it a practical application to use Bluetooth for file sharing? And is Bluetooth Mesh optimized for this application?
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23 views

Bluetooth Mesh and Bluetooth Broadcasting

I have been reading up about Bluetooth recently and I just want to know if it is correct to say that all Bluetooth 5.0 have the broadcasting feature? Is that the broadcasting feature also found in ...
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37 views

How to convert device that uses OTG to communicate with Android device to Bluetooth?

We currently have a piece of hardware that uses an OTG cable to communicate with an Android application. We are currently using USB Host to communicate with the Android device, but we hope to offer a ...
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2answers
91 views

How to choose the correct ARM chip and understanding the pins at a more intuitive level?

I'm just starting out my journey developing my own board and need some advice how to get started and understand a few things in better context. I will ask my first question first and provide the ...
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37 views

Can I set one relative axis and one absolute axis in a mouse HID descriptor?

I'm building a custom Bluetooth mouse using an ESP32 with a proximity sensor for the Y coordinates and a gyroscope for the X coordinates and was wondering if setting the X axis as relative and Y axis ...
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1answer
30 views

HC05 Bluetooth Ping without losing connection

I am currently working with the Bluetooth module HC05 using a Teensy 3.2 board. I successfully established a connection between the laptop and the board using Bluetooth. I can send data from the board ...
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1answer
163 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 ...
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2answers
106 views

RF communication vs Bluetooth [closed]

I'm starting a new project in my Electrical Engineering degree at my university and I need help. Overall, my project is about a mini robot that collects data and sends it (via wireless communication) ...
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24 views

Bluetooth sensor on sports field - multiple antennas

I am creating a tracking project for lacrosse sticks that uses an IMU to give the absolute position of the stick. The goal is to use it to guess the speed of the ball shot, and I will use that as a ...
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15 views

Frequency of HID reports using RN-42

I'm currently trying to connect a PS1 controller to my laptop through Bluetooth. My current setup is an Arduino Uno interfacing with the PS1 controller, which I managed to do using this guide. After ...
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161 views

How does specific apps find “hidden” Bluetooth devices?

Segway has made an electric scooter. It has Bluetooth so I can connect my phone to it. When I open the app, it asks me if I want to scan for devices. I hit yes and my scooter comes up. I can then see ...
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39 views

Wifi versus Zigbee versus Bluetooth for real-time data sampling

I am working on a project that I would like to send and receive data between a microcontroller (ESP32) and a PC. The microcontroller supports both Wifi and Bluetooth. If I send one single data point (...
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81 views

Vertical distance from PCB antenna layer to ground plane?

I know the basic design requirements for pcb trace antenna, no ground place below or above the traces, impedance matching etc. But the design layout recommendations for pcb antenna doesn't seems to ...
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55 views

Diy Bluetooth speaker antenna

I am building a Bluetooth speaker with a 50watt Bluetooth amplifier board which has a pcb antenna,I would like to get around 150to 200 feet range line of sight, what type of antenna would be best for ...
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1answer
222 views

How to remove noise from microphone input?

The Issue I've made a project centred around the XS3868 module which is based on OVC3860. The circuit works fine and I was able to get the microphone to work except for just one thing, the mic input ...
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36 views

Bluetooth RSSI to Distance [duplicate]

I'm trying to find the distance between two bluetooth beacons which are typically in the distance of 60cm or less. Direction is not an issue, I'm only looking to figure out the distance between the ...
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57 views

Static noise on a TDA7492 Bluetooth sound amplifier board?

I have a KKmoon TDA7492 bluetooth sound amplifier board with an AUX interface (https://www.amazon.co.uk/gp/product/B075QZ19VJ/ref=ask_ql_qh_dp_hza). The issue I have is that whenever I connect ...
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101 views

What makes Bluetooth v5.0 completely better than v4.2?

I read documents about Bluetooth 5.0 and one of my first sign is, v5 has longer range, higher speed and also consuming lower power than v4.2 . Actually these features should affect each other by ...
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34 views

How to link 3 RF transceivers to 1 antenna

I'm not an RF designer, so excuse the newbie question: How would I link three transceivers, say WiFi and two separate bluetooth transceivers, to a single antenna. I have found a 3-way combiner ...
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1answer
198 views

HM-10 Bluetooth: How to read characteristic data via serial commands

I'm programming an Arduino to use an HM-10 BLE device in Central mode to read a BLE Peripheral. I'm able to discover and establish a connection with the Peripheral (via AT+CONnnnnnnnnnnnn command) ...
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85 views

How to connect a MEMS Microphone Breakout - INMP401 to a RN-52 bluetooth module?

I intended to use a INMP401 (MEMS MIC) to capture audio and stream it via bluetooth using an RN-52 bluetooth module (RN-52). The RN-52 has inputs for differential +- signals. The INMP outputs ...
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48 views

RN4871 auto pairing

We are developing an application which needs the BLE Peripheral to be automatically paired with the smartphone when the smartphone is near the BLE Peripheral. We are using RN4871 Microchip BLE Board. ...
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1answer
57 views

Using a Bluetooth receiver with 3.5mm jack headset [closed]

For the past 1/2 year I have been using a cordless Bluetooth headset (this one) connected with my motorcycle Garmin GPS device. While connected the device will not allow me to control the volume over ...
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53 views

Wiring a bluetooth module into car radio, issue with switching between radio and bluetooth [closed]

I have an old Blaupunkt Radio in my 91 VW golf. I have purchased a Bluetooth module from eBay and I have wired the line out from this into the Left and Right inputs to the amplifier that would ...
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57 views

Can I programming Bluetooth module internal registers through UART?

I have a customized Amicomm A8107 Bluetooth System-in-package (SiP) module for a project in a PCB with a STM32F103Z micro-controller. I have 5 connections between my microcontroller and the BT module: ...
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43 views

Did anyone managed to use 48kHz sample rate on chinese CSR64215 modules?

I have several chinese CSR64215 modules (BTM625) and it seems no one of them is able to work on 48kHz sample rate. Did anyone managed to use 48kHz on these modules? I tried to use different sound ...