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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1answer
47 views

Can I use a lithium charger for a bluetooth speaker with a NiMH battery? [closed]

I have a BlueAnt bt blast bluetooth speaker that I need a new charger for. It says DC 12V on the back by the power supply. I checked the manual and this speaker has a NiMH rechargeable battery. Can I ...
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26 views

Can you differentiate between RFID types?

Background: We have a project were we want to be able to assign a scanned RFID to an object in a database. The scanners, using Bluetooth, will vary wildly, but will use either UHF or LF, but at first ...
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25 views

Replacing a Li-Ion battery with a capacitor and power supply in a bluetooth speaker

I have a Philips BT3500 speaker with a dead Lithium Ion battery. I want to be able to use the speaker without the battery - using just the power supply. It used to work for some time with the usb ...
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1answer
109 views

Ultra wide band

I am working with an ultra wide band device (DWM1001 dev board) and I was wondering how does a UWB connection work? How do you connect one device to another through ultra wide band? I know that there ...
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24 views

What Bluetooth Module to use for Bluetooth to USB Gateway

I want to build a small Device that connects to my Bluetooth Keyboard and Mouse and pass through or relay these Signals as Standard Bluetooth devices via USB to 2 connected computers. My Idea was tu ...
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26 views

Is HC-05 Bluetooth adapter suitable for logging fast?

Just bought HC-05 bluetooth adapter from Ching and I wonder how fast HC-05 is if I can do logging with it? Assume that we have a PC and a microcontroller. The PC have a FTDI232 connected to the USB ...
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20 views

Bluetooth Receiver Board - Noise Problem

I recently bought a bluetooth receiver board in order to add bluetooth to my car, this however is not as easy as I thought. I am not very skilled with electronics. I have an aux audio input in my car ...
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1answer
50 views

NRF24L01+ (RF Module) for Smart Home Device Communcation

A while back I purchased these RF modules (NRF24L01+) and I am starting a project using them; the project is implementing a network of smart devices as slaves connected to a central wifi-enabled hub (...
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2answers
104 views

Why is FM modulation not used in modern cellular communication?

Both bluetooth and celular links use GHz level carrier waves. Yet the modulation techniques are very different. I know why FM is more resilient to noise comparing to AM. But why is FM preferred for ...
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25 views

Bluetooth Low Energy IoT device compliance

I´m designing a bluetooth IoT BLE device and have heard that making use of the Bluetooth logo in the device implies an annual fee for Bluetooth SIG. I would like to know if this only applies to the ...
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20 views

Adding an aux cable

recently I added a bluetooth module to my car, but I would solder on this circuit an aux cable This is the circuit that simulates a cd changer. The blue circuit is bluetooth module (qualcomm csr8635) ...
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90 views

Is there a safe or better way of using an AAA battery in place of an AA battery in small electronic devices/ sensors, when in bind like pandemic?

Is there a safe or better way of using an AAA battery in place of an AA battery in small electronic devices/ sensors, when in bind like pandemic? For possible use in small electronic devices without ...
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20 views

Bluetooth Broadcasting (BlueNRG-2)

I have a few questions regarding the use of the BlueNRG-2 device I am building a system where I have to send small data packets (10 bytes) from 1 unit to 10+ units. I am aware that you can only have ...
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1answer
30 views

How to use two antennas with a single Bluetooth module? (BLE repeater)

I am working on a project that uses small Bluetooth low energy (BLE) beacons to track important items. However, we have run into a situation where one location will store these items underground in a ...
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22 views

Troubleshooting adding a bluetooth receiver to my intercom system

I have a Nutone IMA 4406 intercom system with several intercoms throughout the house. I am interested in wiring a Bluetooth receiver to its Auxillary line in connection so that I can stream music ...
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26 views

JAWBONE NERD dongle => Normal dongle [closed]

I have a JAWBONE NERD DONGLE which is specifically connectable to Jawbone Icon. I'm trying to find a way to turn this into a normal dongle. I am not asking you to make the program; just please tell me ...
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20 views

Finding Bluetooth SoC for audio

I'm trying to find a Bluetooth SoC that supports A2DP (at least) and AVRCP. My goal is to connect my phone to this module and have the built-in MCU perform some task when volume commands are received. ...
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39 views

Bluetooth 24 Pin IC Identification - 1942UDZ - GEP5436.69 - win-668 - Logo

I'm trying to identify the 24 pin Bluetooth IC below. Google returns nothing related. Any clues would be much appreciated. Maybe even the manufacturer logo would be a start AA, AV, VV, VA? The chip ...
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1answer
39 views

RN42 Bluetooth module doesn't turn on. Any tips for troubleshooting?

I've made a PCB that uses a RN42 module. Here's the datasheet and a user's guide (albeit for an eval kit, rather than standalone module). The situation: I power up the module with 3.3 V, and the ...
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3answers
35 views

HC-05 Bluetooth RF transmit power [duplicate]

The datasheet of the HC-05 Bluetooth module says the RF transmit power is up to +4 dBm RF, but I think that is for boundary value conditions. I am planning to use the it at a data rate of 100 kbps ...
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25 views

Bluetooth power source RF circuit

I am trying to design an RF circuit/ a PCB that has Bluetooth functions for transmitting data. I am looking at how to integrate this into a power source. I am quite new to this and not too sure how to ...
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11 views

TI Chip Datasheet for CC2541 does not have bluetooth interfacing instructions?

So I'm a bit confused how I might interface with this chip here http://www.ti.com/lit/ds/symlink/cc2541.pdf. It is BLE enabled and I've written a barebones iOS app to connect via bluetooth to the chip....
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14 views

How to analyze Bluetooth Low Energy traffic in Wireshark

I am trying to analyze the traffic captured for a blue Bluetooth Low Energy device in wireshark. I have figured out that data is transferred using the ATT protocol, but I do not see anywhere that ...
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1answer
49 views

Bluetooth and Wifi range onboard a boat

On my sailboat the range of wifi and Bluetooth appears to be very much shorter than in my home - I can't figure out why. ex1: At home I can stream video with Miracast from my basement to a room ...
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51 views

How does a layman interface with a system on a chip?

I'm looking to build an incredibly simple robot that I control via bluetooth. I've identified the CC2540 from TI which will theoretically allow me to do this. It sounds perfect, it's like 5 bucks. ...
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1answer
82 views

ESP32 ws2812fx BLE leds flicker and flash different colors

I am creating a device to use a bluetooth app to control the effects in the ws2812fx library on a esp32 thing from Sparkfun. It works great using the arduino serial monitor to update. But whenever I ...
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1answer
35 views

Questions about designing my own BLE-controlled LED device

This project is meant to get me familiar with designing my own PCB and working with lower-level components. I have experience with BLE using Arduino shields and BeagleBones, but I want to try building ...
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2answers
110 views

Is it safe to have a ground plane under a Bluetooth module for a DC-DC converter?

I am finishing up routing a 4 layer DC-DC converter PCB. My concern right now is whether or not it is safe to have a ground plane directly under a Bluetooth module on my PCB. Since this is a switching ...
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64 views

Is this burn from soldering?

The device is from Bluetooth earphones from which I took out everything like earbud and microphone. I want it to make it a Bluetooth speaker, I have the speaker. I didn't know much about soldering, ...
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1answer
53 views

Does Bluetooth Mesh violate normal Advertising Rules?

According to Silicon Labs AN1137, Bluetooth Mesh employs two kinds of retransmissions: at the network level at each relay Furthermore the document states: The minimum delay between repetitions, ...
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1answer
55 views

Micro QR-code reading solution

I've tried to repair a headset, but I cannot identify the chipset because they used something that looked like QR code but smaller (wikipedia states that it's micro QR) and I have no solution to read ...
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13 views

Interfacing RN52 with SIM800C

I am interfacing an RN52 with SIM800C to make calls to and from the bluetooth device and so i have connected the speaker line of SIM800C to the mic of RN52 and the mic of SIM800C to the speaker of ...
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37 views

Can a diplexer connect two antennas with 2.4GHz signal to one transceiver?

I'm looking at using a single transceiver to handle multiple 2.4GHz signals. Think like 2.4GHz mouse or game controller. A diplexer can easily take two antennae and plug them into one RF signal port ...
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1answer
42 views

Bluetooth power standard values

Let´s say I have a device with a bluetooth (BLE) 5.1 radio and I would like to know when, using a mobile phone, the power received from the device is good enough to stablish a reliable communication ...
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1answer
40 views

7388 based amplifier restarts at high volume

Please find below the quick drawing of my DIY amplifier with MIC input based using the TDA7388. The purpose is for an announcement system so stereo separation is not that important. The problem I am ...
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2answers
102 views

Why does modern bluetooth audio need lossy compression? [closed]

I understand why Bluetooth has issues with latency, but what is unclear to me is why we're still using lossy compression codecs for it. The latest state-of-the-art (at least according to the marketing ...
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42 views

Is it possible to transfer a bluetooth signal via something else?

Problem: For example, I have 2 devices communicating with each other via bluetooth. But there is a thick metal wall between these devices and this makes a difficulty between them. To fix it, can I ...
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1answer
26 views

Driving an Adafruit motor shield and a bluetooth module with Arduino Uno

I am creating a simple 4 wheel robot (BO Motors 200 RPM) with Adafruit Motor Shield and Arduino Uno V3. I am trying to use a Bluetooth module to control the robot. However, unlike Mega, I do not have ...
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9 views

Bluetooth Advertisements with multiple PHYs?

One thing I am confused about on Bluetooth 5. There are several different PHYs available on Bluetooth 5. My question is, can devices listen and/or send advertisements with multiple PHYs? What is ...
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Downsides of Extending a USB Bluetooth Antenna?

I found an interesting video about how to extend the range on a USB Bluetooth antenna by resoldering a new antenna in its place: (https://www.youtube.com/watch?v=cwKWOdOHiWY). I'm planning on using a ...
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77 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 ...
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1answer
54 views

Can a single data stream be recieved by multiple bluetooth devices without interruption?

So i know i can make a "server" and send a data stream to multiple devices one after another. But if the data stream is same for 5 devices can they all recieve it at the same time like standard FM? I ...
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22 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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1answer
55 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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1answer
32 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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36 views

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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2answers
65 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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41 views

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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1answer
44 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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1answer
77 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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