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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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Can I give different delays for different parameters while using BLE

I'm working with the BLE transmission. I have to transmit 4 to 5 parameters at the same time but with different delays. Can I do this?. Is anyone have any idea? Here is my part of code to transmit ...
GnanaBarathi SP's user avatar
2 votes
2 answers
96 views

What is the function of the inductor in this Bluetooth audio module?

I found the circuit below for a Bluetooth sudio module that included a 100 mH inductor in series and then a 10 uF capacitor in parallel to the power input. Image source: Iranian electronics seller ...
adam_Barfi's user avatar
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How can a Bluetooth receiver detect signals from a specific device?

If 2 devices send Bluetooth signals on the same channel (Hence they have the same frequency for '0' and '1'), how does the receiver detect the 'right' '0' and '1'?
Jonathan's user avatar
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I2S Interface between Bluetooth Module and CODEC

I need to interface my CYBT-343026-01 bluetooth module to the AK4619 CODEC via I2S interface. The problem is that CYBT-343026-01 only provides BICK and LRCLK, but it doen't provide MCLK which is also ...
Andrea's user avatar
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1 vote
2 answers
308 views

"JieLi Tech AC6329C4" design

I'm trying to design a basic "very cheap" bluetooth solution, that can connect to my phone and turn on a light emitting diode via a signal. The cheapest BLE IC I could find was this one on ...
Mustansir Godhrawala's user avatar
1 vote
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75 views

BLE interference from DC motors

The problem: I am making a remote control car. The car is being run with a Raspberry Pi Pico W. The power source is a 11.1 V Li-po. The power to the Pico is being stepped down with a 5 V regulator. I ...
thrandale's user avatar
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46 views

BLE Connection Issues with RN4870/RN4871 Bluetooth Module

For a project, I want to connect my Laptop to a dsPIC microcontroller via BLE through a Microchip RN4871 module to read some data from a board. I can discover the chip and connect to it, but the ...
Roysten R.'s user avatar
-1 votes
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A bluetooth receiver that stays on and doesn't make sound when connecting, etc? [closed]

Background: I run public events for which I use an audio mixer to plug in a microphone and a music player. Sometimes the setup is such that I cannot get to the mixer physically during the event, but I ...
Aayla Secura's user avatar
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Audio noise when Bluetooth is connected

I'm making a Bluetooth speaker with a rechargeable Li-po battery. I had some noise coming from the speaker that I suppressed connecting a capacitor at the Bluetooth board's power source. Apparently I'...
basitj's user avatar
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Why does a PB-02 ignore a "AT+NAME=abc123"?

When I connect to a PB-02 via UART(8data bits, no parity, 1 stop bit) it does not execute all AT commands. These work fine: AT\r\n results in ...
RRIDDICC's user avatar
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HM-10 can't communicate with Nuvoton MCU

I use HM-10 module with NuTiny MS51 development board. This board has 8 bit MS51FB9AE microprocessor. First I have tried the Bluetooth module with Arduino to see if it works. It worked in Arduino ...
Bowman's user avatar
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How to check if I destroyed the bluetooth receiver

I have very little experience with electronics but I tried converting my Logitech unifying receiver to USB-C. I followed the steps I found online and got a functioning result. I based my wiring on the ...
Tee Mizzle's user avatar
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1 answer
70 views

Worst case for power consumption of bluetooth module

I wish to figure out the conditions under which this device will be consuming most current - NRF52832 The supply voltage is fixed at 3.3 V and the schematic is exactly the same as the one recommended ...
Yordan Aleksandrov's user avatar
2 votes
1 answer
140 views

HC-05 Bluetooth Module CircuitMaker

I am new to PCB design, and I am designing a circuit with a HC-05 Bluetooth module. I'm using Altium CircuitMaker and there are no symbols or models in there for a HC-05 Bluetooth module. Does anyone ...
Vagabond4761's user avatar
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101 views

Designing support for BT in a car's audio system

We are designing a pre-amplifier outputting I2S and need to stream this to a car's audio system via Bluetooth. We have tried a module from TinySine, but it turned out it can only connect to headphones....
Max Kielland's user avatar
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53 views

Bluetooth transmitter headphone jack soldering points

I am in the process of modding a 7th gen iPod. I have purchased a Bluetooth transmitter/receiver from AliExpress (VALORO 2 IN 1 transmitter) andtaken the PCB out. Noe I am unsure what points to solder ...
ArrakisHackvist's user avatar
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41 views

HC-05 Bluetooth module not turning on with 3.3V voltage regulator with enable control

I am trying use the following circuit for HC-05 power supply on/off control but the HC-05 module is not turning on after the enable signal is set to high. While testing the HC-05 on/off operation, ...
zastereo's user avatar
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32 views

How would one display raw input to TX pin on a HM-10 BLE module as a graph on a web app?

Basically I'm trying to feed in High low signals into the TX pin of a HM-10 BLE module and display it as a graph, similar to how an oscilloscope would, or possibly just have a threshold where it would ...
rhett a's user avatar
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246 views

Problem identifying Bluetooth ICs

Backstory: Last week, I found a Bluetooth speaker that has a radio feature. I tried changing the charging port that was broken (because I wanted to take a look inside) and replacing the battery with ...
Rafie noviano mukmin's user avatar
1 vote
1 answer
50 views

SPI to classic Bluetooth

I have an embedded system with SPI interface. I need to send file of 400-500 KB to a smartphone so I was thinking to use a Bluetooth board with SPI interface (because of file dimension I would like to ...
Corrado's user avatar
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Issues with Nodemcu, LoRa Module (Lora-02), and Bluetooth Module (Hc-05) for SMS Communication

I am currently working on a project that involves using an node mcu, a LoRa module (Lora-02), and a Bluetooth module (HC-05) to enable the transmission of free SMS between two mobile devices when ...
ElectronicGuy's user avatar
1 vote
1 answer
256 views

Split a single power source to act as two independent power sources?

Disclaimer: I'm very new to electronics. I am building a Bluetooth speaker using an ESP32 dev-board and an I2S DAC which outputs to the audio-amp and then the speakers. I am using a 12 V, 3 A adapter ...
logic8's user avatar
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1 vote
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Bluetooth uC SoM w/ antennae array for AoA direction finding? (or antenna array daughter card?)

I need Bluetooth AoA on custom PCB I'm designing to have manufactured & populated at a pcb shop. Using nrf53 because its well documented, Nordic's support seems good, and I've used the toolchain ...
some bits flipped's user avatar
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1 answer
262 views

Is a matching receiver module needed in order to use a Bluetooth audio transmitter/transceiver/emitter module?

I'm using this audio Bluetooth emitter. I connected it like so, the LED flashes, but no Bluetooth device is displayed on my phone or PC. How do I troubleshoot this or do I need a matching receiver ...
adamaero's user avatar
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1 answer
311 views

Indentifying a JL chip marked 'EE4222-1BB'

I'm new to electronics and my Bluetooth speaker broke and I want to fix it. This is the chip I think I need to replace. Can you help me identify this IC marked 'EE4222-1BB'?
Hung Nguyen's user avatar
0 votes
2 answers
1k views

Can an ESP32 be fed an audio signal and then output that audio to a Bluetooth speaker?

I have a CODEC circuit with a AUX audio output. Is it possible to connect that output back to the ESP32 and transmit to a Bluetooth speaker using the ESP32-A2DP library? If so, would this be the ...
adamaero's user avatar
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134 views

Audio mixer, one output to multiple inputs

I'm trying to create a device that will take one stereo input and send it to 4 or more audio Bluetooth transmitters. This way, I can connect my prjoector to it and everyone watching can listen in on ...
user8833400's user avatar
0 votes
1 answer
98 views

Bluetooth trilateration using nRF5340

I am a total beginner in working with RTOS and Zephyr and nRF devices. I would like to build a Wireless Sensor Network which consists of 3 nodes (maybe set in a Bluetooth Mesh) whose primary objective ...
Andreiul's user avatar
0 votes
1 answer
561 views

How to connect two ESP32 via built-in Bluetooth?

I want to connect two ESP32 dev boards via their built-in Bluetooth to share data between them. (e.g. a remote control car and a controller) I used to connect two HC-05 Bluetooth modules with the help ...
Yiming Designer's user avatar
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1 answer
37 views

How to make HC-05 connect to all users with Android application without pairing?

I want to use the HC-05 Bluetooth module together with the Arduino Nano for an access control system. I want users with the Android application to click a button to open the boom gate. I have made the ...
Brandon Pillay 's user avatar
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1 answer
34 views

Can I draw power from one cell while charging 5 in series?

I recently watched this video by DIY Perks and I want to build some bluetooth speakers using the electronics from a pair of Bluetooth earbuds and a class AB amp for some 10w speakers. Very similar to ...
Adam Hey's user avatar
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0 answers
408 views

ESP32 BLE Bluetooth Serial to Hardware Serial Bridge

I'm looking for a way to use serial devices with my iOS iPhone without buying a $20 device. I have an ESP32 which can do Bluetooth Serial to Serial using this code but if I replace the Serial with <...
UnknownDagger's user avatar
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1 answer
86 views

What is the protocol that is being used in this Bluetooth dual SIM adapter that transfers voice and SMS? [closed]

I saw this product randomly on YouTube, and I'm really curious about the protocol it uses to communicate with the phone and how the phone can detect SIM cards. It uses Bluetooth for communication. For ...
T R Y's user avatar
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1 vote
0 answers
34 views

RN52 Custom Circuit Board Generating a Loud Buzz While Playing Audio

I'm in the process of creating a custom circuit board using an RN52 with a PIC16 controller to hack into my car's stereo and pretend to be a CD changer. The device does work, but while the audio plays ...
aNigerianPrince's user avatar
0 votes
1 answer
522 views

Bluetooth speaker - power supply

I have some 10 W, 8 Ω speakers. I'm building a Bluetooth speaker set. I've hooked up a 3.7 V, 8000 mAh portable charger battery to an XL6009 buck converter to pump it to 9 V. I have a Bluetooth audio ...
Hayden's user avatar
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1 answer
151 views

What to set on Android/Windows laptop if I want to make them as slave?

I would like to control my Android smartphone/tablet or my Windows laptop using another Android/laptop or Arduino with HC-05 module. I want to control, such as, their volume, camera, microphone, and ...
AirCraft Lover's user avatar
1 vote
1 answer
126 views

Is it necessary to add an external filter when using a Bluetooth IC that has an internal RF pin transformer?

Reading the STM32WB15CC datasheet, 3.6.1 states that: Thanks to an internal transformer at RF pins, the circuit directly interfaces the antenna (single ended connection, impedance close to 50 Ω). The ...
Nick Bolton's user avatar
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1 vote
2 answers
63 views

Noise in Audio Circuit Using BT Module

I recently built a simple audio circuit which includes an mp3 BT module. However, I discovered that it produced quite a disturbing noise (I don't have an oscilloscope, but from the sound it produced, ...
Riiko's user avatar
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3 votes
0 answers
162 views

How does bluetooth host know which HID to use and how does UUID work?

I have spent hours reading up on bluetooth (classic, not BLE) and i still have some questions i found conflicting answers on the internet. What is the UUID in bluetooth? is the UUID a unique ID for ...
GnomeMage's user avatar
0 votes
2 answers
71 views

Is the voltage / power running through an exposed Bluetooth keyboard enough to be hazardous?

Unusual question and potentially not the right forum for it. Apologies in advance. In short, I have cracked the shell off a Bluetooth keyboard and modified it (read: Jerry rigged it) to be as light as ...
Pythonista's user avatar
1 vote
0 answers
193 views

HC-06 module does not receive data from Raspberry Pi Pico

So I have a project that I'm currently working on and I am also using the HC-06 module as a part of the communication process between the Raspberry Pi Pico and my application. A while ago when I was ...
David's user avatar
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2 votes
1 answer
701 views

Why is it that for most Bluetooth audio devices, you can't use them while charging? [closed]

Over the past several years, I've had many small Bluetooth devices. I'm not one to buy many of these and, some how, over the years I've been gifted decent "SWAG", portable speakers and they'...
RLH's user avatar
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1 answer
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Debounce switches on car stereo bluetooth receiver

I have retrofitted a Bluetooth receiver to an old car stereo, replacing the cassette. Although this generally works fine, there has been some issues with the three play-pause/ff/rw momentary switches ...
Jungle Jim's user avatar
0 votes
1 answer
316 views

How to enter RN4678 module in command mode?

How to enter RN4678 module in command mode? Does anyone know about connecting the module and the procedure for entering command mode? Connection: P2_0 LOW P2_4 HIGH EAN LOW SW_BTN HIGH P3_3 ...
yogesh shekade's user avatar
0 votes
1 answer
103 views

Arduino Nano - LED - MPR121 - HC_06BT PCB check

I´m working on a multi-touch Bluetooth device with integrated LEDs for a multimedia-installation. Because I'm new in PCB design and electronics in general, I would like to know if this schematic/PCB ...
DiogoM.'s user avatar
0 votes
2 answers
547 views

Trying to understand description of aptX Lossless audio streaming codec bitrate

I was looking at this article about the aptX Lossless audio codec. The article claims that this iteration of the aptX codec can stream CD quality audio losslessly. At the beginning of the article, it ...
user13267's user avatar
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0 answers
200 views

Simulate button click on a Bluetooth receiver with an ESP32

I bought a Bluetooth audio module that I want to control from my ESP32. To control it you change the resistor value of the KEY input to ground. My first thought was to add a transistor with the ...
Simon Watti's user avatar
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1 answer
155 views

Send image using RPI to phone using Bluetooth [closed]

I'm looking to send an image file from a RPI Zero (or RPI4) to a mobile phone. The image file will be sent after pressing a push-button. The connection between the RPI and the phone is only Bluetooth (...
Gal Magen's user avatar
0 votes
1 answer
112 views

BLE Sleep and Rx Mode

A Generic Tx Node: Cycle time - 5s. Tx Time (wake up, Tx, Sleep back) - 0.1ms -> current consumption 30mA. Actual Sleep Time (some sleep mode)- 4.9ms -> current consumption 20uA. However for a ...
ankit sultania's user avatar
0 votes
1 answer
439 views

Fix the volume on a Bluetooth speaker

I recently got a cheap Bluetooth speaker. It works fine, but the indicator melodies (the beeps it makes when it turns on and off) are positively deafening. I'm slowly learning about electronics, so my ...
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