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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MC60E- Maximum number of devices that the client can connect to [closed]
I am trying to work with MC60E Bluetooth Low Energy (BLE) feature. I configured it as a client and then connected it to a BLE sensor which is in server mode. I also can communicate with the sensor and ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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'?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 <...
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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 ...
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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 ...
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Bluetooth Speaker - Power Supply
I have some 10w 8ohm speakers. I'm building a bluetooth speaker set. I've hooked up a 3.7 volt 8,000mah portable charger battery to a XL6009 buck converter ( https://www.amazon.com/dp/B07NTXSJHB?psc=1&...
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What would be the best (simplest?) practice for redirecting power and data lines based on the presence of a host usb connection or it's absence?
Basically I'm trying to use a Handheld Scientific BT-500 bluetooth keyboard adapter to make an existing keyboard wireless. The way the module works is if power is supplied (but no data) it activates ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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HC-06 module does not receive data RP Pico
So I have a project that I currenty working on and I am also using the HC-06 module as a part of the communication proccess between the ...
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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'...
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HM-10 (master mode) how to write in a slave descriptor?
I'm using a HM-10 (Version 608) in master mode with a slave (Micro:Bit board).
Bluetooth GATT is working with SERVICE -> CHARACTERISTIC -> DESCRIPTOR
It's possible to write in a slave ...
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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 ...
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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 ...
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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 ...
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Bluetooth low latency (AptX LL) - Multiple transmitters and one receiver with selector
I'd need to implement the following wireless connection using bluetooth AptX LL (low latency):
Multiple transmitters, and one receiver with selector to select the transmitter.
I want to upload the ...
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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 ...
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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 ...
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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 (...
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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 ...
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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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Taking a BLE product to market utilizing a pre-certified Bluetooth module
I've designed a product that utilizes a Raytac MDBT50Q-P1MV2 'pre-certified' MCU+Bluetooth module (based on Nordic nRF52840) and am now considering what it would take for me to legally sell such a ...
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What is the power consumption of 200ms of Bluetooth Beacon advertising/broadcasting
I'm running an ESP32 on 3 AA batteries.
It wakes up up to 1000 times a day, then sends a Beacon advertisting for 200 milliseconds, and then goes to deep sleep, until ...
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Ways to detect close proximity ( ~15cm) of several individual child objects to a mother object [closed]
I'm working on a design project for a university course exam where several small child objects have to detect whether they are in close proximity (~15cm) to a central mother object and switch their ...
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Why are there no WiFi earbuds?
Because Bluetooth earbuds struggle in my home, due to its layout and electronic noise, I hoped to switch to WiFi technology, which has a good signal throughout the house. Either to connect earbuds and ...
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Is it possible to connect two Bluetooth peripherals to the same master?
I would like to design a pair of identical Bluetooth devices (using the Silicon Labs EFR32BG22 Bluetooth microcontroller) which receive a data stream from a smartphone.
As I understand it, a Bluetooth ...
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Hc05 Bluetooth Auto reset to default values
I am using HC-05 with a Gps module to make a Bluetooth GPS.
and i am using 5v mobile charger from the power supply.
also using a B0505S-1WR3 Mornsun 5V to 5V DC-DC Converter for further power ...
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Question about how a Bluetooth signal propagates out of the antenna of a BBC Microbit?
I want to know how a Bluetooth signal propagates to which designated direction in these two pictures with the strongest output from the trace antenna.
Is there any HFSS analysis image similar to this ...
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Feedback on PCB antenna design
PCB antenna: 1 & 2 are solder pads for selecting PCB or external antenna. 3 is the UFL connector. What do you think about my design?
This antenna is for Wifi & Bluetooth on a custom board, ...
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Bluetooth EDR Connection; Loss of Signal; What Spec or Stack parameter determines the time to broken connection
Assume we have two Bluetooth devices talking to each other as continuously as possible. Assume we are using SPP serial port profile. We interrupt the RF signal between these two devices perfectly. ...
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Bluetooth IC performance improves after resoldering/heating
This is a very general question and I'm trying to brainstorm and get some insight into potential issues, things to watch out for etc. Unfortunately, I can't share the schematic or the datasheet.
My ...
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Bluetooth speaker ground wire connected to 4N25
I am wondering if I can use a 4N25 optocoupler to turn on/off two small speakers. The reason for doing this is that when I turn on the unit, I won't have to hear "device connected". Side ...
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Accessing, processing and transmitting data from a simple digital device (a measuring wheel) to Android phone
Firstly, I have no electronic experience, so I don't know if the below is practical, or what hardware and software would be required to make it happen.
Basically I would like to transmit the value ...
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How to switch between speakers automatically based on your location to them?
I'm developing a project that will use a microcontroller to play music from three different speakers. The idea is to automatically switch which speaker is playing music based on which one I'm closest ...
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Digital radio to Bluetooth bridge
I'm studying the possibility of building a bridge from DAB+ (digital radio) towards Bluetooth. The reason is that all the good quality DAB+ tuners are really expensive and the cheap ones usually have ...
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