Questions tagged [bluetooth-low-energy]

Bluetooth Low Energy ("BLE") is a new radio standard, introduced in 2006. Bluetooth Low Energy is a subset of Bluetooth v4.0.

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36 views

BLE beacons advertising frequencies collision

I'm designing a smartphone app that gets advertising transmissions from N BLE beacons that transmit to M meters (approximately), for kind-of indoor-navigation. My goal is to maximize N and M as ...
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39 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
88 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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20 views

WriteCharacteristics doesn't work through ESP but is working through noble

I am trying to work on a BLE lock which is currently being operated through a mobile app using the react-native ble plx. I was trying to make it work through the ESP32 so that it can be controlled ...
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1answer
39 views

RF shield needed for BLE SoC in PCB design

I´m checking the implications of using BLE in a new design. This design will include in the same PCB a BLE SoC, the specific matching network and an anetnna (still checking if I´m going to use a ...
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1answer
24 views

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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63 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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60 views

How do I wire up this item (BM70 - Microchip BTLE) for prototyping

I've just received my BM70 (Microchip BLUETOOTH 5.0 BLE MODULE) via DigiKey and I'm wondering how I can wire it up. According the BM70 Datasheet the pad holes are (are .7mm (outer) and .5mm (inner)). ...
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How to find BEAN_SCRATCH_UUID, BEAN_SERVICE_UUID and BEAN_NAME of an HM10 BLE module?

anybody know how to find the following specifications of HM10 module that i mentioned in the question using AT Commands or any other way?
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3answers
121 views

RF Jumper at 2440MHZ

I need a series component to isolate a 2440MHZ antenna for testing purposes-- it can either be a a high quality 0402 RF capacitor (Johansen) or a zero ohm resistor. The series component will remain ...
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1answer
172 views

Need help in designing custom ESP32 PCB

I am designing a custom PCB with ESP32 PICO MCU. I am going to use BLE peripheral mostly in my application. I have some questions regarding Which type of Antenna should I choose for my application? ...
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107 views

Bluetooth module PCB layout

On my PCB, I have the Bluetooth module (ANNA-B112) on the top layer. Due to space constraints, I had to put some components on the Bottom layer of the PCB beneath the Bluetooth module. The main ...
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1answer
60 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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1answer
318 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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1answer
143 views

Multiple independent antennas on same PCB

Is it feasible to use multiple (e.g. 2) independently transmitting antennas on the same PCB (e.g. 5cm x 5cm) operating in the same band (e.g. 2.4GHz), though on different "frequency channels"? I'm ...
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How to connect GPS tracker (FMB920) to HC05 bluetooth?

I am successfully able to connect my phone to GPS tracker over bluetooth and send commands but was unable to to connect HC05 module to it and communicate over serial. Please help me out of this!
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73 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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57 views

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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1answer
46 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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1answer
3k 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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0answers
45 views

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

Connecting BLE module to Lipo battery and recharge it?

I would like to use a BLE module, where I can solder a tactile switch. There should be also the option to charge the module via USB. Earlier I have only worked with breakout boards, where I could ...
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20 views

Regenerate IRK for NXP QN9020 Bluetooth Low Energy Peripheral

According to Bridging the GAP: Bluetooth LE Security Part 3, IRK Re-generation Each time you clear your peripheral’s bonds, and open it up to a new pairing, you should re-generate your IRK. Why? iOS ...
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211 views

What are the Bluetooth (low energy) scan settings of smartphones

My challenge: I'm trying to find out the best timings for a complex bluetooth low energy (BLE) system, where a central station shall be able to connect to smartphones (=scanner) as well as to coin-...
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1answer
240 views

I2S to PDM Conversion

We are looking to use the TLV320AIC3111 audio codec to process some sound data that we are receiving from MP34DT05-A microphone. We then look to transmit the data wirelessly over BLE using the BlueNRG-...
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1answer
68 views

What pins on a nRF51822 do I connect to a STM32 programmer?

I want to be able to program a nRF51822 with this programmer but I'm not sure what pins on the actual chip I should use, and all the guides seemed to be using a different chip
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1answer
231 views

What is the definition of Bluetooth peripheral device?

What is the basic definition of a bluetooth peripheral device, bluetooth master device and a bluetooth slave device, and what are the functions of each of them? How to define them in a BLE system? ...
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1answer
68 views

MSP432+BLE+ Debugger interfacing

I would like to Interface a BLE to a MSP432 microcontroller in serial. The BLE has a inbulit Atmel controller. I have a firmware for BLE in keil. Intially I have flashed the firmware to BLE directly ...
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1answer
515 views

What's the BLE Range?

I am googling too much stuff regarding it and the noise on there has got me completely confused and there is no a single fixed range I should be checking my system with. ( I am software engineer and ...
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1answer
82 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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1answer
105 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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2answers
64 views

RF Design - Antenna Feed-line Parameters

I am implementing a BLE device with a chip antenna. The device has already been impedance matched to 50Ω and is ready to be connected to the feedline and antenna. The antenna datasheet has a ...
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1answer
23 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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1answer
40 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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0answers
127 views

Lithium battery performance in cold temperatures powering BLE Beacon

I am working on a project that requires the use of BLE Beacons in very low-temperature environments, on average -15°C but on occasion as low as -25°C. We are currently trialling a brand of BLE Beacon ...
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1answer
881 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
2k views

OTA Programming of STM32

I am currently using ST32L152RE controller interfaced with BLE CC2640R2F module and 4 MB external flash memory interfaced through spi. I was trying to upgrade the firmware of my st controller using ...
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2answers
1k views

STM32WB55 Nucleo bluetooth stack firmware binary in bootloader mode

I want to upgrade the firmware for the bluetooth stack on the STM32WB. It requires the device to be in boot loader mode and power from the user USB not ST-LINK usb. However I've not programmed a ...
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213 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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1answer
110 views

SPBTLE-1S - ADC Scan?

I'm trying to use the SPBTLE-1S with 2 analog inputs and read the chip temperature setting, but it seems that if I try to change the mux, it results in garbled readings (eg, temperature reads -120C or ...
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34 views

Decrease the datarate on BLE module for more range

I'm using a HM-10 BLE module with an Arduino for my project and I really need more range. I have read that on the new Bluetooth 5 spec you can decrease the datarate to get more range, is this possible ...
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1answer
146 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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4answers
240 views

How to measure micro watts (uW) [duplicate]

In an extreme low power project (MCU+BLE SIP running on a CR2016 battery for year(s)) I would like to measure the power consumption under different environments/algorithms. What would be the correct ...
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1answer
40 views

Problem with Bluetooth read range for arduino project

I have been working on an Arduino project for a door entry system in my business office but have encountered a problem. I have a group of 8 working in my office but we have a room which only 3 ...
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1answer
396 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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31 views

BLE VCO Function Divide by 2

Can someone explain or point to some documentation that explains how the RF front-end works for BLE chips? Specifically, I am confused about why the VCO runs at 4.8Ghz and is then divided by 2. I have ...
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1answer
414 views

Concurrent central and peripheral mode with BLE

I'm having an ARM M3 which I would like to connect on one hand to a smart phone for data visualization and to two sensors for data acquisition on the other hand. Both connections should be BLE. My ...
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1answer
2k views

When I write data to a BLE Characteristic (FFE1) to send data over bluetooth, is the data encrypted?

I have a very simple circuit which includes a HM-10 that exposes a CC2541 Bluetooth device. simulate this circuit – Schematic created using CircuitLab It's basically just hooked up to power ...
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2answers
283 views

BLE mesh Provisioning

I am new to BLE mesh. I have a doubt that in BLE mesh as per Bluetooth SIG mesh 1.0 spec , if there are hundred unprovisioned nodes, should these nodes be within direct radio contact of the ...

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