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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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1k views

Using BLE, how fast can I get ~50 bytes of data from the master to a slave? How does that change when increasing the number of slaves present?

In personal project of mine I'm looking to have a system where a number peripherals need to have provided to them, in as real-time as possible, small (~50 bytes max) amounts of information from a ...
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2answers
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Can I use TI's cc2541 BLE as micro controller to perform operations/ processing instead of ATmega328P AU to save cost?

I am using arduino pro mini (which contains Atmega328p AU) along with cc2541(HM-10) to process and transfer data over BLE to smartphone. I am wondering if I can use cc2541 itself for processing data ...
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2answers
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How to send (simple) data from GATT client to server?

I have a PCB which is using a TI Bluetooth LE chip (CC2541). I'm hoping to send some simple weather data from the client (e.g., phone) to the server (CC2541) infrequently (once a day/week). Will a ...
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1answer
383 views

Beacon detector using microcontroller and BLE

I am looking for BLE device which can detect ibeacon or beacon module/tag. I am interested to use microcontroller with BLE module instead of smartphone for beacon detector. Can any one suggest where ...
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1answer
608 views

What is the maximum number of simultaneous BLE connections? [closed]

What is the maximum number of BLE peripheral devices that can be in connected state to a central, according to BLE specifications? Also existing hardware implementations seem to have limitations of ...
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0answers
105 views

Low Current Consuption on a Voltage Inverter

I'm working with a uC and a Bluetooth Module. I need the lowest current consumption in this project because it is intended to be a mobile device. Thus, I'm using sleep modes on the uC. Now, I've ...
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0answers
351 views

Bluetooth BLE ILT254s

I want to understand a little how a BLE module works. I have the following module ilt254s(the small version) but until now I was unable to communicate with it. Here is the datasheet. I want to be able ...
2
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1answer
381 views

How to avoid multipath noise

I have a device that broadcasts BLE advertisments, I am trying to measure the RSSI level of the broadcasts on another device (I am trying to do indoor triangulation for location estimation) When I ...
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2answers
3k views

Bluetooth modules: Bluegiga BLE112 and HM10

I see that Bluetooth LE modules like the Bluegiga BLE112 sell for around $20, whilst HM-10 sell for just $4. Beside the FCC certification, what makes the BLE112 a superior product? The both have ...
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1answer
166 views

Collect Bluetooth Low Energy Data

I like to analyze bluetooth low energy advertising packages on an Arduino Uno. This tasks poses me problem because the BLE modules I have found only work in device mode (Adafruit, RedBearLab, and ...
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457 views

BLE connectable but not scannable

Is is possible to connect to a BLE device without thesaid device being discoverable? I don't seem to have to search for a device to be able to connect to it (just knowing it's address), but I don't ...
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2answers
486 views

Maximum Data Rate on BLE Dual Mode Device

Can a Dual Mode BLE device transmit data at the BT (BR or EDR) speeds? I am working on a project that is power sensitive and usually transmits very little data - so BLE makes sense but the device will ...
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2answers
813 views

Using a microcontroller+BLE (Bluetooth Low Energy) +Servo with one battery source

I am currently working on a project where I was looking for a microcontroller that is capable of BLE (Bluetooth Low Energy) which determines a servo's position. Using an Arduino the project works well ...
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1answer
1k views

BT LE Connection Interval?

I captured an in-process asymmetric connectionless Bluetooth LE link from one device to another. It is a steady flow of data from the remote to the central. See the screenshot below, where I've added ...
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1answer
79 views

Avoiding heavy controller boards in a MEMS sensor circuit

I am very new to the circuit designing and the "Internet of things" world. I am trying to put together, for simulation purposes, a system that can pull information from a mems accelerometer sensor and ...
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2answers
21k views

Is BLE 4.1 backwards compatible to BLE 4.0 ? Can a phone with bluetooth 4.0 talk with a mote with BLE4.1?

BLE 4.1 is out and it could be considered the biggest news for internet of thing developers. I want to know if my mote with BLE 4.1 can interact with iPhone 6 which has Bluetooth 4.0.
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1answer
134 views

RFID reader and bluetooth connectivity

Can an RFID reader detect bluetooth device? I downloaded an application called RFID explorer on my phone. The application helps to get read by RFID readers. I switched on the bluetooth on my phone and ...
2
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1answer
433 views

Can Bluetooth beacon be detected while it's in motion?

I'm curious to know if smartphones can actually detect Bluetooth beacon which is in motion, say while driving. Can car A detects the beacon in car B if they pass each other? If yes, what is the speed ...
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1answer
263 views

Could a HM-10 be powered by a LiPo with LDO?

The HM-10 BLE module has a VDD range of 2V-3.7V. A fully charged 18650 could be 4.2V (even 4.4V?). Could a HM-10 be powered straight off a 18650? Are modules typically designed to run directly off a ...
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1answer
182 views

Security for Bluetooth 4.0

I know that bluetooth 4.0 is using layer level AES 128bit for security . There is something ,which basically is not clear to me. We are sending data to some BLE 4....
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1answer
3k views

Can I read ibeacon data using Arduino?

I am using an HM-10 module (BLE) and Arduino UNO. My goal is to read data from ibeacons using Arduino and HM-10 module (BLE). Is it possible? I have not been able to find any articles on this. All ...
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1answer
712 views

Building a bluetooth buzzer

I'm hoping to build a simple bluetooth buzzer using a Serial Port BLE module: HM-10. When a slave connected to it, if the slave sends a certain predefined message, the buzzer sounds for one minute. ...
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1answer
8k views

Does Bluetooth 4 or 802.11b/g/n penetrate through walls better?

I'm thinking of building a signal beacon designed to be used indoors. The transfer speed isn't critical but range and penetrative ability are. Does anyone know if Bluetooth 4 or 802.11b/g/n might be ...
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1answer
874 views

Android ble device issue with rssi and connectivity [closed]

I am working on android ble using nordic. I have few issues: I see rssi strength of device in dBm like -88 dBm, -77dBm which value is good for proper working as it is in negative so bit confusing to ...
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1answer
2k views

How do I get a chinese nRF51822 development kit running examples with an ST-link, Keil uVision?

I've been working at this for days with not much information out there to assist me in fixing my issues, so I figured I'd make a post here. I'm using a cheap chinese nRF51822 module and motherboard ...
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1answer
83 views

Can bluetooth be used in an application of notifying people when their friends are near them, assuming both have bluetooth enabled devices [closed]

I have a project. I want to make people aware that their friends are near them without using any internet. Is bluetooth a better option? Or is there anything better than this?
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1answer
510 views

After research, how should I go about creating a bluetooth peripheral?

My goal is to create a very simple (1 input, 1 output, both high / low states) bluetooth peripheral to be worn on the wrist to connect to an android phone running Lollipop. I have the following ...
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1answer
5k views

HM10 Bluetooth (CC2541) put in to sleep while connected to iOS application

I'm trying to trigger an action on iOS application using HM10 Bluetooth module. And i have successfully accomplished the functionality, But now my concern is the power consumption, I have already ...
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1answer
298 views

What are Peripheral Interface and Host Interface?

For this bluetooth smart module, the specification says UART and USB host interface SPI, I2C, PWM, UART, GPIO peripheral interfaces what is a host interface and ...
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1answer
280 views

Power Consumption and Expected Lifetime for a given design

I have a requirement where I need to sense proximity with Hall Effect Magnetic switch and to send the detection over Bluetooth. There are space constraints for this module and hence coin power cell is ...
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1answer
3k views

Feasability of an Arduino indoor positioning system using BLE

Our project is to guide a blind person in a known environment (here it's an exposition hall), and we need to have a precise way of figuring out where the user is. Our current solution is to use ...
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1answer
11k views

Bluetooth 4.0 vs. Bluetooth LE, is there a difference?

Is there a difference between Bluetooth LE and Bluetooth 4.0? If so what are the differences? If I'm buying devices (such as a TI SensorTag) and not the planning to use Bluetooth 2.x or Classic, ...
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1answer
2k views

Loudest Piezo with low voltage and current?

I am making a board which will communicate wirelessly with a smart phone. When I send a specific command, I want it to sound an alarm to the user, making it able to be found when lost. I've got ...
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2answers
416 views

Choose between Bluetooth Low Energy advertizing and connection for low-power small-data application

I have several sensors running on coin batteries, which are supposed to send data to a central device periodically. The data size is small: the meaningful data should be a few bytes excluding the BLE ...
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2answers
55 views

How could I power flexible oled screens with wearable power source and could I transmit data onto it with bluetooth via app [closed]

How could I power flexible oled screens with solar power and could I transmit data onto it with bluetooth via app? Would this be possible? please can you help thank you
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1answer
911 views

nRF51 DK with Keil uVision. I2C library compilation error

I am working with the nRF DK trying to read a sensor over I2C. I wrote some code in Keil uVision and I finally could read the sensor. However, for some weird reason I can't figure out, recently the ...
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1answer
2k views

2.4GHz Bluetooth PCB Trace Antenna Range

I have designed a PCB trace antenna for a BLE module. I used an existing reference design, which is offered to be used in your own design. I am able to connect to the radio, and on a spectrum analyzer ...
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3answers
777 views

Bluetooth frequency-hopping advantages

i'm learning now the about Bluetooth (and BLE) and feel I need some explanation what the advantages of using frequency-hopping method. Can anyone please explain me in simple words (with examples, ...
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2answers
6k views

What technique can I use to focus a Bluetooth 4 transmission (or at least shield it)?

I'm actually trying to focus an iBeacon that uses Bluetooth 4.0 LE. These transmit in the ISM band from 2.4 to 2.485 GHz. Normally these things radiate in a spherical, or half spherical pattern, but I'...
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0answers
58 views

Is it possible to implement remote controllers with Bluetooth BLE? [closed]

I have been thinking of making bluetooth remote controllers with bluetooth low energy modules that can act as broadcasters and observers (and "peripheral" for set up) How good would that design be (...
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4answers
2k views

Developing BLE device. Questions

I am designing a bluetooth low energy device. It basically reads a sensor over I2C and collect data. You can check data in your phone whenever you want. I have two questions, one related with antennas ...
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1answer
2k views

BLE Transmitter for Production

We would like to add a BLE transmitter to our board so that it can serve as an iBeacon (and whatever the non-Apple equivalent is known as). It seems like the engineers at Estimote and Stick n Find ...
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1answer
320 views

Bluetooth 4.0 - stream mode

I want to use Bluetooth 4.0 protocol for stream communication between MCU(STM32) and Android/iPhone smartphone. Does Bluetooth 4.0 supports any other case scenario than usual(Heart monitoring, fitness ...
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1answer
118 views

Using Solicore flexible batteries as replacement of CR2032

A device that I am using (Gimbal iBeacon series 10) uses 1 CR2032 battery that lasts for 3 months. I am trying to find out if I can replace it with a flexible unit from Solicore. CR2032 spec from ...
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1answer
437 views

Ultra low current pulse generator (for BLE module interrupt)

At the moment I'm working on a project with at BLE-module. This module is based on the CC2541 from TI. I want the BLE-module to permanently transmit a signal. This module has two modes: a level- and ...
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2answers
1k views

What are the UART voltage levels for the RN4020?

I've recently bought an RN4020 BLE module, but I'm having figuring out how to make it work. In the datasheet some pins are listed as 1.65V input, 1.35V out, while ...
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1answer
77 views

Power output needed to go through a car

I need to know the power output needed for transmitter if I want that receiver catch this signal? In details, there is a tunnel 4 by 4 meters and a cars in it, cars have a receiver inside and ...
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1answer
775 views

How to define a GATT profile for a BLE peripheral?

I have just bought a BLE device that can act as peripheral or central (a BLE mini). Out of the box the device is like a wireless UART as a peripheral. I looked at the example chat app under the hood ...
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1answer
96 views

Dropped Bluetooth Connection While Charging through Solar

I am trying to charge a device (not of my own invention) with a solar panel. Sorry for the lack of name, but I’d like to keep my project my project. The panel is rated for 4.8v at 100 mA, and the ...
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1answer
1k views

Undefined part of CSR8645 chip

I am trying to build a bluetooth audio headset and decided to use CSR8645 chip, but while trying to understand diagram of this chip i couldn't identify one part of it. I am uploading picture ...