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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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10
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3answers
20k views

Streaming video using BLE or classic Bluetooth 4.0?

BLE only has a data payload of 100Kbps so I was wondering if it is possible to stream a live video using Bluetooth Low Energy? Classic Bluetooth 4.0 has a data payload of 2Mbps which makes it easier ...
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5answers
1k views

What Bluetooth 4.0 devices and radios are available? [closed]

Bluetooth 4.0 is the latest specification to be adopted by the Bluetooth cabal, which notably adds Bluetooth low energy into the mix, which is designed to allow radios that sip battery like 802.15.4 ("...
7
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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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5answers
19k views

How to get started with Bluetooth 4.0 (BLE / Low Energy)

I want to get started with Bluetooth 4.0 / Bluetooth Low Energy / BLE. I know it's different from a normal Bluetooth. Currently I'm using BlueSmirf Bluetooth 2.1 module, UART interface and SPP ...
6
votes
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 ...
6
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3answers
14k views

BLE Scan interval and window

With Bluetooth Low Energy, you specify a scan window (how long to scan) and interval (how long to wait between scans). Would there be any difference between scanning for 10 ms every 100 ms, or ...
6
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1answer
2k views

Beacons versus Sensor Nodes

What is the difference between a beacon node and a wireless sensor node? In addition to positioning information, beacons can provide temperature measurements. In that case what would be the difference ...
6
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2answers
389 views

Can I run custom firmware on a pre-certified RF module without needing to redo full FCC certification?

I need BLE connectivity in a product, so to save costs on FCC certification, Bluetooth SIG membership, etc. it will use a pre-certified module for this purpose. Usually such modules work in one or ...
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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 ...
5
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1answer
9k views

Bluetooth dual mode (BR/EDR + LE)

I was wondering how does some Bluetooth radio chipsets achieve the dual mode (BR/EDR + LE) ? How do they manage to distinguish between two frames of different modes? Any help or document explaning ...
5
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1answer
112 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 ...
5
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3answers
1k views

Reduce BT power consumption by dis- and reconnecting

This is a question which comes from a programmers perspective (so might be SO, please migrate then) but with an EE background. I am trying to programmatically reduce the bluetooth power consumption ...
5
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3answers
6k views

Bluetooth Low Energy general questions

I'm facing some problems understanding how Bluetooth LE works. First: How is a connection established? Peripheral (e.g. sensor) sends advertisements Central (e.g. tablet) has to scan actively (...
5
votes
1answer
153 views

Primary battery dies after 5 months instead of 25

We have designed a PCB with ultra low power Bluetooth module with the objective to run it on batteries for about 2 years. We have measured the power consumption, it is 400uA on average with 20ms peaks ...
5
votes
1answer
611 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 ...
5
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1answer
9k views

Bluetooth low energy Power Consumption in Sleep state

I constantly read about the low power consumption of BLE and websites stating Power consumption: Since a Bluetooth low energy device is in sleep mode most of the time - the maximum/peak current draw ...
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4answers
1k views

minimal ARM (cortex m0) board

First: I'm not a professional. I just want to know what is possible and if i'm on the right track. Second: I want a little microcontroller which just measures (for example) the temperature and send ...
4
votes
2answers
279 views

Does bbc micro bit support bluetooth 2.0

I have a bbc micro bit. It has a ARM Cortex M0 chip that supports BLE. I want to be able to send messages via Bluetooth to this usb dongle (with only Bluetooth 2.0 support). Will I be able to send ...
4
votes
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.
4
votes
1answer
187 views

We have 2 variants of device which differ only by battery. Shall we pass FCC separate FCC certification for every of them?

We developed a BT4LE device which is being shipped in two variants. They are the same except for battery variant. Is it possible for us to pass one FCC certification so that it is valid for both ...
4
votes
1answer
25k views

How to scan for all available beacons with BLE?

I'm working with a project which involves Bluetooth Low Energy beacons. Super simple schematic will just broadcast an unique number of the beacon. These beacons are used in a warehouse which is about ...
4
votes
2answers
695 views

How to select a 2.4GHz chip antenna for a space-constrained environment?

I need to use the DA14580 BLE chip for my project. The problem is for the antenna. The reference design provided for the antenna is only PCB trace that's is too big for my project: I don't know how ...
4
votes
1answer
236 views

Are Lithium Thionyl Chloride Battery usable in my vibrating environment? Are they safe?

I have to power a circuit subject to constant vibrations (10-15 Hz with an amplitude of ca 10 millimiters) with a battery and I was thinking of a Lithium Thionyl Chloride Battery. The circuit has to ...
3
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2answers
974 views

Why would uart connection only work after disconnecting power?

I am using a Microchip Bluetooth Pictail and a Sparkfun 3.3V USB-to-UART and a Arduino Uno (just for power-5V,gnd and 1 active high signal connected to 3.3V). When I power the PicTail it outputs "CMD"...
3
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1answer
1k views

What are the resource requirements (RAM, flash) of the latest nordic bluetooth smart (formerly BLE) stack?

I want to understand how much RAM and flash I have available for my own program memory and program space after I incorporate the overhead of bluetooth communication when using an nrf51822. https://...
3
votes
1answer
852 views

Bluetooth low energy communication

I was wondering if it is possible to communicate between 2 BLE devices when one is placed inside the car and another placed outside the car. Can BLE communicate in such a scenario? For example, I ...
3
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2answers
90 views

Vehicle Diagnostics using BLE?

I have a requirement where the diagnostics of a vehicle has to be carried out using BLE. The number of read/write parameters would be over 300. I had worked on BLE devices in a wearable application ...
3
votes
1answer
83 views

Best communication scheme for a battery-powered Bluetooth LE display?

I have a battery-powered design that I am working on using a Nordic NRF52832. The device is intended to connect to a smart phone and upon receiving a particular message from the phone, flash some LEDs ...
3
votes
2answers
3k views

Send custom GATT characteristics using HM-10 (actually a CC2541)

Short question - how do I send data as GATT characteristics from a peripheral BLE device (Android UNO + HM-10) to a central device (i.e. an android smartphone?) I'm working on a BLE peripheral as a ...
3
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1answer
461 views

CC2541 + ceramic chip antenna PCB design

This is my first bluetooth project, I have done several PCBs for testing with CC2541 (by TI) and I am using this balun for impedance matching with this ceramic chip antenna . I managed to use it as a ...
3
votes
1answer
556 views

How to check beacon's signal strength - nRF52832?

I want to check beacon's RSSI using my nRF52832 (PCA10040) and if the signal is strong then send beacon's MAC over UART to WiFi module. I'm having hard time understanding Nordic Semiconductor's ...
3
votes
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 ...
3
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2answers
2k views

Counting number of bluetooth 4.0 (BLE) devices near me?

Does bluetooth allow you to discover devices around you that are simply on but aren't in any discovery state? I am not trying to pair with all these devices but merely count the number around me and ...
3
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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 ...
3
votes
4answers
154 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 ...
3
votes
1answer
302 views

Bluetooth antenna on a narrow PCB

I am new to RF electronics and trying to build my first circuit integrating Bluetooth Low Energy, with quite strong geometrical constraints : the whole thing needs to fit inside a narrow 8x5x60mm ...
3
votes
2answers
1k views

Using BLE module by blueradios

I want to use the bluradios BLE module. Here is what I am talking about, Another link for the material available on the site. Now, I would like to use AT command set to program the module. The site ...
2
votes
3answers
21k views

How deep underwater can Bluetooth reliably transmit?

I know that Bluetooth operating at the standard 2.4GHz has a hard time penetrating water (I guess the water "absorbs" the signal). However, at what depth does this really start? In my case I am ...
2
votes
1answer
8k views

What is the minimum distance that BLE 4.0 capable device be programmed for..?

After Searching on Web found out that the range/Distance of BLE device transmission can be controlled by varying its transmission power and frequency. But could not get how specific can we bet on the ...
2
votes
2answers
339 views

Will most IC's operate at 100C

I'm thinking about making a self contained Bluetooth LE temperature sensor. I'd like it to be usable up to the boiling point of water. All the BTLE device seem to be rated up to 85C. Do you think they ...
2
votes
1answer
169 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 ...
2
votes
2answers
7k views

Factory Reset a HM-10

I had programmed a HM-10 module to act as iBeacon with my Arduino Uno's serial monitor using the following steps: AT+RENEW Restores factory defaults AT+RESET Reboot HM-10 AT Wait for OK AT+MARJ0x1234 ...
2
votes
2answers
468 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 ...
2
votes
1answer
733 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 ...
2
votes
3answers
103 views

How can I measure low power energy usage of bluetooth device?

I need to measure the energy usage of a small bluetooth device which is normally operated by a coin cell 3v battery. Background: Using an oscilloscope I was able to get fairly good pictures of the ...
2
votes
1answer
82 views

How do i make sure that PCB traces or Enclosure unit is not affecting the BLE 4.0 range?

I am using BLE 4.1 ready module having on chip antenna, according to datasheet i have taken care in PCB layout design that at least there should be 8 mm of distance from Antenna and copper traces from ...
2
votes
1answer
687 views

HM-11 Bluetooth Footprint

I'm using HM-11 Bluetooth module and is in layout process currently. One of the concern raised by my friend referring to the datasheet is whether the footprint lead dimension is the same in bottom ...
2
votes
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 ...
2
votes
1answer
150 views

Best technology to have a specific person's proximity in a room turn on a light outside the room

I need help deciding which technology to use so that, when a specific person (1 out of 6) walks into a room, their specific ID is recognized and the corresponding colored light is illuminated outside ...
2
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2answers
15k views

Can an iphone/android cell phone communicate with RFID?

Is it possible for a cell phone to communicate with an RFID chip? I'm looking for a low-powered solution to turn a device on/off wirelessly, using a cell phone. Example: phone sends signal to RFID ...