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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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0answers
547 views

Microchip RN4870: Can I create a custom GATT Characteristic Descriptor?

I am reading through the RN4870 user guide documentation to try and work out how to implement a HID GATT Service. When I look at GATT specification viewer for the HID service, specifically at the "...
3
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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 ...
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1answer
830 views

Does Bluetooth 4.0 penetrate concretes?

I am working on an application where I want to make wireless communication between two embedded devices. The core problem here is that I want to put one of these devices in a room that's totally built ...
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1answer
157 views

Circuit to switch power between Battery and main Source for BLE Module

I am power a Bluetooth module (referenced as BLE) operating at 3.3v. The module has a microcontroller inside and we want to keep the RTC working all time for scheduling, which means in case if the ...
2
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1answer
2k views

programming a BEKEN BK3431 bluetooth 4.0 ble tag chip

I have few BLE tags, with button+led+buzzer (AKA "iTag"), I opened them up and saw it's based on one chip: BEKEN BK3431. I have access to the following JTAG/test pads: VCC3V | GND | P05 | P04 | ...
2
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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 ...
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1answer
224 views

How to validate 32k crystal for BLE?

I am designing with nrf52832 and experiencing some BLE connection issues at 0C. The system gets disconnected every few seconds with 32k crystal, but no issue with internal RC oscillator, so the issue ...
3
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1answer
458 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 ...
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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1answer
75 views

Cost effective way to communicate data between a force resistor and a raspberry pi / Arduino

I am looking for a cost effective way to communicate data between a force sensitive resistor FSR402 to a raspberry pi/Arduino wirelessly. I am open to using BLE / WiFi / Radio Communication. The ...
0
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1answer
41 views

Bluetooth Trasmitter [closed]

I am building an app that is supposed to detect a bluetooth signal from a device. I have been looking at a lot of blueotooth 4.0 boards but I am clueless as to what I need or what other components I ...
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2answers
142 views

Track movements of 500 objects in one single room [closed]

Let's say we have a room with a size of approximately 300 sqm. In this room we have 500 objects that are tagged with beacons having accelerometers. Is there any way to process the produced data of ...
0
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1answer
114 views

Setting up individual Bluetooth chips/modules

I have a general question about how BlueTooth chips are set up: When you are setting up a bluetooth chip (i.e. installing the firmware which will make the chip do what it needs to) the chip is ...
0
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2answers
112 views

Which remote communcation type should I use?

In my project I have to give only 4-digit number to each device(50+ devices) without any wire. And there will be only one transmitter for all receivers. Which communcation type should I use? ...
2
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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 ...
0
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1answer
622 views

How is signal strength (RSS) measurement done on Bluetooth and Zigbee ?

My question is related to an observation that I made. I tested BLE (Bluetooth Low Energy [ti2541/nRF51822) and ZigBee (ti cc2531) against each other on jumpiness of the signal strength (RSSI). Both ...
0
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1answer
112 views

The RX of a BLE device needs to be on to wake it up via BLE?

So some BLE devices have sleep mode which allows it to consume less power (significantly less, in the order of uA). In this state (I think) the radio (RX and TX) is off. So there's any way to wake it ...
0
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1answer
1k views

HM10 bluetooth module to discoverable state after connection break

I am trying to setup a HM10 (or similar Bluetooth LE to serial module) but am having problems with it. The problem is when I am connected to the device with my phone, it works great. Now, if I force ...
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2answers
401 views

FCC Requirement for device to device output power variability?

I'm working on a BLE capable device using the Nordic Semiconductor nRF52 SoC, and we're going to have to go through FCC testing. But one thing that I am not clear on, at all, is the tolerance in ...
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1answer
421 views

Microcontroller for BLE beacon scanning [closed]

A client asked my company, alongside of another project we're running with him, if we could provide him with a device, which only task is to scan for the beacons he bought and upload the result of ...
5
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1answer
8k 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 ...
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 ...
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1answer
74 views

Which wireless module should I use for 40Kbps communication with low-power consuming?

I'm now making battery-powered wireless high-refresh-rate AHRS module and it needs continuous wireless communication around 40Kbps(160bit * 250packets/s) with iPhone. What I found were Wifi-direct, ...
0
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1answer
90 views

Best way to get exact proximity between devices [closed]

Need to get exact distance between devices like beacons or RF devices, exact means; about ~10cm tolerance. Here is what I need; I will use some devices like RF module or beacons on road and I need to ...
4
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2answers
278 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 ...
0
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1answer
600 views

Improve the time of BLE beacon scan

I have 3 Atmel MCU based BLE scanners, each uses TI CC2540 based BLE module (PDF User Manual) chip to scan for the advertise packets (bluetooth Beacons) around. There are approx. 10 Beacons at a time ...
4
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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 ...
0
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1answer
661 views

Regarding RN4020 and MSP430 interface

I have recently started working (no previous experience of working with BLE) on BLE2 click module (RN4020), I could successfully connect TTL-USB cable to my laptop and could communicate with the ...
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3answers
5k views

How can i extend Bluetooth range at maximum?

I want to extend at "maximum possible" the range of my Bluetooth Low Energy chip, Nordic nRF51822. I have no limits of space, transmit power or energy requirements so i can use whatever i want. I was ...
3
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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 ...
0
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1answer
173 views

Need reference materials for BLE hcitool?

I am preparing commands for FCC certification. I got some hcitool commands from the BLE chip vendor, but not sure what it means. What is ocf, ogf? What is OCF=0x0051 or OGF=0x3F? Looked around the ...
2
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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
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2answers
91 views

LC circuit of buck converter in nRF8001 datasheet

In the datasheet of the nRF8001, they specify in the reference schematic (page 51) the LC circuit to use with the integrated DC/DC converter (see below). Why is there a small inductor L5 in series ...
2
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1answer
686 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 ...
1
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1answer
455 views

nrf24 bluetooth image transfer

I'm trying to build "arducam-bluetooth-module-wireless-image-system" using an NRF24L01. I wish to have a long range transfer of a single image from a remote location to my Android phone whenever it ...
1
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1answer
204 views

More energy efficient: writing in a SD card or transmitting by BLE for long period?

I need to store about 1 adc sample per second on a wireless project for about 10 hours. The problem is the energy. What is more efficient a constant transmission on BLE or writting each second on a SD ...
0
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1answer
1k views

Why max BLE Tx power is 4dBm?

Anyone knows why BLE Tx power is 4dBm max? Does it have anything to do with coin cell battery peak current limit (15mA)?
1
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1answer
94 views

How to dive into IoT world with just high-level programming experience [closed]

I came from a high-level programming world and recently got a bit bored. Now I want to dive into IoT subject and start a hardware side project. I was thinking if there is a Hello World IoT tutorial, ...
0
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1answer
63 views

How come nRF51822 evaluation kit isn't recommended?

Looking at the nRF51822 Evaluation Kit's page, it explicitly states that it's not recommended and is replaced by nRF51 DK. Does anyone know in what ways the nRF51 DK is an improvement over the ...
0
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1answer
158 views

Bluetooth device spurious emissions test

I'm reading an outline of spurious emission test for Bluetooth devices which states that The Equipment Under Test (EUT), a Bluetooth module is switched to a test nullmode in which it generates ...
0
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1answer
2k views

Beacon: dBm power decrease over distance

I have beacons which advertise their configured data periodically through Bluetooth. The vendor specifies 8 different power options 0 to 7: https://support.kontakt.io/hc/en-gb/articles/201621521-...
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1answer
154 views

Miniture bluetooth enabled accelerometer with API or SDK [closed]

I'm getting into electronics as a hobby. For my first hobby project I want to build something like a super simple fitbit. To achieve this I need a bluetooth enabled accelerometer. I've had a look at ...
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1answer
982 views

what's the purpose of multiple channels on Bluetooth Low Energy

a question I'm asking (perhaps its stupid) is that, on BLE (Bluetooth Low Energy) why do we need 40 channels?. 37 of these channels are used for connection data and the last three channels (37, ...
1
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1answer
3k views

Increase HM-10 Bluetooth range

I recently purchased this HM-10 board. I can connect to it and everything, so it works perfectly. I ran into a problem, the range is only around 7 feet. How can I increase the range? I need it to go ...
1
vote
1answer
383 views

Difference is Bluetooth Smart and Bluetooth audio

My name is Raveen Baloo. I have been doing a lot of research on the types of Bluetooth module. For my project, i do need a bluetooth which will be able to have simple communication with a mobile app, ...
2
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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 ...
0
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1answer
553 views

Dual mode Bluetooth for transmitting audio and connecting with an App [closed]

​Hi my name is Raveen Baloo from Singapore. Currently, I'm working on a project, building a case box which has a MCU and a LCD screen. A removable bluetooth dongle is connected to the case box which ...
0
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3answers
272 views

Syncing 50+ wireless sensors

I am creating a set of 50+ remote imu sensors. They will all be in a small distance from one another. Less that 3 meters. Each remote board will have a on board sd card for logging the imu data and a ...
4
votes
1answer
234 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 ...
1
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1answer
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 ...