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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How to analyze Bluetooth Low Energy traffic in Wireshark

I am trying to analyze the traffic captured for a blue Bluetooth Low Energy device in wireshark. I have figured out that data is transferred using the ATT protocol, but I do not see anywhere that ...
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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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Register 2 peripheral UUID with 1 service, NRF52

I have 3 nrf52 boards: 2 act as peripheral and 1 as central device. I want to register 2 different UUID's for the 2 peripheral devices, which contain the same service (0x0001 - NUS for example). I ...
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1answer
237 views

Alternative wireless technology for passive RFID tags

I am working on a project where I have 3 boxes and a RFID reader (mfrc522) attached at the bottom of each box. I keep my wallet/keys/etc in these boxes and a LCD screen displays what is in each box ...
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479 views

nRF52832, using a chip antenna for short range purposes

In the past I have used nRF51822 to make small low powered devices for projects. I have used allready made modules from china (WT51822-S2) and programmed them using mBed. It was really easy but not ...
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617 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 "...
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112 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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1k views

Bluetooth low energy: effect of slave latency on power consumption

Slave latency is meant to allow a bluetooth le slave to skip a certain number of connection intervals before actually establishing a connection event with the master. In principal, this seems like it ...
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1answer
41 views

Does Bluetooth Low Energy need advertising channels for reconnecting?

In BLE, 3 of the 40 channels are used for advertising. If two devices are in the midst of a connection, the continuing communication hops about the other 37 channels with no "wasted" power. ...
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0answers
22 views

Bluetooth advertisement packet format restrictions

Are there any firm restrictions on the formatting of advertisement data and scan response data for Bluetooth Low Energy? The sample projects I'm learning from start the advertisement data with some ...
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0answers
42 views

How to increase the range of BLE chip RN4871

I have an RN4871 Bluetooth chip and integrated it with my micro. The chip is scanning for nearby BLE devices and reporting them to the host micro via UART. However, I see that the range of this chip ...
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32 views

Powering ESP32 LDO or Buck converter

im designing an ESP32 system with three haptic drivers. Description of the system: 3 Drivers: 3.3 V 15 mA ESP32-pico-D4: 3.3V Sleep mode: 50 mA Active mode: 150-300 mA Antenna: Compact Reach XtendTM ...
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1answer
54 views

How to calculate Pi filter for RF with PCB antenna - Nordic nRF52832

I have finished the layout of a bluetooth beacon based on SoC nRF52832 of Nordic, there is a Pi filter between the IC pin and the antenna that use the AN043 drawing of Texas. AN043: https://www.ti.com/...
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1answer
41 views

BLE (blue tooth low energy) : what is the difference between encryption and whitening regarding to packets?

In BLE, what is the difference between encrypted packets and whitened packets? Is the whole packet encrypt/whitened or just the payload? I know that whitening is used to "whiten" the signal so there ...
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54 views

Is it possible to transfer a bluetooth signal via something else?

Problem: For example, I have 2 devices communicating with each other via bluetooth. But there is a thick metal wall between these devices and this makes a difficulty between them. To fix it, can I ...
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1answer
50 views

How to interface a microphone to an I2S input to use HFP

For my group's SDP/Capstone we are doing a bluetooth headset of sorts. We are using a CYW20706 SoC from Cypress. Specifically, we are using a this CYBT-343026-01 Cypress module whch includes that ...
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38 views

BlueNRG-2 from STMicroelectronics Range Problem

I have configured my Bluenrg2 with the help of a Bluenrgsdk module with Data Length Extension of 251 bytes and ATT_MTU as 247. I ...
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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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0answers
56 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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208 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
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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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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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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94 views

Bluetooth LE (BLE) pairing behavior

I played with a BLE device recently (VSN V.BTTN) and was able to get interesting functionality with the button and a Raspberry Pi. However, I still have a few questions regarding the device pairing ...
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456 views

Tuning Chip Antenna

I am designing a BLE board with nrf52832. This is the first time I am designing a board having a RF part. After considering MIFA ...
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283 views

How is BLE data converted to UUID (and how can i convert it back?)

I am developing a BLE Android application that can receive small messages from a beacon. As a test I am letting the beacon increment a counter and send this as a string (service_data=str(counter)). I ...
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1answer
231 views

nrf51822 BLE beacon not always discoverable - how to choose the correct flag?

I have some BLE beacon modules (Radioland Beacon) using the Nordic nrf51822 and I want to make an indoor positioning system with them. There is a problem with my beacons that they are not always ...
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1answer
821 views

Power Consumption for BLE advertisements

I have a set of voltage readings that are read at a high rate and they have produced voltage data for power consumption while: advertising events, for connection events, and for no activity. I've ...
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366 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 ...
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337 views

Using nRF8001 as a master with an FPGA

I would like to use Nordic's nRF8001 modules in Master and Slave modes and also would like to connect it with Spartan-3E FPGAs using SPI. I am considering buying the nRF8001 DevKit. I believe it is ...
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21 views

BMD-350 Erratic Current Consumption BLE

I recently designed a PCB and have been testing it.The PCB mainly consists of the Bluetooth Module BMD-350 and HX711.( There is an accelerometer and RGB-LED as well but we haven't mounted them yet). ...
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31 views

Incorporating Additional Devices in Custom PCB

I've been tasked with designing a custom PCB based on a prototype I made this past year. This prototype uses ST's NUCLEO-F030R8T6 development board along with some stepper motor drivers (AMIS-30543) ...
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1answer
39 views

ESP32 receive BLE data and send via WiFi possible?

I searched quite a long time now but I'mstill not sure whether it's possible using (just one) ESP32 module. What I need/want: I have some sensors sending their data using Bluetooth Low Energy about ...
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21 views

Restarting ESP8266 NodeMCU in DeepSleep with a signal from HM10 BLE

I'm building a simple project in which I put the ESP8266 NodeMCU board in DeepSleep mode, so I can save some battery since it's powered with 4 AA batteries. What's the problem? I don't want my ESP to ...
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1answer
37 views

Low power temperature monitoring

I'm trying to monitor the temperatures at various location inside and arround my house. So far, I used battery powered (18650 Li-Ion) ESP8266 chips with a DHT22 sensor. The ESP wakes up every 5 ...
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47 views

The microchip Bluetooth?

I am beginner in electronics, I am wonder about microchips that can transmit data between themselves using Bluetooth. I want to play around with them like the estimate connection, send data, receive ...
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1answer
31 views

How BLE central determine the connection interval

After connection established between central and peripheral, they start communicate at specified intervals called connection interval. As far as i know, the interval determined by central not ...
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0answers
155 views

How to make 2 or more bluetooth devices(ESP32) get RSSI Values(signal strengths) of each other?

I am creating a prototype for a Social distancing tracker using bluetooth devices, wherein if 2 bluetooth devices come in close proximity(measured with signal strength), then both modules send their ...
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1answer
62 views

Cannot get BLE module to initialize

I designed and had manufactured a custom version of the Arduino Nano IoT 33 (basically the same, except it has some additional ICs on the PCB). It is working just fine when I program using the Arduino ...
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1answer
54 views

STM32 BLE profiles - multiple sensors active ST BLE Sensor App

I have done the MOOC for the stm32wb55 BLE profiles and now I am trying to introduce more BLE characteristics. I managed to make the sensors work and to transmit them to the ST BLE Sensor app. However ...
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34 views

Bluetooth Low Energy IoT device compliance

I´m designing a bluetooth IoT BLE device and have heard that making use of the Bluetooth logo in the device implies an annual fee for Bluetooth SIG. I would like to know if this only applies to the ...
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2answers
47 views

How to estimate the peak power of BLE?

I am trying to determine my battery sizing for the NRF52840 BLE. To do so, I want to estimate the peak power. But I am struggling with this. Is it safe to go with transmit current as the peak ...
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42 views

STM32WB - sensor data sent via BLE and saved on SD card (SPI)

I have an STM32WB and I am trying to get the data from some pressure, temperature and humidity sensors through DMA and send them to my Android via BT, while at the same time saving it as well on a SD ...
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23 views

Bluetooth Broadcasting (BlueNRG-2)

I have a few questions regarding the use of the BlueNRG-2 device I am building a system where I have to send small data packets (10 bytes) from 1 unit to 10+ units. I am aware that you can only have ...
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0answers
30 views

Verifying an existing Micro chip RF component range with my calculations

I'm trying to understand how the microchip RN4871 chip range is calculated. I know the chip Antenna used in this module. According to its datasheet, RN4871 has a range of 10m. So my calculations ...
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38 views

Antenna range calculation

I'm trying to build a microstrip antenna for my BLE module to increase its range. I'm more of a hardware Design and firmware guy and the last time I designed an antenna was in college back in 2015. ...
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27 views

BLE (blue tooth low energy) : what is the max length of a packet? (encrypted and unencrypted)

According to BLUETOOTH SPECIFICATION: "The Length field of the Header indicates the length of the Payload and MIC if included. The length field has the range of 0 to 255 octets. The Payload field ...
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11 views

TI Chip Datasheet for CC2541 does not have bluetooth interfacing instructions?

So I'm a bit confused how I might interface with this chip here http://www.ti.com/lit/ds/symlink/cc2541.pdf. It is BLE enabled and I've written a barebones iOS app to connect via bluetooth to the chip....
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1answer
42 views

Questions about designing my own BLE-controlled LED device

This project is meant to get me familiar with designing my own PCB and working with lower-level components. I have experience with BLE using Arduino shields and BeagleBones, but I want to try building ...