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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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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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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What are the resource requirements (RAM, flash) of the latest Nordic Bluetooth Low Energy (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://...
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Longer time between BLE advertisements

Is it ok to increase the time between BLE advertisements to longer than 10.24 seconds? I know 10.24 s is the longest time I can set for the advertisements to automatically repeat, but I can also ...
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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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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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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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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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395 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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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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32 views

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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22 views

Latency of BLE GATT Read Value Operation

Latency of BLE GATT Read Value Operation Assume that a peripheral and central BLE devices have a connection established. Central is running a GATT service with a particular characteristic. ...
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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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36 views

Please help identify the positive and ground for BLE antenna

Please help identify the positive and ground for adding an external BLE antenna, after the chip antenna was removed. I am connecting an external antenna (not the removed one) to this Nrf51822 BLE ...
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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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2answers
61 views

RN4678 Does Not Enter Command Mode

I've been trying to get the Microchip RN4678 bluetooth module working so I can start having fun with it, but I'm having very very limited success. The problem is the fact that the datasheet states: ...
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252 views

BLE and Bluetooth Classic Coexistence?

we are designing a fairly compact PCB for a communications device. We are looking at using BLE as a link for voice to a separate microphone, and BT Classic to be paired with a smartphone. We are using ...
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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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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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2answers
152 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? ...
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148 views

How add a chip antenna for the Bluetooth of the module BCM4339?

I have the following concern in a design that I am carrying out. I am working on the development of an electronic prototype that uses as a CPU the module: PICO-IMX6-SD. This module has wifi and ...
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1answer
33 views

Bluetooth low energy multi peripheral topology

We are trying to read data from 8 BLE peripheral. When using single peripheral, the peripheral device was sending notify to the central side(this fire a callback on central), ensuring lossless data ...
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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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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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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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265 views

How to associate RX/TX of the BLE RN487x with a LED?

I assembled the scheme suggested by Microchip for the Bluetooth Low Energy BLE model RN4871, pointed out in the schematic of FIGURE 5-4 of the Datasheet (page 26). I've connected a led to Pin 12 (P0_2)...
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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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47 views

How to choose an appropiate antenna?

I want to increase the Bluetooth Low Energy transmission range of my ESP32 with IPEX connector. How can I select the right antenna? Do I have to take a look only at a 2,4 GHz WiFi antenna, the antenna ...
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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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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
171 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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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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316 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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3answers
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Any modules which can measure the distance between two modules even through obstacles?

This is for a social distance enforcing project for school. I want to know the distance between Module 1 and Module 2, where each module is worn by a person. Usually ultrasound would be used, but 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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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
27 views

Zigbee and Bluetooth co-existance

I am looking for the best way to add both Bluetooth (LE, central) and ZigBee (Coordinator) to my hardware project. There were trials to integrate BLE (peripherial) and ZigBee (End Device) into one SoC:...
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26 views

90 degrees rotated MIFA 2.4GHz Antenna reference design?

NXP offers a reference design of a MIFA antenna for the 2.4 GHz BT LE frequencies. On page 4 of the PDF the design is shown: For my application this reference design is too wide; does anyone know of ...
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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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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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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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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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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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1answer
38 views

How to use two antennas with a single Bluetooth module? (BLE repeater)

I am working on a project that uses small Bluetooth low energy (BLE) beacons to track important items. However, we have run into a situation where one location will store these items underground in a ...
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2answers
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Is it possible to calculate the Time of Flight between two Bluetooth devices?

I want to calculate the distance between 2 Bluetooth tags (still need to be developed so no restrictions in components). The tags will not be time synced so we would like to calculate time of flight ...
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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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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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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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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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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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