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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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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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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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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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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41 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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60 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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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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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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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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36 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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53 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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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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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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149 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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80 views

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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61 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
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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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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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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40 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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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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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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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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60 views

PCB Schematic Question: Is it necessary to include the antenna for the bluetooth IC? (Making my own Arduino Nano clone)

I'm trying to make my own customized version of the Arduino Nano 33 IoT. I noticed in the Arduino circuit schematic, there is an antenna specified, and it connects to the Bluetooth unit as if it's an ...
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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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31 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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51 views

BLE IoT device as platform backdoor for hackers

I have a IoT device that works with BLE and uses a smartphone as a bridge to connect to a digital platform (cloud). The communication between the IoT device and the platform is based in PKI. The IoT ...
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167 views

ESP32 ws2812fx BLE leds flicker and flash different colors

I am creating a device to use a bluetooth app to control the effects in the ws2812fx library on a esp32 thing from Sparkfun. It works great using the arduino serial monitor to update. But whenever I ...
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56 views

what is the meaning of BLE data rate 1Mbps?

I am using BLE HM10 module which is BLE 4.0 1Mbps assume I have 1000000 data bits to send within a second, so I need 1Mbps bandwidth, Is 1Mbps only for Data bits? or 1Mbps means complete ...
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500 views

MCU with ultra low energy gpio input [duplicate]

I am working on a project with an energy friendly MCU from Silicon Labs. The EFR32BG1B132F256GM32 to be exact. My goal is to use as little power as possible to maximize the lifespan of the CR2032 ...
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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 ...
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1answer
57 views

Does Bluetooth Mesh violate normal Advertising Rules?

According to Silicon Labs AN1137, Bluetooth Mesh employs two kinds of retransmissions: at the network level at each relay Furthermore the document states: The minimum delay between repetitions, ...
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24 views

What value to use for ranging TX power (BLE Eddystone-UID adverts on Laird BL654)?

I use Laird's BL654-USB dongle with smartBASIC (part number451-00003). The dongle uses Nordic nRF52840 chipset. I have a simple BLE beacon app that broadcasts BLE adverts using Eddystone-UID frames. ...
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50 views

BLE Connection Issue with Metal Case

I am working on an IoT project which using BLE (Bluetooth Low Energy). The Device Case is Metal Body. In our testing we have found that without the Metal Body the Device BLE is working absolutely fine ...
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20 views

BLE RN4020 - PC Connection

I'm trying to build simple setup to transmit serial data over BLE, from microcontroler to PC. I did similar setup in the past with Bluetooth 4.0 [RN4677 Module] - BT Connection + Assigned COM Port. ...
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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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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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Bluetooth Advertisements with multiple PHYs?

One thing I am confused about on Bluetooth 5. There are several different PHYs available on Bluetooth 5. My question is, can devices listen and/or send advertisements with multiple PHYs? What is ...
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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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38 views

Which material enclosure to avoid impeding signal of Bluetooth and wifi?

I’m making an enclosure for: https://www.digikey.in/product-detail/en/ESP32-PICO-KIT/1904-1030-ND I read that Bluetooth signal can be impeded by 37% by a plastic case. If that is so, then how does ...

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