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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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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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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46 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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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1answer
37 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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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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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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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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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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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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1answer
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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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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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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
55 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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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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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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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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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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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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1answer
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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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BLE beacons advertising frequencies collision

I'm designing a smartphone app that gets advertising transmissions from N BLE beacons that transmit to M meters (approximately), for kind-of indoor-navigation. My goal is to maximize N and M as ...
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Piconet with STM32's BlueNRG 2 Development Kit

I would like to develop a piconet using STM32 BluenRG 2 development kit by setting up one master device and multiple slave devices. Every slave is connected to an analog sensor and the master should ...
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MAC Address as Serial Number in Embedded Systems

Is it ok to use a MAC Address as a serial number in an SoC with BLE? Are there any security threats to this perhaps? Or drawbacks?
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Is it possible to use two HM-10 on two Arduinos for bidirectional Bluetooth communication?

I am thinking about using the HM-10, or some other bluetooth module on two Arduino boards for Bluetooth communication. What I want is to be able to send and recieve data from a single Arduino board. ...
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WriteCharacteristics doesn't work through ESP but is working through noble

I am trying to work on a BLE lock which is currently being operated through a mobile app using the react-native ble plx. I was trying to make it work through the ESP32 so that it can be controlled ...
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37 views

RF shield needed for BLE SoC in PCB design

I´m checking the implications of using BLE in a new design. This design will include in the same PCB a BLE SoC, the specific matching network and an anetnna (still checking if I´m going to use a ...
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Are bluetooth advertise published on one or on at least one channels?

According to the BLE protocol, when a device is advertising, three channels are used to minimize interference and a channel hopping strategy is put in place. Probably due to my poor knowledge of ...
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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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How do I wire up this item (BM70 - Microchip BTLE) for prototyping

I've just received my BM70 (Microchip BLUETOOTH 5.0 BLE MODULE) via DigiKey and I'm wondering how I can wire it up. According the BM70 Datasheet the pad holes are (are .7mm (outer) and .5mm (inner)). ...
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How to find BEAN_SCRATCH_UUID, BEAN_SERVICE_UUID and BEAN_NAME of an HM10 BLE module?

anybody know how to find the following specifications of HM10 module that i mentioned in the question using AT Commands or any other way?
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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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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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Bluetooth module PCB layout

On my PCB, I have the Bluetooth module (ANNA-B112) on the top layer. Due to space constraints, I had to put some components on the Bottom layer of the PCB beneath the Bluetooth module. The main ...

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