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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Multi slot advertisement on Bluetooth

I'm using BlueNRG-M2SA in a project. This device sends the same advertisement data on every selected channel. I'm looking for a way to send different advertisement payloads on each channel. For ...
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Why is ESP32 BLE so power hungry?

The ESP32 consumes around 100-130mA when BLE is active and transmitting, while other BLE chips like nRF8001 only consume around 13mA when BLE is active and transmitting. Am I missing something, or ...
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Going from AT-09's (BLE) Breadboard to it's SMD version

I want to go from this, https://www.amazon.com/Android-Bluetooth-arduino-Wireless-Compatible/dp/B07VDJR4JF?th=1 to this https://tiendaityt.com/modulo-bluetooth/9442-at-09-smd-modulo-bluetooth-40-ble-c-...
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Using a CC2540 (BLE) in a PCB

I am currently trying to place an CC2540 on my circuit. I have a circuit using an AT-09 module that uses a CC2540 but I am trying to separate the CC2540 from the AT-09. I am using this diagram, https:/...
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How do I convert a AT-09/CC2540 BLE module onto my own PCB?

Do I need to take the entire AT-09 module or can I just solder on the CC2540 module? Also, what is the plastic cover on the AT-09 for (I'm guessing signal interference)? Is it necessary to have? I ...
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PCB design for BLE module ( BlueNRG-2N )

I am designing a custom board (STM32L476 MCU paired with BLE connectivity, among other components) and after search decided to use BlueNRG-2N module along with Antenova A5839 antenna. Tried to follow ...
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OTA via BLE on Cypress CYBLE-222014-01 Module

I have developed an application using the CYBLE-222014-01 module which acquires a set of data and transmits it over BLE. Now I would like to add OTA functionality to this project, however the ...
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Blocking BLE Chip Antenna from picking up signals in one direction

I am designing a BLE scanner/observer which uses a ceramic antenna. I was wondering if there is any way to design the PCB such that the antenna chip only picks up signals from in front of it instead ...
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Extend range of BLE devices

I would like to extend the range of two BLE devices. The first one is a VR BLE controller with a monopole pcb antenna. The second one is an ESP32 Tinypico with a chip antenna. I bought two pcb ...
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Arduino Mbed bootloader on nrf52840

I use a PCB that I designed on which is mounted the E73-2G4M08S1C from Ebyte (nrf52840). I flashed the Arduino Mbed bootloader with SWD and a J-Link (J-Flash) probe with no problem. My computer then ...
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BLE UART module for music?

I'm pretty sure the answer to this is no but wanted to get some thoughts (particularly the glaringly obvious info I'm missing). My intent was to take a wired over-ear headphone set and make it ...
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EMC issues for BLE certifcation

We have two different products but identical when it comes to the BLE SoC layout and almost identical otherwise besides an extra MCU on one of the products, which is on the bottom layer of the board. ...
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explanation schematics stm32

Can somebody explain to me the followings symbols in this schematic? "≫" . See pins 2(BLE_TEST8), 3 (BLE_TEST9), 4/7 (BLE_INT) "⌒NC". See pins connected to USART2_TX/RX "⌒0R&...
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Bluetooth antenna on top of large metal object and other RF questions

I've been doing some research on RF antenna design considerations but haven't really found anything close to the situation my device will be in. I am designing a wireless sensor for my FSAE team that ...
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BLE: HM10 indicate no read property when characteristic has read property

I am attempting to use HM10 as central to read data from a sensor. The HM10 has been flashed with the latest firmware V710 to use the self learn functionality. Here is the list of messages I am ...
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Measure ball speed with sensor inside

I came across a product which is a ball with a small Bluetooth sensor placed inside. This sensor, coupled with an app, can measure ball speed, height and length of throw. I wonder how this is possible,...
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Can ESP32 BLE be server and client at the same time?

I'm trying to make smart social distancing circuit for COVID 19. I plan on using ESP32 for this. But it would be good if ESP BLE could be client and scan for other Bluetooth devices at the same time. ...
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WiFi Beacon working as BLE Beacon

I had this idea of a WiFi Beacon that works just as a Bluetooth BLE Beacon. I tinkered around with some DIY Bluetooth beacons, like building my own iBeacon for distance measurements. But my questions ...
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Help me pair with multiple Android devices using HM-10 BLE

I have a simple home automation project using an Arduino, HM-10 and relay to switch ON/OFF a connected load using an app made in Kodular (free online APP creation site.) The HM-10 BLE module is ...
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Bluetooth scan response and inquiry response

I was trying to understand basics of Bluetooth. I have few queries regarding the scanning and advertising of classic and low energy Bluetooth. Where is EIR data (classic Bluetooth) filled in extended ...
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How to VNA-calibrate a soldered coax with a 0201 50 ohm load at 2.4 GHz?

I need to tune a tiny ceramic antenna for Bluetooth Low Energy and I'm somewhat new to these high frequencies... I soldered a 0.81 mm diameter coax right before the Pi-network pads and want to ...
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Serial to USB-Host CDC

I have a device that includes an USB-B port and, when connected to a computer, it appears as a virtual serial port and I can send AT commands to it. I'm trying to create a board that will include an ...
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Wake up MCU with radio signal using a battery

Currently I have a project that runs with the chip from Arduino (Atmega328p). This is what it does: It wakes up. Powers the NRF24L01 module. And it configures it to only send one packet ...
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ESP32 esp-idf BLE Server (Print received data)

First of all, thanks for reading this question. I'm developing an application which involves a keypad. This keypad stores passwords and if the password matches, the ESP32 sends a signal. This part of ...
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In BLE pairing procedures, which channel is used for communication?

I'm working at electronics company. And I was wondering which channel is used until two BLE devices are paired? Does it use advertisement channel to exchange required information to pair? Or once ...
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Measure a circuit (small system current consumption using power source

I am powering a chip (CY8CKIT-143A). It is a BLE module + micro-controller. I am using it to transmit the data of a thermistor. I am using a DC power supply (Agilent E3644A). I am powering the system ...
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Is there a straightforward way to transfer data from a BLE module to my PC?

I'm trying to send some sensor readings from a BLE module (RN4871) to my Windows 10 laptop. I have no problem sending them to my phone and receiving them on a serial Bluetooth terminal. I also have ...
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STM32WB Client Mode - Receive from Peripheral

I have been working on an embedded system, which requires a BLE connectivity to a standard OTS cadence sensor defined by Bluetooth SIG (https://www.bluetooth.com/specifications/specs/ CSCP and CSCS). ...
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Clarification on BlueNRG-MS API

I'm building a BLE peripheral device using the ST BlueNRG-MS chip and need to implement a few features where I'm not really sure what's the right way to go. This is my first BLE project so maybe ...
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2.4GHz BLE and 900MHz LoRa coexistence

I am working on a new design for a simple BLE to LoRa bridge. I have a chip antenna for LoRa that covers 868-915MHz and I was following the Nordic reference design for the 2.4GHz BLE antenna. What ...
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Antenna array for BLE

I was reading some articles about indoor positioning using BLE 5.1 and I saw that they use antenna arrays to calculate the Angle of Arrival and Angle of Departure of the signal. What kind of antenna ...
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Temperature monitoring over Bluetooth

I bought this temperature + pressure + other things sensor that operates over bluetooth. Here it is : https://ae01.alicdn.com/kf/HTB1HebxRSzqK1RjSZFjq6zlCFXaH/Module-de-capteur-d-acc-l-ration-de-...
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STM32WB55 NUCLEO CONNECTION WITH SMATRPHONE USING BLE

I'm trying to find a solution for my project about connection between STM32WB55 NUCLEO and PHERIPHERAL DEVICE (SMARTPHONE) via BLE PROTOCOL. I can transmit more than one "enviromental sensor"...
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BLE emission when disconnected and waiting connection

I'm working on a toy device that goes into an airplane. It is using a BLE device and yet my knowledge about is a quite limited. If I understood correctly, usually in protocols: the device advertise, ...
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nRF52840 with optocoupler and mosfet

I would like to make a switch which will be able to switch on/off 12-60V low current devices using nRF52840, optocoupler and mosfet. I found this schematic and my idea was just to adjust R1 because ...
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Is a dedicated bandpass filter chip really neccessary for the BLE antenna of STM32WB?

I am designing a custom STM32WB board. Checking the reference boards of STM32WB (Nucleo and Feather board) I noticed a dedicated multilayer ceramic bandpass filter in the matching/tuning network path. ...
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Where should I place my RF test point?

So I am starting to make my first RF circuit board. We will be using a PSoC4 BLE chip as the transceiver. I'm doing my best to follow their application notes, specifically this one. I should add an ...
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What technique is more suitable for multiple (10+) simultanious bluetooth communications? CC2564

I am developing an industrial hardware that communicates via BLE 5.0. The design is this: multiple devices: (10, 20 devices) communicates with an high bitrate (around 20 bytes every 50 ms, so around ...
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Does CSR1012 need an external non-volatile memory for this application?

I am building a IoT device in which data is fed from I2C to CSR1012 BLE IC and the CSR1012 then transmits the data. CSR1012 is programmed as a master MCU. I need over-the-air update capability to ...
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USB vs Bluetooth power saving

I need to transfer almost all kinds of data (arrays, video/audio stream, control signals) between mcu and an Android smartphone. MCU will accumulate data from smartphone and further send it by other ...
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Schematic review: STM32 Bluetooth antenna

I am working on a device based on the STM32WB55xx line of microcontrollers. In the latest revision of the PCB, I altered the antenna filter and chip antenna components to better match the device ...
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What is the best low power wireless transmitter?

I would like to send a sensor signal (e.g. Temperature) wirelessly to a computer for a short distance (e.g.3~5 meters). The challenge is I have a very low power source (3V 50mV). I am thinking of ...
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BLE chip antenna matching

Hi I'm using a BLE module connected to a chip antenna, the antenna manufacture establishes the path width is .4mm, if I need to match the network to 50ohm how can I do it? the system has a pi-match C1=...
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What would be the best, cheapest, smallest way to power a Bluetooth bone conduction headset project?

Please, be forewarned, I'm an idiot when it comes to electronic builds. The last thing I soldered was a pick-up in a guitar kit I built, and the thing still isn't grounded right. I'm trying to build a ...
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BM70/71 implement A2DP audio source

I apologize if this question is too vague, but I only have a basic knowledge of embedded systems and I know very little about bluetooth. I am researching for a project in which I want to use a BM70 or ...
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Recognizing the COM port used with STLINK

I'm using a STM Nucleo as a bridge to flash a BLE EM9304 module and another ST-LINK from another STM Nucleo to flash a STM32. Both MCU are in a third board. So, I'm integrating the sequence of ...
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Does anyone know what this SMD IC labelled "HuANA" is? I'm having a hard time finding its datasheet on the internet

I am troubleshooting a Xiaomi M365 e-scooter. After checking for problems in the dashboard, I found the BLE controller's supply pin is grounded/shorted with the ground. I found this SMD IC "HuANA&...
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Are BLE attribute handles constant?

Say for example you have an embedded peripheral BLE device which has a single BLE service with some characteristics and the initialisation order is always the same (service is added, then ...
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Low latency wireless trigger

I am working on a project consisting of a sensor and receiver connected via Bluetooth 5.2. When the sensor receives a start signal from the receiver, it will begin sampling readings at ~10kHz and ...
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How is the data transferred from smartphone app to ESP32 using BLE? (flutter)

I am trying to send data to an ESP32 using a smartphone app. I am using the flutter_blue package to do so. I am having issues understand the whole communication process between the 2 devices. So I am ...
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