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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Adding a Bluetooth Peripheral to an STM32

I'm making a device that is powered by an STM32F072C8Tx. I want to add a bluetooth peripheral to this that can connect to the computer as a HID and transmit keypresses. I've considered swapping the ...
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Cheap dev boards [closed]

I’ve been looking around at different development boards like Arduino and Espressif’s products (for small IoT projects), and I have wanted something small, cheap, and easy to use. These are the ...
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Bluetooth module GPIO control

Note: This is my first real electronics project I've worked on by myself so I might just be asking a dumb question or this might be in the wrong forum. I am trying to figure out the hardware side of a ...
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Protocol for >40 IoT nodes in a small area (~5 m²) all talking to a hub

I need some advice on the wireless protocol I should use. Here are my requirements : 30 - 40 devices in a very small area (~5 m2), which need to talk to a hub placed around ~10 m away and equidistant ...
2 votes
1 answer
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Using SWRA117D 2.4 GHz antenna on a large board

I've added the board image. There is one ESP32-C3 on a 2 layer FR-4 board. My question is, how much I'm compromising with the efficiency of the antenna by placing it on a ~52X85mm board considering ...
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Reverse trilateration / multi-lateration using BLE Beacons

I'm currently working on a proof-of-concept to work out the estimated locations (longitude and latitude) of outdoor beacons with unknown locations to begin with. The solution will use a mobile ...
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ESP32 - NimBLE increase throughput

I'm doing a OTA DFU with two ESP32 to upgrade a STM32 uC. This works out reliable so far, but the transmission speed over BLE between the two STM32 is really slow and so the DFU takes up to 10min, ...
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Using a Bluetooth module without MCU

I am making an EEG using an ADS1299. To read the data I want to use a Bluetooth module and send data to a PC (I think this one should be OK) and power both with 2 coin cell batteries. Can I do this ...
-1 votes
1 answer
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How to make ESP32 wake-up signal and standby signal using Android app via BLE

I want to make an ESP32 device stand by and wake up using an Android app. I know the ESP32 can be woken up using an external source but there is nothing much regarding using an app.
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UART and BLE Simultaneously

I'm using the nRF52832 Blue Feather module. This project has an endnode (Master) and many clients (Slaves). So the endnodis e connected to an online server to collect data and send the data to ...
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Multiple simultaneous ESP32 BLE connections to one mobile device

I'm trying to find out if it's possible for at least two ESP32's to maintain active BLE connections with one Android mobile device at the same time. What I'm basically trying to do is to send analog ...
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PS2 Controller to Bluetooth HID Gamepad

I'm planning to make a PS2 Controller Bluetooth Adapter similar to what EvanKale did in his Bluetooth PS2 Controller [Instructables][www.instructables.com/Bluetooth-PS2-Controller/] and Bluetooth PS2 ...
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How to improve RSSI on ESP32 BLE device [closed]

I'm testing an ESP Wroom 32 as BLE device (BLE server) using Arduino IDE and this setup: ...
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Is it possible to make a BLE HID without a microcontroller like an Arduino?

I am in a vocational highschool. I have a project where I have to make a HID like a keyboard or a mouse (wired) into Bluetooth wireless. I've read many articles before like using an Arduino Pro Mini 3....
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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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3 answers
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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 ...
1 vote
3 answers
572 views

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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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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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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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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