Questions tagged [ble]

Stands for "Bluetooth Low Energy." BLE (also "Bluetooth LE") is a variation of the Bluetooth wireless standard designed for low power consumption. It was introduced by the Bluetooth Special Interest Group (Bluetooth SIG) in December 2009 as part of the Bluetooth 4.0 specification.

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Sending Strings from NRF24L01 to app

I want to send pushbutton status from the nrf24l01 module to the app named nrfConnect. I could only find libraries that allow me to send float values. How could I send String values to the app? Thank ...
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Write a Struct using ArduinoBLE library

Hello I'm trying to send some Structs such as: typedef struct __attribute__ ((__packed__)) myohw_command_set_mode { myohw_command_header_t header; ///< command == myohw_command_set_mode. ...
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46 views

Antenna for ESP32-pico-d4

I am currently playing a bit around with the esp32-pico-4d, it does not have an onboard antenna, so an external antenna is needed, tho I don't know a lot about it so a little help would be appreciated....
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Arduino Atmega32U with nRF51 BLE by Adafruit limited to 5 second update rate?

Would like to ask for assistance with the code below. It's the Adafruit Bluefruit Atmega32U LE module with Adafruit's Arduino IDE example "heart-rate monitor" sketch. The code uses the hardware SPI ...
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HM-10 controller is not responding to AT commands

I recently purchased new HM-10 module, because old one was clone and it lacks AT+TYPE command. I connected it to my Arduino and I don't know why but I cant see any response in SerialMonitor. I even ...
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HM-10 BLE controller is not responding to some AT commands

I have HM-10 BLE controller and it is not responding to some AT commands which I need to use. AT commands which don't work: AT+TYPE2 returns +TYPE=0 AT+VERR? not responding AT+VERS? not ...
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37 views

Subscribing to Bluefruit LE Friend with ArduinoBLE not working

I've been using an Arduino Nano 33 BLE to communicate with my PC over the BlueFruit LE Friend's UART characteristic. Using the default ArduinoBLE library, I'm able to connect to the BlueFruit from the ...
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37 views

Bluetooth multithreading

I'm using my Arduino to make a speaker-like device. Instead of sound, it receives the beat of the song, thus the data comes in an array of floats. Each item in the array is a timestamp, an LED is ...
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1answer
180 views

Send/receive data from/to Raspberry Pi to/from Arduino with HM-10 (Bluetooth LE module)

My goal is to send a string from an Arduino via an HM-10 bluetooth module to a Rasperry Pi. I do this today by connecting the HM-10 on the Arduino to another HM-10 module (master/slave) and then from ...
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1answer
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How to connect RedBearLab BLE shield (Or how to find Nordic_nRF8001.h)?

I am trying to explore the possibilities of connecting an Arduino to Phonegap/Cordova. I have a RedBearLab BLE Shield, which I want to test the connection with. My MVP would be to get the value of a ...
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Connect more than 4 BLE clients to ESP32 BLE Server

I want to create some buzzers connected via bluetooth for a quiz show. I got several ESP32. One of them is the master (BLE Server), the other ESP32s are the buzzers (BLE Clients) with one big button ...
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Error compiling for board Arduino Nano 33 BLE

I am trying to use pulse sensor with Arduino Nano 33 BLE sense, but when I verify it, it shows Error compiling for board Arduino Nano 33 BLE. The code is from the pulse sensor website. The code works ...
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Cheaper alternative to Arduino Nano 33 IoT with BLE?

The Arduino Nano 33 IoT looks great with its builtin Bluetooth chip. At ~€20 (Germany) it's pricey though and seems overkill for what I need anyway. What is a good, cheap alternative for a simple ...
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ESP32 WIFI and BLE power status

Regarding the esp32, I am wanting to understand a couple of things related to both wifi and ble power control. 1.) How can I do a status check on whether both the ble and wifi radios are powered/...
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How to quit flash mode on HM-10?

I have an HM-10 BLE module connected to Arduino Leonardo. It forwards UART from my computer: #define btSerial Serial1 void setup() { Serial.begin(9600); while (!Serial) { delay(50); ...
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Bluetooth not discoverable using feather nRF52832

I just bought a feather nRF52 but I can't make the Bluetooth LE work ... I followed to tutorial (https://learn.adafruit.com/bluefruit-nr ... troduction) which features the same information that on the ...
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107 views

How to connect Arduino and Android phone using JDY-19 (BLE) module?

I am stuck with the JDY-19 BLE module. The BLE module is master and I can't find any AT commands to make it a slave. After searching I came to know that JDY-19 master and slave firmwares are different....
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24 views

Bolutek HM10-clone: CC41 state pin is blinking

Dear fellow arduino users, while working with cheap clones of the infamous HM10 (CC41, I believe), I've stumbled onto some weird behaviour: The pin "STATE", that is supposed to display the connection ...
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1answer
88 views

HM-10 doesn't responde after RENEW

Today I finally got two HM-10 modules. I did flash firmware using this tutorial. It worked until I didn't send AT+RENEW command. Now, LED blinks, I see device in BT terminal(Android phone) but I can't ...
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28 views

How do I get my servo to turn using bluetooth, is this a glitch?

I'm very new to coding with arduino so please excuse my naivety, For an electronics assignment I am making a servo turn back and forth using a HM10 BLE however each time I press a button that sends '0'...
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415 views

Arduino MKR 1010 WiFi as BLE central/client

I'm trying to use my new Arduino MKR 1010 WiFi as a Bluetooth Low Energy central/client, however I could only find information on how to use it as a peripheral/server (for example with the ArduinoBLE ...
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277 views

esp32 and the esp32-cam (agoal)

Is it considered possible to use the esp32 code on an esp32 cam board? Do they use the same hardware? I am having difficulty using this sketch https://gist.github.com/wybiral/...
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BLE splitting string data

I am working with BLE 4.2 (ESP32) that sends IMU (accel, gyro, mag) data to my mobile app (Android). Unfortunately, I can send only 20 bytes in one packet. This is the code I have: (I am connecting ...
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217 views

How do I send non-ASCII keys over the BLE HID connection using an Adafruit nRF52 Feather?

The hid_keyboard example sketch shows how to send ASCII characters, but how can I send non-ASCII codes like the F1 key, or keys with shift/control modifiers?