Questions tagged [bluetooth]

Bluetooth enables short-range wireless communication between devices.

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Help with Bluetooth shield

Hey guys I have this Bluetooth shield Does anybody know how I can get it to connect to Arduino? I can't find any guides on it. I have this serial program that I want to use to turn on a led. but ...
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83 views

HC-02 Bluetooth module not visible

I am trying to connect to my robot car with the HC-02 module. The problem is that the module is visible on my phone only while the arduino uno board is connected to my laptop. At this point I can pair ...
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1k views

Change the mac address on an HC-05

So I tried to save a little money and bought (5) HC-05 bluetooth modules off of our good buddy eBay. When the modules arrived, as I was testing and setting up for my project (2 nano's connected via ...
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1answer
100 views

HC-05 connecting to Arduino

I have been looking through StackExchange, and searching on the web and cannot find an answer to my issue. Setup: Arduino Nano 168 HC-05 VERSION:3.0-20170601 I am trying to connect my Android phone ...
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1answer
38 views

Using an Android bluetooth terminal to change preset states on 8x8 LED matrixes

I'm trying to create eyes for a project, and while I have been able to properly program the different expressions, and have them triggered by commands from the COM3 terminal, I have not been able to ...
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33 views

BLUETOOTH MODULES Arduino

I am new to the world of electronics so please forgive me if I ask stupid questions. I would like to ask if there is a difference between Bluetooth Modules that state: "for Arduino" as well as those ...
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1answer
1k views

ESP32 bluetooth discovery parse names

I'm running a sample code from ESP32 examples and I'm scanning available BLE devices. I can see device MAC address etc. But for few devices I can't see their names.I am using ESP-WROOM-32 with ...
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1answer
165 views

Adafruit Feather 32u4 BLE compatible with Software SPI?

Let me preface by saying that I am not super experienced with electronics. I have an Adafruit Feather 32u4 that is using Hardware SPI to communicate over Bluetooth. Unfortunately, I'm also hoping to ...
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57 views

Joystick Bluetooth to Bluetooth to Motors [UPDATED] [duplicate]

I have updated the code, switching the Bluetooth sensors because my codes were switched(master was slave, and slave was master), putting the hc05s on the same baud rate, and removed certain comments, ...
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14 views

Bluetooth not Transmitting over HC05 Master Slave Setup [duplicate]

I am trying to control a robot, where I have one HC05 module as a master connected to an Arduino Uno with an attached joystick. This Arduino sends data signals that will run blocks of code on the ...
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73 views

Arduino Bluetooth to Control Joystick Issue

I am trying to control a robot, where I have one HC05 module as a master connected to an Arduino Uno with an attached joystick. This Arduino sends data signals that will run blocks of code on the ...
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0answers
205 views

How can I send AT commands to HM-10 module from my android phone?

Earlier today, I was able to connect flawlessly to my HM-10 module via the Arduino serial monitor. I think I then changed some settings without thinking and now I can no longer connect to it. No ...
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3answers
705 views

Unable to store data in variable from Serial.read()

I have a relay and bluetooth module connected to Arduino Uno. I send data such as digit 1 to the bluetooth module and I view it in the Serial Monitor. If I send 1 from serial monitor I get 4910 ...
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357 views

Bluetooth gamepad via Adafruit Feather M0 Bluefruit BLE

I'm trying to build a Bluetooth-enabled gamepad out of an old Playstation 1 controller, using an Adafruit Feather M0 Bluefruit BLE. I've programmed the board as a Keyboard HID and everything works: ...
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1answer
41 views

Where can I find the source codes for the various classes and methods used in Arduino Primo?

I am new to Arduino development. I am trying to connect a BLE device (Arduino Primo) with my iOS app. From the Arduino BLE examples, I understand how to initialize the BLEperipheral class and then ...
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1answer
75 views

Looking for a cheap small arduino ish board [closed]

I'm looking for a cheap and small bluetooth board for a project. I found this one, but I find this one too expensive, are there cheaper alternatives, in similar size? Thank you!
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1answer
35 views

Need help combining two sketches (HC05 and temperature) [duplicate]

I have a project where I have to combine 4 sensors and get data wireless via Bluetooth (HC05). I just want help with combining just 1 sensor sketch and the Bluetooth sketch. I want the data from the ...
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1k views

Help with sending data to MIT app inventor through bluetooth

I'm trying to connect my arduino bluetooth sensor to an MIT App Inventor app I made, and in doing so display the readings of two of my sensors. Whenever I test the sensors in the serial monitor, I get ...
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1answer
226 views

HC-05 bluetooth module

I was able to connect my HC-05, pair it with my phone, and I can see data in the Serial Bluetooth Terminal Android App. But when I try to connect it to a certain application it says it cannot find it....
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2answers
400 views

Is it possible to connect miband2 and arduino nano (?)

I want to make an IOT project using an Arduino nano and I need heart rate sensors. I I have a miband2. So, is it possible to connect them ?
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1answer
379 views

Can an Arduino (Leonardo) be recognized via Bluetooth as a mouse/keyboard?

I'm new to wireless communication on Arduinos and doing research for a project. I'm looking at the Arduino Leonardo (which is like the Uno) which via its micro USB port can be automatically recognized ...
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0answers
84 views

Can I configure pairing for HC-05 and Arduino, and use the HC-05 without Arduino after?

I have a system that is outputting data via its serial, and I need to relay that data to my PC wireless-ly. If I were to setup an Arduino and HC-05 at the system's side to relay the data, that would ...
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1answer
1k views

Transmit/Receive data Nodemcu(V3) + Bluetooth Module HC-05

I am trying to communicate with the HC-05 Bluetooth module for quite long time now, but with no success. I am using the Nodemcu(V3) ESP8266 module. I connect the HC-05 to Nodemcu in following ...
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1answer
520 views

Does baud rate for HC-05 Bluetooth module need to match the Serial Monitor?

I have this sketch that I got as a sample. I have the two HC-05s connected. What I type in one serial monitor shows up on the other, but as question marks. The most common reason for this I find is ...
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1answer
130 views

Replace mechanical switch with electrical switch or relay

I have a remote controller for a portable heater, and working on a small project to be able to control the fan on/off from an arduino with Bluetooh HM-10 module. I thought a solenoid might work by ...
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0answers
59 views

How to remove or only show part of the data received?

I'm using the ble_client.ino example and I can't figure out how to only show some of the notifyCallback data. I'm getting three different types of data from one service UUID. static void ...
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0answers
332 views

HC-05 sending data to Android a value but it cracked out of its form

I am totally beginner but I am trying to finish my project as school work :-( but from the beginning, I am really stuck. Could anyone help me out? #include <SoftwareSerial.h> SoftwareSerial ...
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1answer
2k views

Badly formatted characters using JDY-30 bluetooth module

I have a JDY-30 bluetooth module and have it wired like this (except using an Arduino Uno): It is working, but I need to use it with a 115200 baud rate instead of the default one of 9600. I also got ...
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1answer
269 views

Serial.write printing blank values

I've got an Adafruit Bluefruit NRF52 hooked up to the Adafruit BNO055 9-axis orientation sensor, but when I use Serial.write to send the data, serial monitor displays blank values only. The scroll bar ...
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1answer
260 views

RN4678 Bluetooth doesn't respond

I am facing very basic level issue with RN4678. I purchased a module from https://www.mikroe.com/rn4678-click I want to simply communicate with it through serial port. To do that I connected it to ...
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0answers
24 views

Checking/accessing Serial prevents clean upload of sketch via bluetooth?

I'm deploying some DIY home automation devices, built around a 3.3v pro mini, a HC-10 module, and a relay board. The arduino is able to be programmed over the bluetooth module, so once it's in the ...
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1answer
652 views

How to send big data (long string) from PC to Arduino using Bluetooth

One of the requirements of my projects is to send data from my application to the Arduino robot. I have windows 10, and my robot is Arduino Uno. The Bluetooth I'm using on my robot is HC-06. The app ...
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1answer
98 views

Digital Input using a button doesn't work properly when using it to control a relay

I'm trying to control a relay both via Bluetooth and using a switch. The problem is that, when the LED is off, I can turn it on with the switch but then if I turn off the switch the relay will stay on....
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2answers
374 views

Distance measuring utilizing (1 or 2) Arduino Nano's

I would like to develop a small-distance measuring device that will be primarily used in indoor scenarios to measure a distance with cm accuracy (mm if possible). The device would be in a small form ...
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1answer
59 views

Is it possible to combine a HC-05 Bluetooth module and a shrinked arduino ATtiny45/85 to control a motor, LEDs, or other components? [closed]

I'm thinking of making a tiny RC toy project that is controlled through Bluetooth with most components at its tiniest size. I'm a complete beginner in this area so i'm not completely familiar with ...
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0answers
228 views

Convert normal keyboard into Bluetooth Keyboard

I am very new to the Arduino world, I am trying to convert my wired keyboard into a bluetooth keyboard. I have a few layman questions: Is it possible to add an audio jack adapter(like PS4 joystick ...
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1answer
285 views

mySerial.available() is returning 0

I am using bluetooth hc-05, arduino uno and ap app created by mit app inventor.The problem is myserial.available is returning 0 and hence its loop is not getting executed. I had connected four pins of ...
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1answer
189 views

Connect a button to bluetooth board and comunicate with Android

I want to create a small device, just a button that sends its status to an Android application through Bluetooth. I bought a Bluno Beetle, but the information it exposes to Bluetooth cannot be ...
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1answer
142 views

NRF51822 ± Arduino Uno / ATmegaXXX?

Hello I want to make a simple home automation project and I'd like to use an arduino uno for prototyping and later a atmega for deployment. I need some sort of a mesh communication method. I was ...
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1answer
157 views

Can I make the BT module disconnect with a BT module and connect with another in the code?

I am working on a project that requires a connection between two BT modules (HC-05) and a mobile phone. Later on, I encountered a problem: I can't connect two BT modules to one at the same time, So I ...
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1answer
73 views

Sketch talks to Android via BLE on Serial2 but times out after 5 seconds when Serial cable disconnected or not present

From an Android phone I am using the "Serial Bluetooth Terminal" app to communicate to an Arduino Mega 2560 with a Bluetooth Low Energy HM10 (Jaycar XC-4382) module connected via Serial2. If the ...
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3answers
1k views

I can send on software serial, but not read?

I've been cracking my head over this for a long while. Like many before me, I'm trying to send and receive data from a HM-10 bluetooth module, arduino mega adk and the app called BLE Scanner. I've ...
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0answers
258 views

SerialBT.begin(“name”) now causes brownout in ESP32

I'm attempting to run the example sketch SerialToSerialBT.ino. It's a pretty commonly used sketch. I successfully loaded it on one of my ESP32 chips last week, and was able to use a tablet serial ...
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0answers
585 views

Is there a module that will allow me to pair a bluetooth keyboard to an arduino?

I want to pair a bluetooth keyboard to an arduino project, so that pressing a key on the keyboard causes an action to happen on the Arduino. Let's say that pressing Q on the keyboard makes an LED turn ...
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2answers
400 views

Arduino - expression cannot be use as function :( [closed]

Sketch: //XPERT MIND. //This program is used to control a robot using a app that communicates with Arduino through a bluetooth module. //Error Code Chart: Code 01; Turnradius is higher than Speed; ...
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2answers
1k views

Bluetooth OBD2 ELM327 connectivity issues

I made a little project using an Arduino UNO, a 3.5" display, a HC-05 bluetooth module and an ELM327 (cheap ebay clone). I managed to establish communication, read the data, interpret and display it, ...
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1answer
487 views

Problem Uploading to the Arduino Nano board [duplicate]

]2I am using an Arduino Nano board. It has an ATmega 328P processor. For running the codes I use Arduino 1.8.6 Software. The issue is that when I am uploading my sketch to the board it shows me the ...
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1answer
140 views

Is two modules using Serial Interface on one Arduino Uno possible?

I was wondering if I have both a Bluetooth HC-05 module and a GPS module (uBlox 7N) is it possible both for both to be using the serial interface? I'm aware they cant be operating simultaneously ...
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0answers
88 views

HC-05 and cheap Nano clone not powering on

I have a HC-05 module which works absolutely fine with an Arduino Uno. Because I need to reduce the size of it, I tried using an Arduino Nano. After correctly wiring it up to the Nano, sometimes the ...
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2answers
214 views

Two HC05 Bluetooth Bind problem

I succeeded in giving an AT command. My two BL MAC addresses are 21, 13, A03B and 21, 13, A3E2. When I want to connect one to the other I use AT+BIND=21,13,A3E2. But then I see Error(7). If I use ...

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