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Questions tagged [hc-05]

Refer to the HC-05 Bluetooth module.

HC-05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup.

170 questions
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Problems connecting reliably using HC-05 (as bluetooth master)

I currently try to connect an Arduino Micro/Leonardo/32u4 to an ELM327 Bluetooth dongle using a HC-05 Bluetooth shield from iTeadStudio. I also have similar problems trying to connect to a bluetooth dongle (with added serial connection) on my…
Thomas S.
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Problem with reading data from ELM327

The idea was to create a bluetooth device on the arduino to read data from the machine (ELM327 v2.1) using the HC-05 bluetooth module. In this code the bluetooth module is switched to MASTER mode and connected to ELM327 using its MAC address. The…
gfd2
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Problems running several Arduinos off of one HC-05 Tx pin

TL;DR: Multiple Arduinos listening to a single serial rail are burning out my HC-05's TX pin. Arduinos are leaking voltage onto the signal rail. How do I stop, or isolate that to keep from burning out Bluetooth TX pin? I'm trying to build an…
Loota
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HC05 and ELM327 NODATA sending PID codes

I am working on a project where I am using an HC05 connected to an Arduino to connect to an ELM327 Bluetooth scanner. I am using the SoftwareSerial Arduino library to send and read information from and too the HC05 using the following code. However…
Fletcher Dares
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Arduino Bluetooth upload problem HC-05 v4.0

I upload code into arduino nano using a self-made PCB with bluetooth using this method. I was initially using Arduino Nano (chinese Clone, the one with CH340G) and Bluetooth module HC-05 (version 3.0) (Lets assume this bluetooth is BT1) At command…
Kunal Kataria
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Can you help me trim my code?

First of all I want to be clear, I'm not very skilled in programming methods, all the C I learned was for various Arduino projects. That being said, I just finished a project that reads some data from ELM327 via a HC-05 Bluetooth module and prints…
sundaysfantasy
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How do I connect through a HC-05 to PS4 Controller?

Searching for Arduino and PS4 on google, I find always the same construction using a USB host shield and a Bluetooth dongle. But I'd like to connect a PS4 Controller to a HC-05 device. Is it possible? If not, why not?
ndueck
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How can I connect an arduino to a raspberry pi via an HC 05 bluetooth module and transmit data?

I am currently undertaking a project where I am attempting to build a bluetooth thermometer using an arduino. I have the temperature sensor working and returning temperature readings via a usb connection to the serial monitor in the Arduino IDE…
Kyle Auterson
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How to setup HC05 Module to be distinguishable

I'm not sure if this is a dumb question, but here goes : I am developing an Android app that uses a custom Bluetooth device as a companion. I'm using an HC05 module to interface the device with my app. What I need is a way for me to distinguish my…
ShahiM
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What is a flag in programming Arduino?

I have seen many tutorials on programming an Arduino to control a HC-05 bluetooth module. In that I did not understand the term called 'flag'. What does that mean?
thunderzips
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ATtiny85 + HC-05 + Oled = smart watch

I am using an ATtiny85 for making a smart watch. Bluetooth module HC-05 with ATtiny85 pins PB3->TX, PB4->RX and it works. Secondly I have connected a 0.96" OLED on PB0 (SDA) and PB2 (SCL) and this is also working perfectly. But once I combine both…
Vipin
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Problem activating HC-05 AT command mode with Arduino Uno Bluetooth shield

Please be gentle with me. I am attempting to modify the configurations of my HC-05 bluetooth module by using the AT command set. The method by which I'm trying to do this is by implementing the following connection: HC-05 GND --> Arduino GND; HC-05…
DorkOrc
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Stepper control using Pot over bluetooth (HC-05)

I have intermediate-level Arduino experience but it's been a few years... and, I would like to be more confident in a plan before ordering all the parts. So, basically, this is theoretical. The design cannot be simulated and I have yet to do the…
T. Paul
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HC05 to HC05 Handshake Communication

I am attempting to connect an Arduino Uno to a Modern Device RBB Arduino. One is the base and the other the remote. They need to set up a simple handshake to communicate an on and off condition from the remote.The hardware and software work for both…
Alan
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How do I make the Arduino print on my Mac's Arduino IDE through Bluetooth?

This is a basic question, but I really have tried my best to find a solution on the internet to no avail. I have a fairly normal setup. HC05 module connected to an Arduino. The HC05 is also connected to my Mac's Bluetooth (fairly sure of this bc I…
iceninja21
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