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Questions tagged [hc-05]

Refer to the HC-05 Bluetooth module.

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26 views

Please help! My Bluetooth Controlled Car Isn't working

I followed this tutorial: enter link description here I built it according to the schematic except I didn't connect an LED (I assume this isn't the problem). This is the schematic: I'm a beginner so ...
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21 views

Help with turning LED on using smartphone with HC-05

I followed this tutorial: Remote Controlled LED using HC-05 I've assembled everything, uploaded the code and connected it with my phone. The code: /* Arduino Turn LED On/Off using Serial Commands ...
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9 views

communication between two HC 05 Bluetooth module

i am trying to transfer data between two HC-05 modules one is master and another is slave, slave is receiving data successfully but after sometime about 12-13 seconds it starts garbage values and ...
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3answers
23 views

Help me get my robotic car to work?

So I recently followed a tutorial on youtube and I've assembled the car and connected all the wires. What I've done: Car Now in the video, when the guy connects all the wires, the wheels constantly ...
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1answer
41 views

Connecting MPU6050 to Arduino Lilypad

To preface, I am very new to Arduino and I watched this video on YouTube. It shows how you can build a motion controlled car with Arduino and I decided to make this for my school project. One thing ...
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1answer
47 views

Audio Recording using Arduino BT module

I want to take audio signal through mic connected to Arduino and then transfer it to PC using BT module. I want to do it with BT (HC05) and Arduino Mega. I need audio packages at 44 KHz and 24-32 bits ...
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1answer
42 views

Nothing gets sent to Arduino from Processing

I have a problem where I kwow that my bluetooth module (HC-05) is connected to a processing sketch, but nothing ever gets sent from the processing sketch,why? No error messages but the info never ...
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43 views

Can HC-05 Continuously Stream data and read data at the same time?

I am trying to have my Arduino Stream an Analog Signal using Bluetooth Module (HC-05) while being able to read commands from another Micro-controller using the same Bluetooth Module. Currently, I am ...
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30 views

Are there any transmission guarantees with the HC-06's bluetooth protocol?

I'm wanting to send serial data from multiple Arduinos to a Raspberry Pi using the HC-06 module. The connection will be delivering sensor data from the Arduino to the Pi for a smart home setup and it'...
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1answer
46 views

My HC-05 Bluetooth Module is not working

I have been trying to use the HC-05 Module with my Arduino Uno to control a LED, which can be turned on and off by my phone. Everything is fine when i input the values from the serial monitor. The ...
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21 views

problem sending data from hc05 arduino to processing?

I am trying to send simple string values from my arduino to processing via bleutooth using the hc05 module. I already paired the hc05 with my computer and got its port name as shown in the image below:...
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43 views

Hardware/Software Serial communication abruptly stops (HC - 05 bluetooth module)

I'm trying to send the readings of 3 sensors simultaneously to my Android phone on an app I made using MIT App Inventor 2 via the HC-05 bluetooth module. For this, I'm sending a string like "20.067, ...
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20 views

HC-05 Bluetooth AT Mode

I know that I need to pull pin #34 high on the HC-05 "chip" (AKA PIO11) while powering ON the chip in order to put it into AT mode. Can I leave that pin high while programming, or does it need to go ...
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87 views

Garbage Characters Being Sent from HC-05

I have a contraption that uses a HC-05 Bluetooth module and sends info to a processing program which controls the contraption. The processing program is a follows (from a video by How To Mechatronics,...
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36 views

HC-05 Bluetooth module on breakout board with straight header pins

Has anyone found the HC-05 bluetooth module (on the breakout board) with straight header pins? I seem to only be able to find them with the 90 degree header pins. Removing those and soldering on ...
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0answers
18 views

Communication using two HC05 modules

I'm working on a project that consists of sending data from flex sensors from a master Arduino to a slave arduino that uses that data to control servo-motors. I am trying to start slow and just ...
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160 views

HC-05 Bluetooth fails AT+LINK

I'm trying to get a HC-05 connected as master to a Bluetooth ELM327 OBD scanner. The HC-05 is accepting AT commands, no problem. This is the sequence I use: AT+RMAAD (Clear any paired devices) AT+...
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23 views

How to connect multible arduinos with diffferent HC-05's to the same android device?

I want to create an application, in android studio, that is connected to multiple Arduino. The connection is made with Bluetooth through HC-05 modules. At the moment I'm able to connect to one, but to ...
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569 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
67 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
28 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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0answers
19 views

SoftwareSerial HC-05, ASCII “T” to turn on LED, doesn't work [duplicate]

Arduino Uno / HC-05 / ArduinoIDE App on my phone: "Bluetooth Terminal HC-05" I want the program to turn on the native 13th pin LED ON, if incoming text is "T" and turn it OFF if incoming text is "F". ...
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1answer
60 views

Using Arduino Mega with multiple HC05 Modules as masters, communicating to multiple HC05 Modules as slaves, each connected to separate Arduino

So I have not actually experimented with the HC05 Bluetooth Module yet, but I have read up about it and watched some videos. From what I understand, you cannot use one module (master) to communicate ...
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25 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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21 views

ZS-040 Bluetooth module is undiscoverable

My bluetooth module is connected to arduino nano using voltage delimiter (to get 3.3V) exactly as its said in this article. I connected it to my phone and was able to communicate with it through ...
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1answer
237 views

HC-05 with ELM327 mini OBD2 Bluetooth adapter connection problem

I am using Arduino Uno and HC05 Zs-040 Bluetooth module to establish a connection with ELM327 mini OBDII Bluetooth adaptor. I have tried more than 15 different sequences of AT commands and most of ...
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1answer
142 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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0answers
78 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
748 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
294 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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0answers
238 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
43 views

Debug-logging without using Serial.print and without WiFi

In order to transmit text from the Arduino board to the HC-05 Bluetooth module, I have use Serial.print. However, I don't see a way to debug the code without using Serial.print to test the other ...
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1answer
239 views

Arduino Power Consumption

I am pairing an Arduino Uno along with both a HC-05 bluetooth module and a sensor circuit. Show below is the circuit conditions as well as the circuit. As far as powering up the system, I am ...
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1answer
157 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
79 views

Reading values with HC-05 and sending commands at the same time working inconsistently

Not good at coding at all, so I'm at a total loss here. But I'm doing a project that involves controlling a larger DC voltage through a mosfet. What I'm doing is I'm using a HC-05 to transmit data ...
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1answer
51 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
112 views

HC-05/Arduino receiving spam data

I connected everything properly. On the first try I did receive data as I was supposed to. I then wrote some logic, re-uploaded and started receiving crazy spam. My serial monitor is getting ...
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1answer
212 views

ESP8266 + HC-05 on same arduino

I'm absolutely new to arduino, so please excuse me if this is a noob question. I want to use a ESP8266 esp-03 Wifi module with a HC-05 bluetooth module together with my arduino uno. Unfortunately ...
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1answer
716 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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0answers
81 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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4answers
191 views

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 ...
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1answer
763 views

Text send via HC-05 is broken up by first character on the receiving end?

On the receiving end, I have an mit app inventor app which acts like a client. In arduino, I check for connection status and do a serial write to send the text. The code for that is below: #include ...
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2answers
139 views

HC-05 Bluetooth module got virus [closed]

We have a problem. Our HC-05 Bluetooth module got virus. We checked it in serial monitor and found out that the output is wrong. It has a mirrored question marks(⸮)and variables(b⸮, bW⸮, k⸮, U) which ...
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1answer
2k views

L298N, HC-05 Simple Bluetooth remote car not running in Arduino

Arduino board type used in this session is Arduino Uno R3 DIP/SMD CH340 Below is the description of wiring and code in Arduino to assemble a Bluetooth RC car using android smartphone: Tested the ...
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1answer
97 views

HC-05 and p-channel mosfet

I'm trying to use a MOSFET (BS250P datasheet) to switch a circuit on and off while the MCU is asleep. It's a P-channel MOSFET that closes the circuit when the gate is pulled low. The most power hungry ...
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3answers
69 views

Bluetooth Modules not communicating correctly

I plug in BT rx to digital 11, BT tx to digital 10 and then 5v and ground from the HC-05 to the arduino. I then upload this code to the HC-05 that is set as a master. #include <SoftwareSerial.h>...
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1answer
3k views

Scan Bluetooth devices using HC-05 [closed]

Basically, I want to connect the HC-05 to a specific mobile Bluetooth(whose address is known) and when the connection is established I want to turn on a LED on the breadboard. I am totally clueless ...
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2answers
1k views

Connect one HC-05 “master” to two slaves at the same time

Does any one know what AT+CMODE=2 "slave loop" used for. As I try to connect one HC-05 master to two slaves using it, but it didn't work. i donot know if AT+cmode=2 is used for connecting to multiple ...
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0answers
756 views

Send readings to PC using HC-05

My project, briefly explained is a weather station that will send data periodically from an Arduino UNO (later an attiny85) to my PC for processing. I'm using a HC-05 bluetooth module to establish a ...