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Questions tagged [hc-05]

Refer to the HC-05 Bluetooth module.

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Hc 05 auto connect

I am using my hc05 to connect with a Bluetooth printer for a project. My hc 05 is in master mode since my Bluetooth printer is in default slave mode. I can configure and connect the hc05 module with ...
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0answers
16 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
14 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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18 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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0answers
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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0answers
10 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
35 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
62 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
35 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
147 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
85 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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63 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
36 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
97 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
77 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
53 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
36 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
56 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
131 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
358 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
63 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
158 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
355 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
93 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
1k 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
64 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
57 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
2k 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
668 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
610 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 ...
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1answer
238 views

Arduino 4wd rover [duplicate]

Guys i have made an arduino 4wd rover using L298N BRIDGE MODULE, HC-05 and Arduino uno but the power supply output of L298N was very low that even 1 motor is working too slow so please help me with ...
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1answer
828 views

Bluetooth a pushbutton from one arduino to another to turn on a LED

For a major project at school i need to get a bluetooth module to be able to communicate between two HC-05 modules as a master and slave. They need to be able to press a pushbutton on the slave and ...
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1answer
839 views

Unable to convert string read from bluetooth to int [closed]

I am using a HC-06 and i want to read a number ending with f as a delimiter, the first three numbers as my servo position, however converting the string into int is giving an endless series of 0s. I ...
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1answer
392 views

Can't power HC-05(5v) with Arduino Pro mini (3.3v)?

I am trying to use HC-05 (5V) with Arduino Pro Mini (3.3v) but I have had little success. I am using a coin cell to power the pro mini which powers it on and is working fine. But, my HC-05 doesn't ...
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1answer
32 views

Can you make it so, when your phone connects to the Hc-05 on a Arduino, a variable changes?

So whenever my phone gets close, and it connects to the Hc-05, the Arduino changes a variable? I want to avoid the use of apps, where the user has to do anything after first time connecting. The ...
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0answers
37 views

bluetooth module and pic

I am currently working on a project that requires bluetooth module and pic. I need to get the ID or address of the connected device.Any idea how can i do it. I only know that this is done using AT ...
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1answer
354 views

How to externally power HC-05 module with Arduino Pro Mini?

guys, I am new to arduino. I am trying to power my HC-05 (5v with regulator to 3.3v) from Arduino Pro Mini 3.3v but I can't get it to power on. There is a problem: The site I bought HC-05 from says ...
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0answers
1k views

Send Bluetooth Data to Android App (HC 05)

I'm struggling to send data strictly from my arduino UNO to an android app using bluetooth module HC 05. I am able to send/receive using 1) the serial monitor in arduino IDE and 2) Bluetooth Chat ...
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0answers
271 views

Is there a bridge needed to connect Pro Mini 3.3v to HC-05 (level 3.3v)?

I can't understand how to connect my arduino pro mini https://www.amazon.in/gp/product/B071ZCHW5P/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 To my HC-05 Bluetooth module https://www.ebay.in/itm/...
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0answers
533 views

I can't receive data from HC-05 on android

I would like to send ad8232 sensor data to android. The sensor data appears on the serial monitor however it doesn't appear in bluetooth terminal applications on android. Here's the code : #include &...
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3answers
517 views

How to use the HC-05 properly?

It all started when I was working on my Arduino project, which involves an Arduino Nano, an HC05 module and a bunch of sensors (DHT 11, soil moisture and LDR) with Blynk App. Everything worked as it ...
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1answer
69 views

Not able to control digital pins using commands sent via HC-05 module

I am trying to control the LED on pin13 using the below code but it's not working. With this code I am able to print to the Serial Monitor but the code has no effect on the any of the digital pins. I ...
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2answers
728 views

Arduino reads hc-05 device connecting status

Hello I want to get an arduino get status of bluetooth hc 05 if connect with device or not . I'm trying by myself and search on internet website but I can't find useful things.
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2answers
4k views

HC-05 Bluetooth module doesn't read data correctly from my Android phone

I have made a home automation project where am using an Arduino Uno and HC-05 Bluetooth module and an Android app. I did everything properly but when I send commands from my Android app it works ...
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1answer
99 views

A clarification needed about the HC-05

I have just got a new pair of HC-05 Bluetooth modules. I am working on a simple project. I'm trying to move two servo motors using two potentiometers. I followed a simple tutorial to move one servo, ...
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1answer
382 views

Adafruit Feather 32u4 Bluefruit LE and HC-05 Bluetooth module

Is it possible to connect an Adafruit Feather 32u4 Bluefruit LE with an HC-05 Bluetooth module? I am making a heart rate monitor using an Adafruit Feather, but it is unable to send the data to ...
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1answer
272 views

Protothread Library Stalling on One Thread

I am trying to use a protothreading library found here http://harteware.blogspot.com/2010/11/protothread-powerfull-library.html to perform protothreading with my Arduino so I can "simultaneously" ...
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1answer
111 views

Master Slave Arduino-Side Multiprocessing

I have started an Arduino robotics project with an HC-05 Bluetooth sensor to send data to my PC for processing. In my design the Arduino is to serve as the slave which gathers data from sensors and ...
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1answer
308 views

Reading/Writing Strings with Bluetooth Windows API

I am trying to use my HC05 so my Arduino can communicate with my Windows 10 PC. I have a program written using the Window API for Serial Communication but the problem is it looks like the Arduino/HC05 ...
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1answer
236 views

Connecting a servo via HC05 and HC06

I want to drive a servo via a HCO6 and HC05 link as a stand alone, using no android or PC. The question is how to send a 1.5 ms signal (generated with a pulse command on a Nano) from one HC to ...