Android apps

[2black0]

Hi, I get issue with android apps, please check attach file

It not show what channel used, rssi is not show

[2black0]

data flow change rapidly from R>> to S<<, and bytes received is about 0 or 2

[2black0]

FYI : I use pro mini + HC05 (Baud 115200) + RX5808(V1.0) original source code (no editing)

[2black0]

and try press - / + in channel and get this

[voroshkov]

It all looks like a baud rate issue. Screenshot shows that Android app reads some trash instead of meaningful HEX values from BT. Please verify that you use:

• 5V 16MHz Arduino
• 115200 baud at BT module (e.g. try to connect to it from PC via USB-UART adapter at the specified baudrate)

[2black0]

For hc05 baudrate I can confirm 115200 (will post screenshot later)

For arduino need to be check again, okay I will report here asap after make check

[2black0]

I change promini with UNO (5v + 16Mhz), and this is screenshot of baudrate changed of hc05

[2black0]

the problem still same, android apps still not show value like before

[voroshkov]

The terminal screenshot shows that you successfully communicate with your BT module at 9600 baud (see lower right corner of the terminal window). I'm not sure why it shows 115200 as a response.

[2black0]

sorry for not info the process, I use softserial (uno) to connected with HC05,cause I dont have FTDI, but it works, If I send AT it will respond OK, so I think AT Command work normally so PC - uno 9600, and uno - hc05 38400 (default), and success change into 115200,

[voroshkov]

I see. OK. What is the code you use on Arduino to communicate with HC05?

[2black0]

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

include

SoftwareSerial mySerial(10, 11); // RX, TX

void setup() {

Serial.begin(9600);

pinMode(9,OUTPUT); digitalWrite(9,HIGH);

Serial.println("Enter AT commands:");

mySerial.begin(38400);

}

void loop()

{

if (mySerial.available())

Serial.write(mySerial.read());

if (Serial.available())

mySerial.write(Serial.read());

}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

I am following this tutorial : http://www.instructables.com/id/AT-command-mode-of-HC-05-Bluetooth-module/step4/Setting-up-connection/

[voroshkov]

OK. mySerial.begin(38400); means that BT module is connected to Arduino at 38400.

[voroshkov]

Did you enter AT+BAUD8 command in terminal?

[voroshkov]

Sorry, I've never worked with HC-05 before. It looks like in config mode it's always 38400. Take a look at this vid: https://www.youtube.com/watch?v=zoJUAjW3vQ0 It looks they enter a bit different command to set baud rate: AT+UART=115200,1,0

[2black0]

Okay thanks, will try with AT+UART=115200,1,0 Will report here asap

[voroshkov]

Well, it looks this won't work. These params control the parity and stop bits. Two zeros correspond to default Arduino UART settings. One more thing you might need is a voltage divider at RX pin of your BT module(to have 3.3V signals instead of 5V), but this seems odd, since you can successfully communicate with HC05 during setup without a voltage divider.

[2black0]

Wait I will make simple test of BT HC05 and Arduino (BT Terminal), if this is a problem maybe I need to fix it first, but If no problem I think the side of Android APPs maybe have some bug,

Oh, my test device is Xiaomi RedMi Note 4 (MIUI 8),

[nikybiasion]

I use HC-05 without issues, set to 115200 and all works great

[2black0]

@nikybiasion AT+UART=115200,1,0 right?

[nikybiasion]

i've set only AT+UART=115200, try to reset the module with AT+ORGL, set name, password and speed

[voroshkov]

@2black0 have you managed to solve the issue?

[2black0]

@voroshkov still cant solved, I am still trying with other bluetooth, maybe this one is not normal

[voroshkov]

You can try a simple test:

1. connect your HC05 to arduino:
   • GND - GND
   • 5V - VCC
   • RX - TX
   • TX - RX
2. Upload sketch:

   int cnt = 0;
   void setup() {
   Serial.begin(115200);
   }
   void loop() {
   cnt++;
   Serial.print("Counter:"); 
   Serial.println(cnt);
   delay(1000);
   }

3. Download https://play.google.com/store/apps/details?id=Qwerty.BluetoothTerminal to your phone
4. Power all up and connect from phone App to BT

If after connection you see messages "Counter: X" appearing in android app, then it's all set up correctly and there's possibly an issue with Solo Laptimer App or with hardware connections in your laptimer device.

Otherwise, try changing the baud rate in the Serial.begin(115200); line of the sketch. So you'll find out what baud rate your HC module really uses.

[2black0]

@voroshkov will try this night, will reported it back

[FredFrancisIT]

Any update on this one ?

[leveltgn]

from my youtube chanel (Spanish, sorry)

Adaptador TTL solo cuatro cables necesarios; RX, TX, +5V y GND (TX-RX cruzados) Hay que conseguir entrar en el modo AT2 (pulsar el boton al conectar al TTL y soltar) parpadeo de led 1/seg Ventana de comandos a 38400 baudios (Ambos NL & CR) Introducimos: AT+UART=115200,1,0 AT+NAME=NOMBRE el pin será 1234 Con esa configuración funcionan perfectamente Partir siempre de la configuración original