For a college project of mine, I am using an Arduino Duemilanove micro-controller to connect a bluetooth module to my Android Device Sony Xperia Tipo Dual using the app called BlueTerm. I have two bluetooth modules 1.Bluetooth Module UART, Model: RKI-1546 and 2.Model: RKI-1545.
But the problem I have is that, After I connect the micro-controller's RX to module's TX and vice versa, and send a character from my app, there is no change in the serial monitor(in the Arduino Software). I mean it doesn't display any character i had sent. However it works just fine the other way round. That is, when I type something on my serial monitor and press send, it readily appears on the mobile. I have tried 3 different RKI-1546's and a RKI-1545. I have tried using Arduino Mega(in place of Arduino Duemilanove) too. But this problem persists. The bluetooth module doesn't seem to recieve anything.
I hope if you can help me out on this.
Considering you can send data to your phone, you have set your baud rate correctly, and the pins wired correctly. Without your code I/we can't help you, so please post your code.
Thom
It is a hardware fault not software. Total error in Arduino Due.
Fix this bug:
Related
I am trying to be able to click a button on a tablet i have, and it sends a message to a master Arduino. The master Arduino then sends a message of to 4 slave devices, which switches on a relay. So far I have already been able to connect a HC-05 to an android and switch a relay on from that same Arduino but, now i need to expand it. I have about 10 HC-05 modules and i would like to use just them. Any help will be appreciated. I currently have pinched parts of the code from this website.
http://www.instructables.com/id/Remotely-Control-LED-using-HC-05-Bluetooth-Arduino/?ALLSTEPS
Thanks
Ben
I recommend looking into AT commands for the HC-05. They will allow you to set the connected device and send information to that specific device (which would permit the switching between slaves). I also go through basic switching with the HC-05, a relay, and an Arduino Uno on my blog.
https://engineersportal.com/blog/2017/11/15/bluetooth-home-automation-light-bulb-switch-using-an-hc-05-a-relay-and-arduino
I have Bluetooth SPP module SPP-C / SPP-CA , it is cheap module that should work the same way as well known HC-06 / HC-05 modules.
I have got one problem, everything works, module is communicating over serial interface pairing etc... but i can not enter the AT mode to change device name pin or baud rate. Does anyone had the same problem and how to solve it ? there is a very small data published and sellers are not responding.
So I assume that someone may help with that situation. http://www.ebay.com/itm/Bluetooth-Module-UART-Serial-Interface-SPP-CA-works-with-YZXstudio-USB-Monitors-/201414967094 that's the module. it is based on Beken BK3211 chip.
It seems that nothing special is needed to enter command mode on the SPP-CA module I have.
Whenever you connect or disconnect by bluetooth, the module will print:
CONNECTED
.. serial data is transferred ..
+DISC:SUCCESS
When the module is disconnected, you can execute AT commands such as AT+BAUD just like with HC05 modules.
3 years later and I've looked everywhere for an answer to this question and finally stumbled upon the solution by fiddling away.
I am connecting via an FTDI module using Teraterm software to enter commands.
You need to power up the FTDI and BT modules by plugging into PC USB. open Teraterm and set up to see the COM port.
Now you have to momentarily connect GND to port 11 on the BT module to 'reset' the module. The module will power down and back up again and in doing so will enter AT mode and you should be able to communicate with the module.
Good luck
Old question however still relevant, I found the solution! It is pretty simple, you can use an breadboard and some jumper wires however you can also create an adapter like I did. Like explained in this document with AT-commands, you need another UART (serial connection) to program the SPP. The SPP must not connected to anything (discovery mode) to be able to program it.
You can do this, like I did, with another SPP or you can use serial programmer or an Arduino. Notice that the serial connection is 3V, so when using an Arduino you need some resistors (1K and 2K) to create a voltage divider (google it).
The schematic is pretty simple (when not using an Arduino), I designed this adapter:
You need these components to create the adapter (and maybe some wires):
Connect everything like in the schematic above (STATE and EN are not connected), insert the modules (take care of pin orientation!), insert an USB cable and connect it to some power source.
In Arduino IDE, select the com-port you want to configure and launch the Serial monitor, you can now enter AT-commands to configure the one that is not connected:
Done! That is pretty easy right? When you want to configure the other, disconnect the one that is connect and connect the other one. An overview of AT-commands can be found in the document in provided link above.
Hopes it helps ;-)
I'm currently working on a device which is able to work as a keyboard and communicate via Serial with a self-written software.
Now I have to install serial drivers (from Arduino) on different computers if I want to communicate with my application which I actually want to avoid.
Is there any other solution to solve this problem? Is it possible that my microcontroller works as a keyboard AND is able to send and receive data as HID device?
Thanks and greetings!
I actually do something similar with a 32u4, but it receives its serial over the built-in UART. I do this because it's linking between two separate systems. If it were only one system I could implement a 2nd interface. (Don't forget, a USB HID device must have an IN endpoint even if you are not using it.) Or you could just throw a $2 USB/TTL converter on and do it the same as I did.
i use arduino mega 2560 and BT JY- MCU.
i connect to the BT with my android divece but the arduino not response unless it connect to the PC.
the code is really simple one -
maybe it becouse i use:
"char input = Serial.read();"
please help...
Please post your Arduino sketch code. The problem might be related to Serial.read(). Hard to tell without seeing some of the sketch code. One note is that a PC USB connection can force resets that might not happen running on batteries. This can be very important (and helpful).
I'm working on a little Arduino project to create a bluetooth N64 joystick for my Ubuntu box.
I managed to find a sketch to output the controllers state via serial and it works great. Also sending the TX and RX to the little CSR bluetooth module I have works fine.
When I pair with the device I have to use "rfcomm bind" to see the device in my dev directory and 'cat'ing the output shows all the data is coming through as well.
My question is this, what are my next steps for getting Linux to recognize this device as a joystick - i.e. /dev/js0. If I know what I need to do to achieve this I can read up on the necessary steps but at the moment I have absolutely no clue where to start - having not done anything like this in the past. Should I be looking into creating a Kernel Module?
Any information or pokes in the right direction at all would be greatly appreciated - even if it's just an observation.
Writing custom kernel code is definitely not the way to go here.
To make your project appear as a joystick device in Linux you'll want to present it using the Bluetooth HID profile. With that in place everything should "just work" on the client side and you'll see an entry in /dev. The HID profile is pretty comprehensive and is used by most Bluetooth interface devices - keyboards, mice, game controllers etc. the Bluetooth part of this is actually mostly just a thin wrapper around the USB HID protocol.
From the sounds of things your device is currently not advertising itself using that profile.