Arduino HC-05 (Bluetooth) Interfacing

-
In this post we will access Arduino over Bluetooth either through ur PC or Android device.
This will be useful in case when you have sensors interfaced to ur arduino board and want to send this information to ur Mobile.

Things needed to do this experiment:

1. Arduino Uno

2. HC-05


Connections:

1.Connect TX of HC-05 to TX of Arduino
2.Connect RX of HC-05 to RX of Arduino
3.Connect GND of HC-05 to GND of Arduino
4.Connect VCC of HC-05 to 5V of Arduino

Power up the device either by connecting USB or a battery.

Now you can scan this on your PC or Android device to see whether your device is listed out.

For example in Ubuntu I can run hcitool scan and it lists out all the Bluetooth devices.

Now you can see a device with name HC-05 in the list.

This means your HC-05 is working properly.

You can also check the same on your Android device.

Now you have to pair your Ubuntu Bluetooth with HC-05. In order to achieve this:

1.Go to Bluetooth Icon, and click on "Setup a New Device"

2. Click "Continue" which will search for the devices. Select HC-05.

3. Click on "PIN Options" and then Select "1234" and Click "Continue" . Now HC-05 is paired with your Ubuntu Machine.

Similarly the same thing you can do on your android device and while pairing the PIN is "1234".

Now we will make a communication in between Android and HC-05

Download Bluetooth Terminal App on your mobile:

https://play.google.com/store/apps/details?id=Qwerty.BluetoothTerminal

From the app, you can connect to the device.

Coming to Arduino: upload an empty sketch

HC-05   Arduino

RX        RX
TX        TX
VCC     5V
GND    GND

Now open the Serial Board from Arduino IDE. Now you can type from Arduino you will receive it on the Android Bluetooth Terminal screen and vice versa



Note: BAUD RATE should be set to 38400


Comments

Post a Comment

Popular posts from this blog

bb.utils.contains yocto

-
Image
bb.utils.contains  is most commonly used function in Yocto. grep in poky directory returned with 696 count. $ grep -nr 'bb.utils.contains' poky/ | wc -l 696 It's definition is present in 'poky/bitbake/lib/bb/utils.py' file This function returns third argument if the second argument is subset of the first argument else returns fourth argument Let's take an example to understand this. You can see from the above screenshot, when the second argument is a subset of first argument, "present" was returned, else "notpresent" was returned We can also use bb.utils.contains inside if loop. This we can use inside a recipe. if ${@bb.utils.contains('SOMEFLAG','NEWVALUE3','true','false',d)}; then     FOO = 'HELLO' fi
Read more

Difference between RDEPENDS and DEPENDS in Yocto

-
We normally observe these two (RDEPENDS and DEPENDS) whenever we open any recipe. What should we choose when we write our own recipe. DEPENDS -> Build Time Dependency RDEPENDS -> Run Time Dependency DEPENDS: When a recipe 'A' is DEPENDS on recipe 'B'. In this case, Bitbake first builds recipe 'B' and then recipe 'A' E.g. You need 'dbus' to be built before 'wpa_supplicant'. RDEPENDS: When a recipe 'A' is RDEPENDS on recipe 'B'. In this case, Bitbake deploys 'B' on the target system when it deploys 'A'.  E.g. 'perf' RDEPENDS on 'bash' In other words, DEPENDS are those set of packages that should be available while building package, whereas RDEPENDS are set of packages that should be available during execution of the program.
Read more

make config vs oldconfig vs defconfig vs menuconfig vs savedefconfig

-
Image
Building the Linux Kernel is a two-step process: Configuring the Kernel options Building the Kernel with those options. There are many methods available for configuring the kernel. make config: Text-based Configuration.  Options are prompted one after another. All options need to be answered Access to former options is not possible make menuconfig: Menu-driven user interface Allows to navigate forwards and backward directly between features Allows to load and save files with filenames different from ".config" Provides search feature It uses ncurses library for GUI. If the ncurses library is not installed, make menuconfig option fails. To install ncurses library on Ubuntu: sudo apt-get install libncurses5-dev make defconfig: Creates a ".config" file with default options from the ARCH supplied defconfig Configurations are generally stored in the directory: arch/$(ARCH)/configs $ ls arch/x86/configs/ i386_defconfi
Read more