Posts tagged with beaglebone black - page 3

Remote access your BeagleBone Black using vnc

22 Feb 2015

Before going into how to share desktop with your BBB I assume you have a proper ssh access to your BBB. (through USB) (if not read this) Also this tutorial is for BBB with Debian installed (type cat /etc/*-release to know which distro you are currently using. Or refer here)

First install the vnc server in BBB.(After logging into BBB)

ssh root@192.168.7.2
apt-get install x11vnc

Then go to your local computer and open a terminal window. Install a vnc viewer like vinagre.

sudo apt-get install vinagre

Now its time to start vnc server in BBB.

x11vnc -auth /var/run/lightdm/root/:0 -forever

This will start a vnc server at port 5900. Note this server setup is temporary. If you want to remotely connect to your BBB after a reboot type the above command again.

Go to your local computer and type 

vinagre 192.168.7.2::5900



A remote desktop will be shown if all goes well. Try exploring other options in x11vnc using (in BBB)

man x11vnc

The server that's currently running will not have any password set. So if you want to set a password or want to know more about x11vnc refer here.

Note: These descriptions are for getting started with BBB. Do not run a vnc server without any password if you are planning to deploy it directly to internet.

Program BBB using C (Blink onboard LED)

21 Feb 2015
If you are familiar with linux, you may know that everything in linux is a file. You can talk to a hardware as if you are writing to a file.
There are 4 on board LEDs in BBB. You can play with that LED.

Go to /sys/class/leds/beaglebone:green:usr3/

cd /sys/class/leds/beaglebone:green:usr3/

If you write a '1' to the file corresponding to LED3, then it will light that LED. Writing '0' will switch off the LED.

echo 1 > brightness

It will switch on the LED forever. :-) If you want to switch off it again type

echo 0 > brightness

Let's do it in c.

First ssh into your BBB (refer here). Then create a directory to work with.

mkdir helloworld
cd helloworld

Open your favourite texteditor.

nano LEDBlink.c

Then type this program.


#include<stdio.h>

int main()
{
        FILE *LEDHandler=NULL;
        char *LEDPath="/sys/class/leds/beaglebone:green:usr3/brightness";
        if(LEDHandler=fopen(LEDPath,"r+")){
                fwrite("1", 1, 1,LEDHandler);
                fclose(LEDHandler);
        }
        sleep(3);
        if(LEDHandler=fopen(LEDPath,"r+")){
                fwrite("0", 1, 1,LEDHandler);
                fclose(LEDHandler);
        }

        return 0;
}
Save the program using Cntrl+O and close it using Cntrl+X.
Then compile the program using

gcc LEDBlink.c

Then run your first program.

./a.out

The program will switch on the LED for 3s and then switch off.

Getting started with BeagleBone Black (Remote login via SSH with Linux / Windows)

21 Feb 2015
Just started working with beaglebone black Rev C. As I move on with beaglebone black I will keep my blog posted. It may be helpful for newbies like me... :-)

Connect your BBB (BeagleBone Black) with your PC. Open up your terminal and type

ifconfig

to check whether it's connected. You will see an eth1 (ethx) connection with an IP assigned as 192.168.7.1

When you connect your BBB, you will see a drive mounted up (if not mount the disk). Open the drive and open start.htm. You will see documentation of the device there. You can install drivers from there. (Driver installation isn't required, but you might find a few udev rules helpful.) Just download the mkudevrule.sh file. Go to the folder where you download the file. Then give permission to execute the file.

cd ~/Downloads/
chmod +x mkudevrule.sh

Then run it by,

sudo ./mkudevrule.sh

In orded to remotly login to your BBB using ssh type

ssh root@192.168.7.2

There won't be any root password set yet. For windows users download any terminal software like putty. Then try to connect with 192.168.7.2 on port 22.