Serial communication from Matlab to Arduino and vice versa

Matlab2Arduino

1. Download the arduino file: http://adf.ly/cqoDu and load into Arduino.
2. Download the matlab m file: http://adf.ly/cqoq5 and open using matlab.
3. Ensure that arduino is connected to the PC
4. Run the matlab program.

Arduino2Matlab

1. Download the arduino file: http://adf.ly/cqp2L and load into Arduino.
2. Download the matlab m file: http://adf.ly/cqpC1 and open using matlab.
3. Ensure that arduino is connected to the PC
4. Run the matlab program.

Setup SSH to virtualbox

1. Select your vbox image that you want to add additional harddisk. Left click -> Settings -> Networking -> Change Attached adapter to Bridged Adapter
2. Launch your virtualbox system
3. Install open ssh server
4. edit /etc/network/interfaces   -> edit to static ip                                                                                  auto eth1
   iface eth1 inet static
   address 192.168.6.108
   netmask 255.255.255.0
5. /etc/init.d/networking restart  -> restart your network
6. Use software such as putty or terminal ssh <username>@192.168.6.108
7. Input your login name and password

Addding Harddisk to VirtualBox

1. Select your vbox image that you want to add additional harddisk. Left click -> Settings -> Storage -> Add Hard Disk -> Create new disk -> VDI -> Dynamically allocated -> Select location and size
2. Launch your virtualbox system
3. ls /dev/sd* (the one without numbers is the new disk)
4. su -
5. fdisk /dev/sdb (depending on where your hdd is mounted)
6. Enter c then u.
7. Enter p
8. Select your partition number
9. Enter the sectors needed
10. Enter w to write the changes
11. ls /dev/sd* ( Your new harddisk will show up with number, i.e. sda1, sdb1, etc
12. mkdir /backup
13. mkfs.ext4 -L /backup /dev/sdb1
14. mount /dev/sdb1 /backup
15. mount ( look for your new drive)
16. Add LABEL=/backup /backup ext4 defaults 1 2 to your /etc/fstab
17. Reboot
18. cd / (You should notice backup folder is created. Your new hard disk is mounted to it.
19. You can start using the new drive.

Updating fedora EOL to latest

WARNING: Do it at your own risk!

1. Edit fedora.repo to include http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/ repository.
2. Yum update.
3. Download and install the latest kernel, kernel-header,kernel-dev from rpmbone for your fedora version.
4. rpm --import the_key__version_you_intend_to_upgrade_to
5.  yum update
6. yum clean all
7. yum --releasever=version_you_intend_to_upgrade_to distro-sync

Fedora 16 -> Fedora 17

1. There are a few problems with the packages: dhclient, dhcp, etc that are not updated resulting no internet connection

Solution

1. Use live cd
2. mount chroot /mnt/sysimage /bin/bash
3. yum check all
4. manually remove and reinstall the packages that reports the error
5. yum update

Fedora 16 -> Fedora 20

 So far no problem. Data still intact except some software removed.

Logic Sniffer

Cubietruck Setup

Wifi:

1. Login to lubuntu: linaro/linaro

2. $sudo modprobe bcmdhd or add bcmdhd to /etc/modules (need to reboot)

3. Add nameserver 8.8.8.8 to /etc/resolv.conf ( without this, the system will be connected to the wifi but no internet access)

4. Reboot

Moving the rootfs to harddisk:

1. sudo su - root --> change to root user

2. mkdir /tmp/1 /tmp/target

3. mount /dev/nandb /tmp/1

4.fdisk -l -> to locate your drive, sda? sdb?

5.fdisk /dev/sda 

4. mkfs.ext4 /dev/sda1

5. mount /dev/sda1 /tmp/target

6. (cd /tmp/1; tar --backup -c *) |tar -C /tmp/target -xv

7. mount /dev/nanda /mnt/

8. vi /mnt/uEnv.txt  (Change root=/dev/sda1)

9. sync

10. unmount /mnt

11. reboot