Manual Wifi setting

In order to configure wifi connection manually, type commands like these,


ip link set wlan0 up
wpa_supplicant -B -D wext -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf
iw wlan0 link
dhclient wlan0

or automate by add this to /etc/network.interfaces

allow-hotplug wlan0
auto wlan0
iface wlan0 inet manual
  wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

Console connection

Using this console cable, you can enable remote access from your laptop.
From osx, you just type as,

sudo screen /dev/cu.usbserial 115200

GPIO order is,
Green, White, Black, blank, Red.... Careful not to connect Red if power comes from another source as well.

Basic Update

After a long time we need update the modules.

sudo apt-get update -y
sudo apt-get upgrade -y

expand filesystem

Noticed I did not use full of my SD card. To extend, use raspi-config for easy configuration,

sudo raspi-config
expand_rootfs

That's it.

Another method to connect vnc

Sometimes we need to connect for vnc without display. I altered the script /etc/lightdm/lightdm.conf removing to use /etc/X11/xinit/xserverrc and set xserverrc as this,

exec Xvfb :0 -screen 0 1280x768x16


Also run the script anytime necessary.
#/bin/sh
sudo /usr/sbin/lightdm &
sudo /usr/bin/x11vnc -xkb -auth  /var/run/lightdm/root/:0 -rfbauth /etc/x11vnc.pass -forever -rfbport 5900 -o /var/log/x11vnc.log -loop

Although I don't know how it works, it does.

Edit Linux filesystem on osx

Somehow, I forgot how to edit filesystems of pi on osx. After several trials, I noticed I need to change the file of fuse-ext2. I don't know it depends on os version (10.9.2) but it worked.

to change the line

OPTIONS="auto_xattr,defer_permissions,rw+"

in

/System/Library/Filesystems/fuse-ext2.fs/fuse-ext2.util

That's it

How to copy SD card image for backup / sizeup

Just need to do as such,

sudo dd if=/dev/disk1 of=/destination.img bs=1m

change the card and then,

diskutil unmountDisk /dev/disk1
sudo dd of=/dev/disk1 if=/destination.img bs=1m