Last year I bought a 3D printer: Wanhao duplicator i3 v2.1. While search for solutions of common problems I’ve found some nice resources. These resources are listed below.
Sometimes when you have a large terminal command, you need to change one character in the middle. The only way to do this is hold the back arrow until you reach the character. I was wondering if it was possible to skip words just like in OSX by holding ⌥ ←
The good news is this is possible by setting your keys bindings. Open preferences, select your profile and open the keys section. Now look for the⌥ ← sequence and double click.
I am using a Macbook Pro from 2010 with an after market SSD. Everything worked great until I updated to OSX Yosemite 10.10.4. After a reboot my Macbook Pro only showed this sign:
I recently bought the Raspberry Pi 2 model B with a Western Digital Elements 1TB harddisk. When I booted the Pi, the USB harddisk makes tiny “clicks” and it seems the harddisk is not getting enough power so I needed to increase the power provided from the USB port.
The network is reached by a USB wifi dongle which also consumed some power. In order to provide enough power to the USB peripherals I bought a 2A power supply. The Pi is going to serve as a media center so I installed the OpenElec image.
I’ve started a new blog about web design and software development.
After a couple of flights with the UAir R10 quadcopter you want to record your own flights / crashes. I own a compact camera but it has a lens sticking out when turned on. A crash could easily damage the front lens so I decided to work with a more compact device: my smartphone.
I could simply mount the phone to the R10 camera mount, but this leaves the screen unprotected. Therefore I decided to make my own phone protector out of an old air mail envelope.
On the forums I’ve read a some posts about prop savers and cutting the shaft down in order to use them properly. It turned out that with my prop savers, cutting down the shaft is unnecessary. I have used one of the rings which came with the propeller.
I’ve been struggling with the battery position for a while. Today I bought some foamboard to move the battery to the top of the R10 quadcopter.
- Small piece of foamboard. At least enough to cover the battery
- 4x tie-wrap
- 1 piece of velcro
First cut out a piece of foarmboard which is slightly larger than your battery
Second cut out four small pieces of foarmboard and glue them on the “main” piece as shown. Make sure you leave enough space for the frame.
Now place the foarmboard on top of the frame as shown
Now use the tie-wraps to firmly attach the foamboard to the frame.
I have wrapped two tie-wraps through the frame holes underneath around the “main” foamboard and used two others to fixate them on the frame.
In the two pictures below you see the two tie-wraps, wrapped around the “main” foarmboard. The two others are underneath from the left to the right side of the frame.
Only using a password for ssh might make your server a target for ssh brute force password cracking. Adding two factor authentication for ssh on your Ubuntu server makes this a lot harder for potential hackers.
Google provides a tool called Google Authenticator, which is available for both Android and iOS. This tool acts as a code generator for the two factor authentication.
Every time you login via ssh, the server will prompt you for a code which you read from Google Authenticator.