raspbian – Page 5 – Kev's Development Toolbox

May 14, 2016

In progress: Setting up an onscreen keyboard for the 7″ touchscreen on the Raspberry Pi

I just received one of these very cool 7″ touchscreens for the Raspberry Pi: https://www.raspberrypi.org/products/raspberry-pi-touch-display/

I have the default logon prompt when my Pi starts up, so first challenge is, how do you logon without a real keyboard attached, without having to disable the logon? There are a number of onscreen keyboards available – based on this thread I installed florence:

sudo apt-get install florence

and then edited /etc/lightdm/lightdm-gtk-greeter.conf adding ~a11y; for the Accessibility icon on the logon screen, and keyboard=florence so it appears in the menu.

The keyboard now appears, but as soon as I press a key it disappears. From this thread, installing at-spi2-core appears to fix the issue:

sudo apt-get install at-spi2-core

This seems to fix the keybaord not disappearing, but not having any luck getting characters to appear in the username/password fields. Still some investigation to do on this one.

May 2, 2016

Taking screenshots on Raspbian / Raspberry Pi

Install scrot (if not already installed): sudo apt-get install scrot

To pick a window, run ‘scrot -s’ and then click on the window that you want to capture. Screenshot is saved in your home dir by default.

April 30, 2016

Adding and removing cron jobs on Raspbian

crontab -l : lists current crontab

crontab -e : edits the currently scheduled jobs

You can temporarily disable a job from running just by commenting out the schedule line for the job.

April 29, 2016

Booting Raspbian Jessie to a shell prompt

Raspbian Wheezy on the Raspberry Pi used to boot to a shell by default, but on Jessie, the default is to boot in graphical mode to the desktop. You can easily change this with raspi-config, either from the desktop menu using the gui app or raspi-config from the command line. Step by step instructions in this post.