Friday, 19 May 2017

BirdBox2017: something is eating my SD card

2017 is turning out to be a great bird box season for us.


Both of our Raspberry Pi camera boxes are occupied, with the first set of chicks almost ready to leave the nest.


For the last few days my only concern has been whether I'll run out of SD card space before the chicks depart.

Wednesday, 17 May 2017

Gambas Video Reverser

I recently needed to reverse a video clip, to make the action run backwards.


I couldn't find a Linux video editor with this feature built in, so I ran a series of command line instructions...


...then I decided it would be useful to wrap these instructions into a GUI application.

Friday, 12 May 2017

Looking for a Linux Video Editor?

I'm a bit of a sucker when it comes to video editors.


Although I don't do a great deal of video work (except during the bird box season) if I stumble across a video editor, I have to install it.


And so it was a couple of days ago when I discovered Shotcut.

Friday, 5 May 2017

Gambas MP4Box: a batch .h264 to .mp4 video packager

Using RaspiVid software with a RaspiCam results in a .h264 encoded video file.


Most media players require .h264 to be "packaged" into a suitable video container format like .mp4.


This very simple Gambas project uses the program MP4Box to convert or package a bunch of .h264 files into .mp4 files ready to be edited or played using popular applications.

Thursday, 4 May 2017

Replacing the DHT22 with a Bosch BME280

I compared the humidity readings from two DHT22 and was alarmed by the difference between them.


Although they are cheap, the Bosch BME280 doesn't have to cost that much more, and provides pressure measurement in addition to humidity and temperature.


Although many of the BME280s available cost around £20, I splashed out £7.61 and bagged a bargain on Amazon.

Saturday, 29 April 2017

BirdBox2017: what's happening?

Here we are, already at the end of April, but there has been plenty of action.


We have suffered technical issues, system crashes and technical incompetence.


But we have also had a lot of nest building and a fair number of eggs.

Monday, 27 March 2017

Gambas cli programming: ncurses text based user interface

Many command-line programs are more than just one liners.


They often need to display data and allow users to interface by both viewing data and making selections.


In this post I look at the Gambas component gb.ncurses and attempt to make an interactive display.

Friday, 24 March 2017

Using a Wacom tablet on Linux

The CAD boys used graphics tablets back in the days when I still worked in industry.


Using a pen with a tablet provides a very precise input method for controlling a computer application.


But are these low cost Wacom tablets any good, and do they work on a Linux computer?

Wednesday, 22 March 2017

Internet Radio example using Gambas cli

Now that I'm taking Gambas command-line programming more seriously, I thought I might rewrite the software on my internet radios.


As mentioned in a recent post, Gambas can be used to write cli programs (command-line interface) as well as the more usual gui (graphical) applications.


So this post just describes the software aspects of this project, while the other design details can be found in earlier posts.