Author Archives: batchloaf

To list timezones: To set timezone to Europe/Dublin:

100 Hz sampling using Timer 1 interrupt 100 Hz sampling with moving average

The Arduino IDE requires access to the serial port (/dev/ttyUSB0 on my machine) to upload a sketch to the Arduino. In a Debian Live session, the default user (“user”) doesn’t have permission to access the serial port. Possible solutions include: … Continue reading →

Install VirtualBox Note: To get VirtualBox working on my machine, I had to disable “secure boot” in the machine’s BIOS settings so that the vboxdrv kernel module could be loaded. The vboxdrv module appears to be unsigned. Go to this … Continue reading →

In this plot, four cycles of PRBS-15 are shown. Like all PRBS sequences generated using a linear feedback shift register (LFSR), this binary sequence is periodic with a period of 32767 bits. The colour of each point on the path … Continue reading →

Having just watched two great Numberphile videos with Matt Henderson (1, 2), I was inspired to try visualising a PRBS in the style of turtle graphics. Below is my first quick experiment. The sequence used in this example is the … Continue reading →

I downloaded the BtbN Windows build of ffmpeg from here: https://github.com/BtbN/FFmpeg-Builds/releases The specific file I downloaded was: ffmpeg-n4.4.1-2-gcc33e73618-win64-gpl-4.4.zip (download) I extracted the zip file, then opened a command window in the “bin” folder where ffmpeg.exe was located and took a … Continue reading →

One of my students is building an Arduino-based robotic system that needs to run a program on the PC to do some image capture. The Python script below bridges the gap. It opens a serial port (you need to specify … Continue reading →

NB This post is a work in progress. Download example files: example_question.zip This post documents the process I used to programmatically generate multiple variations on a quiz question for the Brightspace virtual learning environment. The quiz question displays an example … Continue reading →

First, install gpsbabel and (optionally) gpxviewer. Now, use gpsbabel to combine the two .fit files into a single .gpx file. gpxviewer can be used to check the merged activity on a map. The merged activity file can now be uploaded … Continue reading →