Debugging MicroPython after removing the serial connection can be tricky. In this article, we will explore how to write your MicroPython print statements to a log file on a SD card for a typical ESP…

Yarn (and npm) were getting exceptionally slow on my system. Rather than accepting the ever longer install times, I tried solving the underlying problem.

The Arduino IDE offers a useful tool that allows you to plot numbers generated by your code directly within the interface.

Map showing spread and infection rate of Coronavirus (2019)

Custom Nunjucks tag to highlight code with Highlight.js

Turning the Pi on and off is a bit of a hassle. So let's add a push button to turn it off and on.

Using the IR light source and IR filters we now have a clear separation of signal and noise from our camera. Now we can get to the task of detecting marker positions.

To get a good signal it is easiest to get rid of most if not all visible light. We'll look at IR pass filters that make our IR LED ring light stand out more from the background.

Identifying a marker in an image is done by having it reflect infrared light back to the camera. For this to work, a IR light source should be close to the camera. The most common solution is to put…

A key element to good motion capture is a high capture rate. We'll look at how we can capture high frame rates while having CPU power remaining for further processing.

There is a variant of the Raspberry Pi camera without an infrared (IR) filter. This allows imagery in low light situation and can capture images outside of the human vision. We'll take a detailed…

Python asyncio can be quite tricky to work with. We'll look at constructing a very basic pipeline to help with those IO heavy jobs.

Recently I ran into an error when restoring a Postgres database dump which was hard to pin down. The cause was a version mismatch between the pg_dump command and pg_restore command.

If you want a thumbnail generating filter in Nunjucks you'll probably run into some problems. We'll run through an async filter example. The filter will handle optional arguments and we'll look at…

A good way to get a feel for a web application is to first figure out the component hierarchy. To aid in understanding the component structure we will create a simple bookmarklet that highlights…

Having to maintain old servers serving old sites is horrible. You don’t want to take down the old site that is still drawing a few visitors but you also don’t want to cough up the server costs and…

To my knowledge there are two ways to feed a cat:

Recently I created a cat food dispenser using the Python programmable board, the WiPy. While working on that I noticed that the device requires quite some initial setup to get started. We will go…

For your users to have a degree over styling and semantic power you need some form of rich text. In certain parts of our project site we allow user Markdown input. Up till now that input was parsed…

If you are a Django web developer you surely have found the need to use the sites domain name or absolute URL in a template. Django has a lot of functions and META keywords to do just that, but the…

Sick of the bloated social media buttons? Well, you should. They are a real performance hit!