A mobile electronic list

By martinm, in DIY and Internet of Things, november 06,2026.

Do you remember the Grocery List 2.0 - that little barcode scanner paired with a receipt printer that let you create your shopping list by scanning the items you needed to buy and then print it out right before heading out to the store? Believe it or not, 10 years later, I'm still using this system and am completely satisfied with it - well, almost...

Physical VU meter for monitoring a computer

By seb october 30,2026.

After 15 years of weekly posts, we're starting to have a hard time finding new, interesting topics. While looking for inspiration, we stumbled upon an old post from 2012 in which we'd built a physical VU meter to display CPU usage, and we figured there must be a simpler way to do it now.

How to Display a QR Code

By mvuilleu, in Programming and New stuff, october 23,2026.

QR codes are often used for advertising purposes to share website addresses on posters or flyers. They can also convey other types of information, such as Wi-Fi settings, a vCard, or a GPS location. If you can generate them dynamically, you could even create a time-limited code, or a proof-of-time stamp... and that's where it gets really interesting.

A small and very unobtrusive display

By martinm, in DIY and Programming, october 16,2026.

For an in-house project, we needed a small display that we could read from a few meters away, even in the dark, but that would remain unobtrusive when not in use. We were therefore very tempted by these displays that remain invisible when turned off, which is why we decided to use a 15x7 CharliePlex LED Matrix Display FeatherWing from Adafruit, driven by a Yocto-I2C-C, all enclosed in a 3D-printed plastic case.

Google Calendar on your Yocto-Display-ePaper-C

By seb, in DIY, october 11,2026.

Twelve years ago, we built a DIY project that displayed upcoming events from a Google Calendar on a Yocto-MaxiDisplay that was built into a kitchen cabinet. This week, we're going to update this setup so that it uses our new Yocto-Display-ePaper-C module and shows the events on an ePaper display. We'll also take this opportunity to simplify the code and get rid of the OAuth2 authentication system.