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Răzvan T. Coloja's Blog

December 2019 Previous month
So I have this 13" Sony DPT-RP1 e-Reader that I use for reading studies and books. Some books I can't find online for free or are out of stock and I have to sometimes resort to The Internet Archive to borrow scanned copies of them in PDF format. The problem is the scans are not optimized for e-Ink screens: yellow-ish pages that appear gray-dark on the monochrome screen, text imprints from the opposite page still visible through the paper. I needed clean images to be able to read a book under nor ...
I really like the NVidia Jetson Nano. 128 CUDA cores is a lot of power for an $89 small form factor computer. Especially given what you can do with it. I've bought mine for $99 from SeeedStudio (and without advertising for them - I see the price droppeed to $89 these days). It doesn't have WiFi or an active cooler so I've also bought a b/g
WiFi module plus two antennas from AliExpress and used a 5V cooler for the huge heatsink. Got myself a metal case and started experimenting.   There ...
So I saw a video of Open LED Race in action and I liked it. Simple, enjoyable, cheap to make and something that would keep small kids entertained. I'm a Psychologist and some of my clients are less than 10 years old so in an effort to bond with them in the first meeting I needed something that would create the feeling of a mutual goal, engage them in conversation and allow me to study their determination and level of engagement in the game. Open LED Race is perfect for this.   How Open LED ...
A friend of mine is a Harry Potter fan. So when her birthday approached I've decided I'll gift her something special. I took a Raspberry Pi 3 B+, a Skywriter HAT for gesture control, an old 17” LCD monitor and some cables and set to work. There's a Linux software called "MagicMirror 2" that does all of the work so I only had to deal with the hardware for now. The screen had an 1280x1024px resolution and it came from my father's old office PC that he discarded when he retired. Since it was ...