Friday, February 26, 2021
Friday, January 22, 2021
The Raspberry Pi is a cool single-board computer, modular, onto which you can hook up web cam, loudspeakers, external hard drives, all kinds of devices.
It has wireless and bluetooth connectivity, several USB ports, an Ethernet port. It has everthing I expect from a computer.
It can play music and movies, with the new Raspberry Pi 4 and its 8 Gigabytes of RAM, I can even do real development work without any problem, with tools like PyCharm or IntelliJ.
The Raspberry Pi 400 has recently been released, this is a very cool configuration to think about. For 100.00 USD it comes with the board (4Gb of RAM), a keyboard and a mouse. "All" you need to add is one (or two) HDMI screen(s).
A desktop HDMI screen can be an expensive device...
Along the same lines, below are a couple of configs I came up with before the Raspberry Pi 400 was released..., keeping in mind that those configs are mobile configs, not desktop ones.
The different configurations presented here can be acheived for less than 150.00 USD. And they do work for real.
Note: The configurations presented below have small screens... But nothing is preventing you to plug in a big one.
Here are several configurations for a small Raspberry Pi based laptop, to be taken on the go.
Click on the pictures to enlarge them.
In its Pelican box, with a 7" touchscreen (no keyboard needed, it's like a tablet). The Raspberry Pi is behind the screen, ducked in the foam.
With a wood and plexiglass custom case, a breadboard, wireless keyboard with touchpad, and a 7" HDMI screen
|Same config, but without the holder, in a Pelican case||It all fits in|
|Putting things to work||At work!|
|In the box, closed.||Connecting the loudspeakers|
With an Adafruit 3.5" TFT, as explained here: here):
And there is a Raspbian OS 64-bit version in preview... I'm looking forward to the 16Gb version of the Raspberry Pi 4!
Sunday, November 29, 2020
Definitely something to check out: Twister OS.
It runs on pretty much any Raspberry Pi 4, it comes loaded with tons of cool apps, and it possibly looks like a Mac Desktop 😀.
I'll look deeper into it, but it sounds already promising!
Thursday, November 26, 2020
I was gradle'ng on the Raspberry Pi Zero as usual, and during a build, I had the following message:
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Friday, November 20, 2020
The full project is here, with the STL and OpenSCAD files for 3D printing, and the list of parts.
It comes with screen, keyboard, touchpad, speakers, camera, USB ports...
It plays movies, music, fully featured!! And for less than $100.
Friday, May 29, 2020
(See the Raspberry Pi blog).
And it comes along with a beta-64 bit OS, named Raspi OS, that targets Raspberry Pis 3 and higher.
I tried it (on a Raspberry Pi 4, with 4 Gb of RAM), it works fine, and fast!
This beta version does not come with Java installed, but a simple sudo apt-get install default-jdk installs it (JDK 11) in a couple of minutes.
I cloned a repo (https://github.com/OlivierLD/raspberry-coffee.git) and built it without any problem or error.
Now, I might wait a bit longer to get a new Raspberry Pi. As it is now, it should be able to support 16 Gb of RM, I'll wait a bit, and see...
Anyway, that makes yet another good reason NOT to get a Mac.
Steve Jobs vs Eben Upton..., I vote for Eben Upton, biiiiiig time.
Friday, May 22, 2020
- We start from the colored image
- We turn it to gray
- We thresh it
- We resize it (smaller)
- We store it in a file, custom format
- We can then display the image on the led matrix (oled screen here)
// threshold Mat threshed = new Mat(); Imgproc.threshold(gray, threshed, 150, // 127, 255, 0);Tweaking the
150above) leads to different results.
The final result is stored in a binary file (
The matrix used here is 128x64 pixels big. The file will contain 64 lines of 2
longhas 64 bits, 2
longs make 128 bits, that's all we need to encode one line of 128 leds on the screen.
See the code in