An article on the well known 555 timer and a few rather unknown applications.
A tutorial on how to add Drag and Drop functionality to a gridview control.
Build a custom gridview control for Android, programmatically.
An open source digital portable radiation dosimeter, with external connector for attaching various geiger tubes.
The SI-29BG comes with a good size / sensitivity ratio. These tubes are suitable for detecting beta and gamma radiation.
Mobile devices with embedded cameras can be used to detect x-rays.
Applications released as unlockable trial versions are vulnerable. Learn how to protect your work by embedding bulletproof security techniques.
A custom control for Android that can be used to adjust the volume and to toggle between on/off state at the same time.
A quick test with the combustible gas sensor, MQ-9B and an atmega8 microcontroller.
A simple rain sensor connected to an ATMega8, provides readings on the level of water detected on its surface.
The SI12B is a mica window compact Geiger tube, designed for measurement of alpha and soft beta-radiation.
Medium size sensitive Geiger tube for hard beta and gamma radiation.
If you’ve used Leptonica, you probably know it’s a great library, but when you want to use it to replicate Photoshop like effects, you will quickly get to want more than what the library provides by default. Take the pixGammaTRC primitive as an example: If you want to modify the lightness of your image, (making it brighter or darken it), or even a simple contrast this might work good enough….
Increasing the saturation in an image is equivalent to increasing the “amount of color”, while a completely desaturated image would be a grayscale image. See the images below: Normal Saturated Desaturated Grayscale Logic and Implementation Algorithm The images are composed of pixels. For a RGB24 image, each pixel is a set of 3 bytes, 1 for each of the three color channels: red, green, blue. 1 byte (or 8 bits)…
I met some great people today, and I also got a wonderful device for my ongoing experiments as a gift: The UT50 Scintillation probe, manufactured by SC ICPM SA Romania. It features a huge NaI(TL) crystal, with a diameter of 5.5cm and 5.5cm length. The photomultiplier is a British EMI9656KB and the entire device is encapsulated in an aluminum modular cylinder of no more than 24cm total length and 1270g…
You’ve probably seen or done lots of cool microcontroller projects already, but did you ever consider adding permanent data storage to your projects? I did, and there are numerous advantages: saving data from sensors (data logger), saving configuration files, reading external content like images or songs, and so on! One thing is to connect an SD Card to an AVR microcontroller via SPI (relatively easy), a completely different thing is…
Wireless data transfer can be useful for a variety of projects. I stumbled upon a very low cost emitter+receiver modules pair, and planned to use it for some time now. There are a few variants available on the market, but they do quite the same thing, just the operating frequency might be different (315MHz / 418MHz / 433MHz/ 915MHz): The emitter usually has 3 pins (VCC->5V, GND, DATA), with a…
Build, compile, sign and deploy applications for the Blackberry Z10, using only the command line tools.
A step by step guide on how to generate RSA keys and then use them to establish a SSH connection to a remote Blackberry Z10 device.
EDIT: there is a dedicated blog on this project, here. Make sure to follow it for latest news. A few days ago I announced my intention of creating my first crowd-funded project, but I didn’t tell you what was it about. Well, I’m planning quite a challenging project – to bring my uRADMonitor to a global scale, and create a network of distributed detectors, with data centralized on one server,…
Preparing for my first Kickstarter project . Let’s make it happen!
While working with Leptonica I had the unpleasant surprise to notice that the saturation function pixModifySaturation was not really working properly (or at least not entirely as expected). First I didn’t even know what was wrong, I just felt it didn’t look right, then I saw that by transforming the saturation in Leptonica with pixModifySaturation , the contrast would be partially lost. Debugging the issue, and using different photos for…
VA-Z431 test tube shaped geiger muller tube for liquids.
Showing how to create a cartoon effect using the image processing library Leptonica
Create a beautiful custom 3D carousel view, to give your Android user interfaces a modern look. Sample code included under GPL v2.
Learn how to create a simple tiled background for Android applications using Java code.
The Amperex 258-B is a half-wave Mercury-Vapor rectifier tube used in power supplies.
The Svetlana GP-5 (ГП-5) is a glass-envelope beam power triode intended for use as a shunt regulator or pulse modulator in high-voltage systems.
A digital counter with a nice LCD display that supports both incrementing and decrementing. Good for various purposes, in this case as a display to a coil winding machine.
A short insight on how to get started with developing for the new Blackberry 10, using dynamically created controls.