PocketMagic

Developing for Blackberry 10

A short insight on how to get started with developing for the new Blackberry 10, using dynamically created controls.

Victoreen CDV-717 Remote Gamma Survey dosimeter

The CDV-717 is a very high-range gamma radiation ionization chamber detecting instrument, manufactured by Victoreen back in 1964.

CDV-742 Dosimeter and CDV-750 Dosimeter Charger

The CDV-750-5b Dosimeter Charger is a self contained battery-operated instrument.

Repairing a Victoreen CDV-700 6B Dosimeter

Fixing a CDV700 dosimeter can be difficult because original replacement components are not an easy find.

Tube: 1B40

External Cavity tube, 1KW at 1075 to 1096MHz.

Tube: USN-5J29

5J29 is a split anode magnetron. This device is water cooled, the water flowing round the metal loop.

How to make metallic sodium

Electrolysis of molten sodium hydroxide at 318 °C .

How to scale an Android UI on multiple screens

Learn how to scale an user interface to maintain the same aspect ratio, while running the same code on various Android devices.

Atmega8 and Nokia 5110 LCD

A C++ Library for AVR microcontrollers that allows easy connectivity to the Nokia 3110/5110 graphical LCDs.

Detecting an ultrasonic beacon

How to build an ultrasound beacon and the corresponding receiver.

Virtual Reality App Controls Real household objects

You can use your smartphone (android/iphone) to control electrical equipment inside your home. See how.

Dual H-Bridge for controlling two motors

Build a dual H-bridge board to control two motors.

How to set the AVR Fusebits

Learn how to set your atmega to work with various external crystals, program the fusebits, and build a fusebit doctor to revive your AVRs, in case you wrote the wrong settings .

NMEA GPS Library for AVR Microcontrollers

An open source library that allows you to use a NMEA GPS Module with an AVR Microcontroller. UART Communication and NMEA Parser is included.

ATMega128 and HD44780 LCD using 3 Wires with the 74HC164

Learn how to transform your HD44780 LCD into a easy to use, serial LCD, that you can connect to your microcontroller using only 3 wires! It’s time to save a few pins, and expand your project’s functionality!

The Hyacinth – a timelapse video

A timelapse video of a Hyacinth opening into flower!

Microscope photos: White and Blue Mold

White and blue mold as seen under the microscope, magnified up to 1000 (one thousand) times!

Building a robot – Part 2

Building an autonomous robot using a rover platform and advanced electronics is not an easy job. Kevin asked me to build a robot that would follow its user. A companion, very much like a robo-dog. See the project log here.

uRADMonitor – Unusual Background Radiation Reports

This page has been created to report unusual activity (radiation, temperature, humidity, luminosity, barometric pressure), as recorded by the uRADMonitor, including all the debug data to support the results. I cannot guarantee the measurement precision, I merely present the data recorded by the instruments.

by Radu Motisan | January 31st, 2013 | Tags: abnormal, atypical, automated, barometric pressure, dosimeter, environmental radiation surveillance, geiger counter, geiger muller, humidity, monitoring, radiation, radiation data, radiation monitor, SBM-19, sensors, temperature, uradmonitor, weather station | Category: Electronics, Hardware, Nuclear, Research | Print This Post | Email This Post | Comments (2) | Views (1699) | Rate (15.45)

Programmatically Injecting Events on Android – Part 2

A JNI Library for Android, to inject keys and touches but also listen for incoming input events to and from all applications, available as Open Source under GPL.

Top 10 Radioactive Electronic Tubes

Some of these tubes contain small quantities of Cesium-137, Cobalt-60, Radium-226, Krypton-85. The radioactive elements have been added to increase the electronic response by improving the internal ionization processes.

Digital Soldering station ZD937

A short review on my new Christmas gift, a neat digital soldering station, ZD 937, and a quick light installation that I did with LEDS, running directly on mains , 220V, using the ZD937.

DIY/Homemade Radiation Geiger Dosimeter

A digital dosimeter design that can be used with multiple geiger tubes, constructed around the atmega8 microcontroller and a 2×16 LCD. Equipped with a radio Bluetooth module for remote operation.

BMP085 Barometric pressure sensor

The BMP085 is a compact, low power sensor for reading temperature, barometric pressure and altitude. See it in use with Atmel microprocessors.

Temperature and Humidity sensor DHT-22

DHT-22 is a small size, compact, dual temperature and humidity sensor featuring one-wire connectivity.

HC-SR04 Sonar with Atmega8 microcontroller

Build an ultrasonic sonar for non-contact distance measurements, using an Atmega8 and a HC-SR04

Statie de monitorizare a radiatiei de fond in Timisoara

Locuiesc in Timisoara, si de curand am terminat o statie de monitorizare a nivelului de radiatii de fond. Cu exceptia catorva institute din tara, care rar dau publice graficele, statia mea e probabil singura alternativa de acest gen, accesibila utilizatorului obisnuit. Acest articol, redactat in romana, prezinta detalii asupra statiei, explica ce este radiatia de fond si cum apare ea, dar si ilustreaza grafice in timp real.

uRADMonitor – Online Radiation monitoring station

I’ve developed the uRADMonitor as an Environmental Radiation Surveillance automated monitoring device. Data is gathered in real time, 24/7, and is exported via the Internet to a database online. The data is available in customizable charts for analysis.

by Radu Motisan | October 21st, 2012 | Tags: automated, barometric pressure, dosimeter, environmental radiation surveillance, geiger counter, geiger muller, humidity, microcontrollers, monitoring, radiation, radiation data, radiation monitor, SBM-19, sensors, temperature, weather station | Category: Electronics, Hardware, Nuclear, Research | Print This Post | Email This Post | Comments (53) | Views (14905) | Rate (70.31)

DIY/Homemade Geiger Muller Digital Counter V3

A story of making a DIY Digital Geiger counter circuit, that can be used with several tubes. Add an enc28j60 Ethernet module and use the data to create graphs available online!

Temperature Sensors DS18B20 and DHT11 with Atmega8

Use the Atmega8 with two temperature sensors: the DS18B20 and the DHT-11. The latter also offers relative humidity data.

Vacuum tube tesla coil (VTTC) using Russian GU-81m

Vasil sent me 3 of his complete tesla coil systems. So here I am rebuilding his GU81m VTTC.

Tube: G21-H Geiger Muller

A Geiger Muller tube for Gamma radiation.

Tube: UX-6653

A TR Switch tube used in Radar technology, manufactured by Raytheon.

Tube: EMI9524

A sensitive photomultiplier tube, used in scintillation detectors.

Tube: ZV1009

A klystron capable of up to 6000MHz

Bausch and Lomb Microscope

Read a post on my new acquisition, a Bauch&Lomb compound binocular microscope, a high quality tool, put to some good use to capture a few micro photographs. It can get up to 1000X with its current optics.

Atmega8 and enc28J60 for ethernet support

Learn how to create a network interface for your microcontroller projects. Here I have shown an example using the Atmega8 and the enc28j60 . Build a simple Webserver to show sensor data such as temperature or humidity.

Android Overlay Mouse Cursor

Learn how to create a mouse cursor in Android OS programatically, using Overlay Views.

Android default orientation and orientation change events

Find the default orientation on Android devices, and intercept orientation changes even for activities locked in portrait or landscape mode.

Bluetooth and iOS – Use Bluetooth in your iPhone apps

Learn how to use the BluetoothManager private APIs on iOS / iPhone/ iPod to discover nearby connections, populate a list view with the results, and try to establish a Bluetooth connection to the remote devices.

Developing for Apple iOS

A short guide to get started with iOS development. How to build a simple list view.

Capacitor Discharge Microspot Welder / Cutter

A DIY microspot soldering/welding/cutting device using energy stored in a very large capacitor delivered as precisely calculated pulses to working electrodes.

Mac mini is big enough to blow a full size PC away

A short review on a Mac Mini that I recently acquired. I plan to use it as my new fixed workstation instead of my older P4 PC.

Atten ADS1102CAL Oscilloscope

For my first oscilloscope, I opted for the Atten ADS1102CAL. A few months after, I could say I’m extremely happy choosing this robust device, that does an excellent job on my workbench.

Projection keyboard

The laser keyboards use laser and infra-red technology to create the virtual keyboard and to project the hologram of a keyboard on a flat surface.

Anoto Bluetooth Digital Pen on Android OS

A digital pen solution for Android OS.

USBAsp – AVR USB Programmer

A good source for cheap AVR USB Programmers. USBasp modules.

Simple Switched power Supplies

Several simple SMPS designs, constructed by Daniel, @danyk.wz.cz . A great resource to learn about various SMPS topologies.

Programmatically Injecting Events on Android – Part 1

Three possible solutions for injecting events (both keys or touch events) in Android.

Canon S2 IS CCD Repair and IR Mod

A quick CCD replacement for my Canon S2 IS camera. CCD IR filter removed to enable IR photography options.

AVR Studio 5 snprintf / vsnprintf problem with Floats

How to fix the problem with Float variables in AVR Studio

Tube: IVL1-8/13 (ИВЛ1-8/13)

The device consists of a hot cathode (filaments), anodes (phosphor) and grids encased in a glass envelope under a high vacuum condition. The cathode is made up of fine tungsten wires, coated by alkaline earth metal oxides, which emit electrons when heated by an electric current.

Tube: SBT-10A (CБT-10A)

SBT-10A, a rare geiger muller tube for professional equipment.

AVR Studio 5 C++ Support

Build C++ projects with AVR Studio 5

BlackBerry Splash Screen

A tutorial with code that presents an easy way to show a splash screen in your Blackberry application. Show the first Splash-Screen, wait a few miliseconds, than load the rest of your application.

Developing for Blackberry -part 2-

An updated article on some very basic first steps with Blackberry programming. Tools, sample app, and how to get it running.

DIY/Homemade Geiger Muller Clicker V2

This geiger counter circuit features a regulated high voltage supply, with adjustable output. It can run on a single AA battery (1.5V)

Digital Counter using CD4026

A digital counter using CD4026 for fast event counting as those from Geiger Muller tubes or scintillation probes.

Melting lead

Melting lead at 327.46 °C to recycle it as ingots.

Tube: MR-04

MR-04 is a ionization tube.

Longitudinal Excitation Nitrogen Laser

A Longitudinal Excitation Nitrogen Laser design, using a fridge pump for vacuum and N2 from air as lasing medium.

Android 4.0 (Ice Cream Sandwich) Emulator How-to

A quick guide on how to configure an Android 4.0 Emulator image.

Tube: VA-Z320

VA-Z320 mica window geiger muller tube

Tube: MCT-17/SI-3B (си-3Б)

MCT-17 Mica Window Geiger Muller Tube

Tube: SBM-19 (СБМ-19 )

SBM-19 Geiger Muller Tube

Android BluetoothClass Major Service Classes, Minor and Major Device Classes

Learn how to get over some limitations in Android Bluetooth SDK to read the Bluetooth COD (Major, minor classes) for a given Bluetooth device.

Android getSharedPreferences NullPointerException

Avoid the NullPointerException error when using the getSharedPreferences on Android.

Auto Start Android Service on Boot

Learn how to make an autostartable service on Android OS, using the BOOT_COMPLETED notification.

Building a socket for a power tube – TGI2 400/16

How to build a socket for a big Russian hydrogen Thyratron tube using copper connectors made out of a pipe.

Thyratron Switched Tesla coil (THYTC)

Using a hydrogen Thyratron tube to switch a Tesla Coil. The Thyratron tube replaces the noisy spark gap.

Relaxation oscillator using a Hydrogen Thyratron

Some details on the relaxation oscillators and my implementation using a hydrogen thyratron.

Pulse generator (Variable duration, frequency and amplitude)

A very customizable pulse generator built using three 555 timers, to control a relaxation oscillator hydrogen thyratron.

Pulse forming network

My DIY PFN for a relaxation oscillator using a hydrogen thyratron.

Twin Marx Generator

Some pictures with my marx generator throwing high voltage discharges!

Tube: TGI2 400/16 (ТГИ2-400/16), Russian hydrogen thyratron

A hydrogen thyratron is a device capable of switching big amounts of energy. The major advantage over other thyratrons is that the deionization time is reduced by using the hydrogen gas, generated in a small reservoir inside the tube, from a metallic Hydride.

Battery powered high voltage multiplier for gas igniter or stun gun

Learn how to build a compact gas igniter or stun gun, powered by a 9V battery.

Electric Fence – 20KV pulses for perimeter defense

Protect your tent’s perimeter from bears, when in the wild. A 20KV pulse generator will inflict painful shocks to anyone touching the perimeter electric fence wire. Not lethal, but very painful, enough to put unwanted visitors on the run.

Small Spark Gap Tesla coil (SGTC) #4

A small spark gap tesla coil, a good example for an relaxation oscillator.

Rewound Microwave Oven Transformer

How to rewound a MOT transformer for a high current low voltage power supply.

How to list symbols in a .so file

A simple way to extract the symbols in .so files.

Android “Unable to open sync connection” error

How to fix the Unable to open sync connection, displayed in Eclipse Console by Android SDK tools.

Wireless Power Transmitter

A wireless power transmitter used to send electrical energy without wires. It uses induction, an emitter and a receiver working on the 63.1KHz frequency.

Electronic Ballast for fluorescent lamps

A simple electronic ballast running on 220V designed to work with up to four small power fluorescent lamps

Vacuum tube tesla coil (VTTC) using Russian GI-30

A vacuum tube tesla coil built around the Russian tetrode GI-30. My first VTTC and my first vacuum tube circuit, and some very rewarding results.

Removing a stuck filter from a lens

An easy way to remove a stuck filter from a lens. All you need is a piece of flexible PVC insulated wire.

Fukushima plant time lapse video March

A timelapse video of the Geothermal power plant in Yanaizu-Nishiyama, Fukushima . Daylight time in 4 minutes.

How to give an image an old photo look

A simple way to give to an image an old photo look using actions in Photoshop

How to make a curvy selection in Photoshop

Create a proper selection using a pen tool in Photoshop

High Voltage Power supply – 140KV

A CW High voltage supply that produces up to 140000 volts (140KV) . Simple, clean design, without oil, but with high quality multipliers.

Homemade Flyback secondary -3-

Build a disc shaped flyback secondary. A robust new design, that will do a great job in your High Voltage projects.

DIY/Homemade Geiger Muller Clicker V1

An article presenting a simple DIY Geiger Muller counter using the Russian tube SI-22G and a single transistor regulated inverter that puts out 400V, as required by the tube. A very basic detector assembled in 5 minutes. See an operation comparison to the Radex RD1706.

Android overriding Menu key to disable keyboard popup

The standard functionality on Android devices makes the software keyboard popup every time the Menu is long pressed. This may be annoying or unwanted. Here’s how to disable it.

Android 9 Patch images for custom controls

Design custom shaped corners Edittexts or TextViews, or any other kind of Android interface controls, using 9 patch images that keep their aspect when stretched.

Android Contacts – a simple Contact Selector

The Android Contacts tutorial part 5, here I show a robust solution for selecting a contact from a list. A filter/search mechanism is also implemented using the SimpleCursorAdapter.

Android Contacts – Searching for contacts

Part 4 of Android Contacts tutorial presents an easy way to programatically search and retrieve a contact and all the fields we are interested in such as Phone, Email, Web, Company, Address, etc.

Android Contacts – Invoke the Edit Contact Intent

In Android Contacts tutorial part 3, I present a simple way of opening a contact in the System contact form using the ACTION_EDIT Intent .

Android Contacts – Custom Contact column to get the LOOKUPKEY

Part 2 of the Android Contacts tutorial, showing how to add a custom column to a contact, and how to use that to identify a newly added contact and read its LOOKUPKEY.

Android Contacts – Add a new Contact using ContentProvider

Part 1 of a tutorial on working with Android Contacts: add a new contact programatically, including name, email, company, phone but also a thumbnail contact image .

How to fix wash out photos from airplane

A simple way to fix the wash out photos from airplane using Photoshop.

Android WebBrowser using WebView

A few easy steps for an Internet Web Browser for Android. Learn how to use a Webview, load pages, inject Javascript, read the HTML source code and more.

Android GUI with Header+Scrollable Content+Footer

Create an Android GUI with Header, middle scrollable content, and a footer.

Thyratrons

An article on Thyratrons and a film showing three energized tubes : the 714, the 309/FG17 and the ELC1B.

Simple DIY Induction heater

A Royer oscillator with 2 IRF540 N-Channel mosfets, a 0.47uF Capacitor and a 1500uH inductor used for an induction heater. The mosfets remain cool, even with such small heatsinks.

Android PhotoPicker using Intents and Gallery

Learn how to Invoke the Android Gallery Intent to pick a photo and get the path in your application. This photo picker returns the image path directly in your application.

Android Custom Complex Listview with Header (no XML)

Create a dynamic (no XML) listview with header with all the bells and whistles. Learn how to use the item position to change its background and content for a complex result.

Android Unique Device ID

Learn to read an unique device ID from your Android phone or tablet. Use the ID to generate software security keys or for cryptography applications.

Developing for Android – the SDK – update 2011

Get started with Android Java development – a tutorial with detailed steps and lots of pictures to help you make your first android application. Use Eclipse and the Android SDK.

A Farnsworth–Hirsch Fusor failed attempt

My first attempt in building an inertial electrostatic confinement device . It didn’t work.

Android Vertical TextView / Custom Angle Text

Learn how to create a Custom TextView class that can draw vertical text or rotate the text to any given angle. Easy!

Multitester using ATMega8 and HD44780 LCD

An Atmega8 multimeter that can measure Transistors: Bipolar/Mosfet , Diodes and Double Diodes , Resistors, Capacitors: between 0.2nF to 7300μF, Triacs and Thyristors.

Ion thruster using 50KV Supply

Build a Ion Thruster using light materials and power it using a 50KV supply to see another kind of propulsion.

Homemade/DIY High voltage probe

Using a high voltage 1GOhm resistor to built a DIY high voltage probe, to measure voltages up to 55KV with a normal multimeter, by scaling the voltage down by 1/1000.

X-ray intensifying screen

Get X-ray intensifying/fluorescent screens from X-ray cassettes used for radiography.

NaI Scintillation Probe and Gamma Spectroscopy

A scintillation probe enclosing the regulated high voltage supply, the signal amplifier, the photomultiplier and the scintillation crystal (NaI). Building a DIY counter for a NaI Scintillation probe. AtMega8 and a bluetooth module for wireless data output. A cheap and easy to build homemade dosimeter with applications in spectroscopy.

High Current Invertor using ZVS

Use a ZVS Driver as an invertor for a high current supply.

We’ve got a new design!

The new PocketMagic.net logo and layout

Marx Generator 200KV discharge – artificial lightning

See a 200.000 Marx generator in action. 20cm discharges!

Android on HD2 (HTC Leo) INSTALL_FAILED_INSUFFICIENT_STORAGE

You can boot an Android image, from the SDCard of an Windows Mobile HTC HD2 Pocket PC, using Haret. Be careful to use a 2GB max SDCard!

High Voltage Power supply – 50KV

My homemade high voltage power supply that can provide aprox. 50KV for 12V in.

Android NDK Cygwin make error 127

Android NDK Cygwin make error 127, but only on some computers. I suspect there’s a conflict with other development tools (based on PATH, etc).

Android Native Play Sound using /dev/msm_pcm_out

Directly interface the PCM device, using low level native C programming. Play sounds by sending data to /dev/msm_pcm_out

Android Native Screen capture application using the Framebuffer

Learn how to do a programmatic screen capture on Android, using the framebuffer and some native C code. See how to correctly save a BMP file.

Android C native development using the NDK under Windows

Learn how to compile your C code to native Android executables, using Windows, Cygwin and the Android NDK in just 3 easy steps.

Lenovo ReadyCom5 and WLAN AP Issues

Lenovo ReadyCom 5 can cause a wireless router to self-reboot, remotely.

Reinstalling Vending.apk (Market) on Android

Learn how to reinstall the Market application on your Android, using the Vending.apk installer.

Android controlled robot (via Bluetooth) – Part 1

Learn to connect a bluetooth module to an ATMega micro controller via the UART serial interface and even further, discover it using a bluetooth enabled Android phone. The 9600bps serial link established, can than be used to exchange data: read sensors or control the robot.

High Voltage Multiplier (Half Wave Villard Cascade) 28 STAGES!

Build a Half Wave Villard Cascade of 28 Stages. That means for 10KV in you get (in theory) 280KV out! An incredible voltage, perfect for physics experiments.

Tube: EM-11 (6U5G) Magic Eye tube (tunning tube)

EM-11 is a magic eye tube, used in old radios for tunning. See some schematics on how to use this tube, for some green, fluorescent effects!

Android Dynamic (no xml) Custom Adapter Listview

A tutorial on how to build a custom adapter for an Android Listview control, and how to catch the onClick event correctly.
Includes source code.

Android NDK for Windows setup guide

See how to configure Android NDK with Windows and build your JNI project in a few easy steps.

Webcam Surveillance with motion detection algorithm

A homemade/DIY security system using a webcam, a low power server and a surveillance software.

WinCE Broadcom stack FindAttribute SDP_DISC_ATTTR_VAL 256Bytes limit

See the real limit for receiving a SDP bluetooth device attribute in the SDP_DISC_ATTTR_VAL structure for the Broadcom Bluetooth Stack.

Kvarts DRSB-01 Dosimeter

The DRSB-01 is a simple Geiger Counter device that can be used to detect normal vs. dangerous levels of ionizing radiation (gamma and beta).

Apache won’t start – Skype to blame!

Skype opens the TCP port 80 for unknown purposes. It doesn’t ask for user’s permission. This “feature” however creates problems when running legitimate software like an apache server. Think twice when installing “bells and whistles” software like Skype, Messengers, and others.

Homemade mini-itx server

See how to build a case for a mini-itx computer board. A lot of processing power in a tiny box.

Peltier thermo-electric cooler

Use a Peltier cooler and electricity of pump heat and freeze water.

WinCE Bluetooth Broadcom stack ‘Not a valid Pocket PC application’ Error

Some details on the ‘Not a valid Pocket PC application’ error resulting from calling the IsStackServerUp API in Windows Mobile Bluetooth Broadcom stack applications.

Victoreen CDV-700 6B Dosimeter Mod (Audio/BNC Connector)

The CDV700 dosimeter variant 6B (newer) and a few mods to improve functionality: audio connector and bnc connector.

Tube: SI14B Pancake Geiger Muller

A highly sensitive pancake geiger muller tube, the Russian CI14B/SI14B

Radex RD1706 dosimeter

A short review on the Radex RD1706 dosimeter, how good it is, and how can it be compared to other dosimeters, eg. the Terra-P MKS-05.

Homemade Flyback secondary -2-

Build your own indestructible flyback secondary

Resizing Linux partition results in GRUB Error 17 fix

See how to fix Grub Error 17 on Ubuntu.

Variable 0..30V 20A Regulated Power supply using LM317

A variable 0..30V power supply for max 20ampers! See how to handle all the power and build your own reliable lab power supply.

Marx generator

My first marx generator that gives 5cm sparks.
EDIT: >20cm sparks!!!

Android dynamic TAB Control

Learn to create a tab control on Android, without the XML layout. Add an image to the tab control in a few easy steps.

Linear Pseudorandom number generator (PRNG)

Understand what a random number is , how important the chaos is, and how to understand a sequence of numbers that seems to have no meaning.

Terra-P Radiation dosimeter MKS-05

The terra-p Radiation dosimeter can be used to measure Gamma, Beta and X-rays.

High Frequency Solid State Tesla Coil (HF SSTC)

My first SSTC as a high frequency solid state tesla coil.

Mains hum sensor – detect the power lines inside walls

Detect the power lines route inside walls with this simple Mains Hum sensor

CdS Photosensitive Vacuum tubes

A collection of a few NOS photosensitive vacuum tubes.

CreateProcess, GetExitCodeProcess and application crash

When using CreateProcess win32 API make sure the lpCommandLine is not a constant or your application can crash.

ATMega8 LCD Game

Create a simple game board and write a little software game for your ATMega8 LCD board.

First Atmega8 bot – (Arduino board)

An article about a differential Arduino robot by Rodrigo Nascimento Hernandez

ATmega8 and Hall Sensor A1302

Atmega8 and an A1302 Hall Sensor for sensing the magnetic fields in close proximity.

Apple iPhone 3G – introduction

This article shows a few basic things:
- How to connect your iPhone to your desktop PC and how to update the iPhone firmware
- How to downgrade the iPhone 3G from 3.1 to 3.0
- How to activate the iPhone 3G 3.0 (jailbreak)
- View iPhone filesystem in total commander
- Do screen captures of your iPhone 3G

Perseus 3 Advanced Robot (using Windows Mobile)

Perseus 3, a 4×4 advanced robot featuring an Atmega8 for sensor interfacing and motor control, and a I-mate SP5 smartphone (200MHz) running Windows Mobile 6.0 as robot’s brain. Small weight, powerful trust, and lots of features including WLAN, Bluetooth, Camera, Speaker, Phone-interface (GPRS, 3G), Microphone (for voice commands) and more.

Android tricks: Disable “No SIM card” screen

Disable the “No SIM card.” annoying Android message.

GU81M VTTC a different approach

High Voltage Power supplies

An article on various high voltage sources. Includes schematics, construction details, high resolution images and videos.

Homemade Capacitor 19nF/10KV

How to make a high voltage capacitor in a few steps. See a video with my 19nF/10kV capacitor, with under 1$ cost.

ARA – differential robot platform

A new differential robot platform, with strong gear motors and low power consumption.

Aspell word lists / dictionaries for several languages

How to extract huge word lists for most languages, using the Aspell dictionaries.

More on Android’s Bluetooth

See how to get more Bluetooth functionality on your Android device then the interface offers you. Discover nearby bluetooth devices, and see what interaction options you’ve got.

HCI Commands list

List of HCI commands.

Android adb error: “device not found” on Ubuntu

Hunting down some connectivity issues with the ADB command from the Android SDK.

Atmega8 with Bluetooth radio module

Add Bluetooth functionality to your microcontroller project (atmega8).

Write on the Android Read-only file system

Hot news: You can change the android partitions to Read-Write so you can upload new file versions (eg. permissions.xml) .

Handle drawing in Symbian

Learn how to handle drawing on the Symbian platform. A step by step guide on how to draw images and polygonal shapes.

Developing for Symbian

Make the first HelloWorld application for Symbian

Android C native development – take full control!

An useful post on how to use gcc and the android toolchain to produce native C applications for the google android.

Developing for Google Android – the SDK

Get started with Android Java development – a tutorial with detailed steps and lots of pictures to help you make your first android application.

Ultraviolet Light

Powering UV light tubes. A short comparison between UVA and UVC.

Developing for Google Android – update the OS version

A tutorial on how to unlock your Android G1, how to upgrade the ROM version and how to get Root on your embedded linux box.

Developing for Google Android – introduction

Learn:
- how to connect the Android to your Windows PC
- how to take screen captures from your Android
- how to install new software on your mobile device

Homemade Flyback secondary

An easy way to built a high performance flyback transformer. Custom and perfect to fit your needs.

Tesla Coil #3

ZVS Powered tesla coil with a nice setup on two decks

Robo Evolution – how to build a better robot

A not-so-short article on various robot platforms I’ve experimented with. See my latest designs, and learn about my findings on robotics.

A simple H-Bridge design

How to build a microcontroller to control a motor in both ways.

Win Mobile Tech Seminar in Lisbon, 11-12 March, 2009

A few words on the Windows Mobile Seminar held in Lisbon, Portugal, during 11-12 March 2009.
As a speaker at this seminar, I’ve presented a Voice Command Recognition system for Windows Mobile, in my topic named “Extending your Smartphone’s functionality”.