Dilshan R Jayakody’s Web Log

LEDShoot is a simple electronic shooting game which we developed in a year end vacation period. This is a single player electronic game with following game play logic: There are two fighting groups are exists in this game world. RED group is an enemy group and GREEN s are friendly parties. Player’s job is to shoot the RED group(s) when they appear on the stage. Player gets limited time to shoot and misfires are treated as negative points. When player get 100 points game get end with winning message. This electronic game system is mainly based on ATmega32 MCU and firmware is developed using GCC C (with Atmel Studio 6.0). This system is design to work with 5V - 1.5A power supply unit. We developed this system as a hobby project and we construct it on a couple of breadboards, at the moment we don’t have any PCB design for this project. When assembling the circuit make sure to use some heavy-duty push button for ( SL2 ) control key. For ( SL1 ) use 8 Ω - 1W (60mm) sp...

PalindromicGen is a lightweight configurable tool to perform reverse-and-add operations to obtain Palindromic numbers . The main purpose of this application is to examine the existence of Lychrel numbers in a series of natural numbers. Sample execution of PalindromicGen from 10 to 1000 base numbers This tool is developed using Free Pascal compiler and its design to work with many platforms with minor adjustments. We test this tool in several Windows and Linux distributions. PalindromicGen is design to work with Pentium 4 (or compatible) instruction sets (under the default compiler configuration) and its performance is heavily depends on its settings and system configuration. Under the theoretical limits this application can manipulate up to 2 31 digit numbers and at the development phase we test this system with maximum of 501 digits (to obtain the palindromic number of 1186060307891929990 ). PalindromicGen is an open source software project and it is release un...

This is a "quick design" to make surround sound dock for Apple iPod, iPhone and iPad devices. This audio docking module contains analog surround sound processor, bass booster and electronic mode switch. Main components of this surround sound dock are LA2610 - analog surround sound processor and ATTiny13 - 8bit MCU. This unit is design to work with 9V external DC power supply and it can deliver maximum of 2 × 1W audio output power. Printed Circuit Board Design of Surround Sound Dock In prototyping stage we test this system with couple of Apple iPod and iPad devices with 4inch full range 8Ω speakers. This system can also drive professional headphone through its " Ext. Output " connector. This system need 160mm × 100mm double side PCB and it is specifically design for vertical docking chassis. This project is an open source hardware project and its design and other related materials are distributed under the terms of Creative Commons - Attribution...

These days many verities of alarm systems are available in the market. Some of them get triggered through touch and some type where a wire needs to broken to get triggered.  Both of these types of alarms have some limitations and problems. Wire based alarms are easily avoidable, noticeable and need some regular maintenance. Touch type alarms often pickup RF waves and get activated (because of that it need some controlled environment to function properly). In this project we design and develop LASER based burglar alarm system. Instead of wire(s) this system use LASER light wave and it can effective for more than 50m. Core features of this alarm system are: High audio output power (Max. 3W PMPO) Master light override switch Inbuilt alarm test functionality Memorized power state Quick response time (aprox. 10ms ~ 30ms) Support for wide input voltage range (15V – 25V DC) Easy to build and calibrate Compact size (aprox. 130 × 200 × 60mm) This alarm system is specifically ...

Project Profile Post ( 3P ) is an open source XML base project description suite. It it helps authors to provide project descriptions and specifications to online sources in a standard way. 3P project description system is not limited for software projects, it can also applicable for any online project work which include electronic projects, arts, multimedia content, etc. 3PEd - Cross platform tool to edit 3P files 3P files can created through 3PEd . It is a GUI application and available for both Windows and Linux operating systems. 3P files can be open (view) through " 3P Viewer ". 3P Viewer is a GUI application and it is also available for both  Windows and Linux operating systems. Initially we create this file format and tools to manage our in-house digital contents and later we plan to release it to general public as a free and open source software product(s). 3P tools are available to download at 3P project page at sourceforge.net and it is distribute under ...

Last weekend I got chance to visit to Aptinex (Pvt.) Ltd.  Aptinex is a Sri Lankan startup company and they are mainly do Electronic circuit designing, PCB prototyping, mass-production of PCBs, selling electronic components, development kits, etc. In my last visit I order some dsPICs , Atmel ATmega MCUs and some SMD passive parts from them. They have good collection of development kits and programmers which include Arduino , MSP430 base kits, ARM development boards, Altera FPGA kits, etc. Another interesting thing they have is electro-mechanical parts. They have various kinds of actuator modules, servo mechanisms, gear systems and controllers. I think this is good news to Sri Lankan DIY electronic community, because right now it is bit difficult to get these items in local electronic shops. According to Aptinex, Lankatronics.com is there market place. Lankatronics.com operates in both real and virtual nature. Anyone can order Aptinex products through this site and they...

This is a high voltage, low current, offline, AC adjustable power supply for electronic/electrical experiments. This power supply is mainly design for switch mode power supply (SMPS) experiments and to drive basic high voltage electrical circuits. Thanks to the isolated step-up transformer this power supply breaks the ground loop and provides shock free – safer high voltage output. This offline (or isolation) feature preventing accidental current from reaching ground through a person's body. This unit generates 50Hz or 60Hz (selectable at runtime) square wave AC output, and it is capable of generating output voltage between 150V – 290V AC (on no-load state). Prototype version of offline high voltage AC power supply As stated above this power supply unit is mainly design for SMPS experiments. This is not work well with liner power supplies because transformers in linear power supplies are get overheating from square wave inputs generated through this unit. This is a hig...