Dilshan R Jayakody’s Web Log

This is a simple project to demonstrate the USB custom hardware interfacing with Unity3D game engine on top of Microsoft Windows operating system(s). The custom hardware unit used in this demo is build around Microchip’s PIC18F2550 MCU. This custom USB controller consists with 4 push buttons and linear potentiometer. In supplied demo user needs to control aircraft with those buttons and potentiometer. According to the game logic 4 buttons are used to control the flying direction and flying angle of the aircraft and potentiometer is used to control the speed of the aircraft. System's host environment consists with 2 main applications such as Session Controller and Unity3D game . Session Controller is responsible for USB communication and data conversions. It’s a native application written using Delphi and it gets started with Unity game project. Communication between Session controller and Unity game project is happening through OS level shared memory location. ...

In this post we introduce brute force attacker for Sudoku puzzles. In title we say " classical " because it operates in a traditional " dictionary base " style. This terminal application is design and tested on Linux base systems and it can capable to solve any symmetrical Sudoku puzzle up to dimension of 9×9. The primary objective of this application is to get some performance readings on some x64 configurations and initial version may not support external maps. Later I extend it to support with user defined maps and now it can handle up to 9×9 data matrix with at least one known value. The attack database (dictionary) is based on text-files with sequential access controller and it helps to reduce to main "system memory" consumption. Working order of Brute Force Attacker The performance of this application is based on system architecture (especially with RAM and auxiliary storage architecture), process configuration (such as process priority, me...

Smart Audio Box (SAB) is microprocessor controlled audio switch and amplifier system, which is specifically design for audio composers and for audio engineers. SAB consist of 4 high impedance stereo inputs and two output modes. One output mode can drive stereo headphone/earphone and other output mode can drive pair of 8W speakers. In prototyping stages we identify those modes as " Personal Mode " (headphone output) and " Audience Mode " (power amplifier output). Another main feature of this system is its programmable 16 step attenuation controller. This attenuation controller helps to control the audio output level of each output-mode. Prototyping version of Smart Audio Box The main component of SAB system is ATmega8 MCU, other than that headphone amplifier is design around NJM4556 high current operational amplifier and power amplifier is based on TDA1521A. To operate, this system requires 2 power sources. Microcontroller, ADC interfaces and CMOS logic-s...