Adding a display to rfid time tracking

More than a year ago, I blogged here about using RFID to track presence times in the BORM ERP system. I used the system a lot since then. But the BlinkM was really limited as the only immediate feedback channel. To use it with multiple users, a display was needed. The default Arduino compatible displays […]

accelerated ray tracer

In all the great online classes I attended over the last year, there was one topic missing. Finally I found an offering for a Computer Graphics class. After all, that’s the field I ‘ve been working in for the last five and a half years. The class is offered at edx.org and is from Berkley. […]

RaspberryPi reading analog input using an AtTiny through i2c

The raspberrypi has some GPIO (General Purpose Input Output) pins. That’s great for experimenting with electronics for example sensors and actuators. It’s totally different than an Arduino in many respects, but that’s something they have in common. Some of the pins have special functions. For example SPI, I2C, UART … There is a breakboard adapter […]

Optimizing compile time of a large C++ project

The codebase of our PointLine CAD is certainly quite large. sloccount calculated roughly  770’000 lines of C++ code. I know, this is not a very good metric to describe a project, but it gives an idea. Over time the compile time steadily increased. Of course we also added a lot of new stuff to the product. […]

OpenCL First Steps

There is an increasing noise about GPGPU computing and how much faster than CPU (even parallel) it is. If you didn’t hear about all that, GPGPU is about using the computer’s graphics card(s) to do general purpose computations. The key to the performance lies in the parallel architecture of these devices. From what I read, […]