About Derek

Dr. Derek Molloy is a senior lecturer in the School of Electronic Engineering, Faculty of Engineering and Computing, Dublin City University, Ireland. He lectures at undergraduate and postgraduate levels in object-oriented programming with embedded systems, digital and analog electronics, and 3D computer graphics. His research contributions are largely in the fields of computer and machine vision, 3D graphics, embedded systems, and e-Learning. This is his personal blog site.

Linux Portscan Your Network

It can often be the case that you need to scan the network to find a particular machine that has received a different IP address under a DHCP (Dynamic Host Configuration Protocol) allocation.

The easiest way to do this under Linux is to use:

Where I am scanning in the range of DHCP allocation that I have allocated on my network. My […]

By |April 20th, 2013|Blog, General, Linux|0 Comments

Beaglebone: Embedded Linux and Stepper Motors

This video examines how we can drive stepper motors using C++ within Embedded Linux using the open source hardware EasyDriver board. The video begins by describing stepper motors and the effects of micro-stepping. It then discusses the EasyDriver Board (V4.4) and all of the available inputs and outputs. The board uses the Allegro A3967 which allows for full, half-, quarter […]

By |April 16th, 2013|Beaglebone|15 Comments

Building FFMPEG for Beaglebone from Source

For my USB Logitech C920 MPEG4 webcam I decided that I would try to build ffmpeg from source and see if it improved the streaming capability of the camera. Currently, the stream is halting after about 30 seconds and the data stream becomes frozen.

So, based on the steps at this linkĀ I downloaded the x264 source and built it. I had […]

By |April 15th, 2013|Beaglebone, Blog|9 Comments