Archive for December 2012

Graphic Liquid Crystal Display (Part 1)

This series of posts will explore GLCD (Graphic Liquid Crystal Display). For demonstration purpose, I will use a standard GLCD 128×64, driven by Samsung KS KS0108B controllers: And here is its pinout Pin Diagram Symbol Level Function Vss 0V Ground Vdd +5V Power supply for logic Vo – Operating voltage for LCD (contrast adjusting) RS […]

Hack of the day

It looks like Cody Brocious, a malicious hacker managed to break the code from the door locks of most hotels which use card readers instead of plain metal keys for entering customers rooms. Apart from the fact that I will think twice before leaving any luggage in such hotel rooms, this hack raises a couple of questions […]

Fast Fourier Transform (FFT) (Part 11)

Part 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 Here is an other peak related DSP function. The purpose of this one is to get the peak information of a targeted frequency peak. It uses the same early steps as in the MajorPeak function. The filtering process includes a peak interpolation (quadratic type), and the calculated peak apex position is compared to the target […]