Decoding FSK transmission recorded by RTL-SDR dongle

In this article I’m about to present the process of decoding previously recorded FSK transmission with the use of Python, NumPy and SciPy. The data was gathered using SDR# software and it is stored as a wave file that contains all the IQ baseband data @ 2.4Msps The complete source code for this project is…

Complex impedance matching using scalar measurements, math and resistors

In this article I’ll present my approach to solving the problem of impedance matching using only scalar measurements, a little bit of complex numbers mathematics (in form of a python script) and resistors of different values. A worked example of 2.45GHz antenna matching to interface a 50 Ohm system is also presented to back up…

MIPI DSI Tx interface for Ipod Nano 7th gen

Before reading this post I highly recommend that you pay a visit to Mike’s Electric stuff webpage where Mike describes the reverse engineering of the Ipod Nano 6th gen LCD. It it essential to have at least some understanding of how it works since Ipod 7 LCD (IP7 for short) does it’s job in a…

Reverse Engineering Antminer S1

Antminer S1 is the 1st generation of Bitcoin mining hardware based on Bitmain Technologies chip marked as BM1380. There are 64 chips (2 boards, 32 chips each) per miner offering hash rates at around 120GH/s under normal conditions. In this article I present my approach at reverse engineering the communication protocol the chips use in…