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February 04, 2014 / by / 4 comments

Make a custom Pomodoro timer

I have recently been interested in the ATtiny85 microcontroller. Its minimalistic, yet powerful features make it a very attractive platform for simple hacks and gadgets. In addition, I had been interested in learning the technique of charlieplexing, i.e. controlling many LEDs with very few pins. The ATtiny85, with its 5 GPIO pins available by default (sacrificing ISP yields an extra pin, but I didn’t want to go down that road), seemed like the perfect candidate.

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February 13, 2013 / by / 4 comments

Real FFT Algorithms

Practical information on basic algorithms might be sometimes challenging to find. In this article, I break down two fundamental algorithms to compute the discrete Fourier transform (DFT, inverse transform is iDFT) of real-valued data using fast Fourier transform algorithm (FFT/iFFT).

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January 15, 2013 / by / 4 comments

Papercut circuit board

When designing a printed circuit board to fit in a box of a given size, there is always the fear that when the fabbed PCB arrives, it doesn’t fit.

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