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Oona Räisänen (windytan)
6,009 followers -
Signals & electronics hacker.
Signals & electronics hacker.

6,009 followers
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Experimenting with ways to visualise the QRS complex in EKG over time. Here I've stacked successive waves from a single recording by triggering on the rising edge of the R wave.

Heart rate (sinus rhythm) varied quite a bit during this recording, and it can be seen that it does not affect timing during QRST.
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3/23/17
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A recommended channel for anyone who used to play with marbles as a child. Check out MarbleLympics for example. (Best if you pick a team.)

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Working LEGO Piranha Plant by JK Brickworks

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CTCSS fingerprinting: a method for transmitter identification
Identifying unknown radio transmitters by their signals is called radio fingerprinting. It is usually based on rise-time signatures, i.e. characteristic differences in how the transmitter frequency fluctuates at carrier power-up. Here, instead, I investigat...

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Redsea 0.7, a lightweight RDS decoder
I've written about redsea , my RDS decoder project, many times before. It has changed a lot lately; it even has a version number, 0.7.6 as of this writing. What follows is a summary of its current state and possible future developments. Input formats Redsea...

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Vim 8.0 released!
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