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Seismic Sundays 0 – The Beginning
Img Credit: Wikipedia Welcome to part one of the Seismic Sundays series! For the next 3 to 6 months, I’ll be attempting to make a seismology station that sends data to a web server for anyone to see....
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Seismic Sundays 1 – Hello, World!
What you see above is the first breath of the seismometer – which is currently detecting my foot taps. A geophone by itself isn’t really all that useful. Once you apply some power, the raw signals...
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Seismic Sundays 2 – Old Haunts and Bode Plots
For the next few posts, we will be going into the nitty gritty details of the conditioning circuit. I want to spend lots of time at this stage for two reasons: Analog circuits and analysis have never...
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Seismic Sundays 3 – Debugging Woes
First, I have to admit that I messed up building the conditioning circuit. The first RC network after the first op-amp stage should have had a 6.8kΩ resistor. I accidentally used a 68kΩ resistor...
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Seismic Sundays 4 – Circuit Analysis
Analysis gone horribly wrong We’re almost done with this stage of the project! (I think…). Admittedly, this part has taken me longer than I initially anticipated, mainly because I wanted to spend a bit...
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Seismic Sundays 5 – Fail
Take a look at these two waveforms pulled from a UART line with a logic analyzer. Notice anything interesting? If you do have this figured out, then congratulations! You were able to solve this puzzle...
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Seismic Sundays 6 – We Have Data!
So between having to deal with an insane work schedule and fighting with an unruly microcontroller, I’ve managed to finally digitize the output of the seismometer: How sensitive is this geophone? To...
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Seismic Sundays 7 – Streaming!
This is it. Up until now the only people who were able to see data coming out of the seisMeowmeter was myself and anyone else I showed it to. Today, all that changes. Now you too, can see a stream of...
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