After a long hiatus, meoWS is back! There are a few projects lined up for this year which will touch on navigation and IMUs, analog electronics, clocks and perhaps some RF circuits. I hope to also work on some more projects involving software, especially iOS development so stay tuned for neat projects and potentially useful blog posts!
Today, I will show off some Christmas cards that I made for some friends. I have been experimenting with paper circuits for quite some time. My very first card consisted of a few LEDs, a microcontroller and some tracing paper to diffuse the LEDs. It didn’t do very special things other than flash pretty lights. Over time, each card had changes from the previous iterations.
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 seismic data in the Calgary area!
Here are the links:
For the Raw Output, click here
For the Frequency Domain, click here
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:
Take a look at these two waveforms pulled from a UART line with a logic analyzer. Notice anything interesting?
It has been a crazy busy week for me and my brain is temporarily shut down so there will be no updates on the seismometer today. In the meantime, enjoy the some cat gifs and we’ll see you next week.
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 of time trying to figure out what the heck was going on with the circuit (circuit analysis isn’t exactly one of my strong points…yet)
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 instead.
Because I haven’t done anything with the seismometer this week, there is no update today. Instead I will talk about things that make wavy stuff appear on something that looks like a tiny TV screen.
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 been my strong points and this is a great way to change that
- The last thing we want, is to work with erroneous data caused by poor design of the conditioning circuit
Today, we will be briefly looking at the circuit and focusing on its behaviour.