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Experimenting with Vibration Sensors Challenge Summary It has been another fun challenge.  I was not able to achieve what I had proposed (TinyML model to identify people by their footstep vibrations), but as always I learned a lot working on the project.  And I've developed some hardware and software tools that will be valuable for future projects.   The Kemet/Tokin VS-BV203 Piezo Vibration Sensor is ultra compact (8.4 x 11.4 x 2.9 mm) and the 3 meter miniature flexible cable mak ...
I did not obtain sufficient data (both in quality and quantity) to construct an impulse (model), but I thought it would be worthwhile to review what I was trying to achieve by comparison to an impulse that I have successfully deployed using Edge Impulse.   I created and deployed a keyword spotting impulse on an Arduino Nano 33 BLE Sense board that detects the words "On" and "Off".  I demonstrated that impulse in a previous post: Wio Terminal Sensor Fusion - TinyML Keyword Spotting Part ...
I started collecting data for my project, but I strained my back (doing something else) and I don't think I'll be doing much more project stuff for a while.   I did capture a bunch of data and I thought I'd evaluate that, even though I don't think it will be sufficient to develop a TinyML model.   Dataset overview First, let me go over the methodology that I used to determine the dataset parameters and experimental procedure.   My objective is to be able to recognize a person by ...
Time to work on uploading data to Edge Impulse ...   Here is a view of my project on my Edge Impulse dashboard:   There are a few different methods for acquiring the data needed to train the model (impulse).  Using the Edge Impulse CLI, you can stream data from your device using the Data forwarder or upload data files using the Uploader.  You can also send data files to the Ingestion service https://docs.edgeimpulse.com/reference  using HTTP/HTTPS.   Here are the c ...
I've been working on a program that would allow me to quickly capture and label data to upload to Edge Impulse.   Data capture program requirements Fixed sample size Fixed sample rate Selectable data labels Incrementable file name Save to SD card    To make things easy, I'm not going to allow user entered parameters because I don't have a keyboard.  And I'm not going to get fancy and implement a GUI or pulldown selections (save that for another project ).  Because a ...
As I've described in earlier posts, I'm trying to see if I can use the sensor to pick up footstep vibration patterns to identify who is in the room.  With a single sensor this can't work for multiple people simultaneously, but hopefully it will work for a single person.   I've been researching the topic and I found an interesting article: Person Identification using Seismic Signals generated from Footfalls .  This is the pre-publication article as I don't have access to the publis ...
Sensor hookup I've been reading with interest all the clever solutions to interfacing the tiny connector on the end of the vibration sensor cable.  I had also ordered the recommended SMD mating connectors.  When I received the connectors, I pretty much decided that I couldn't easily make a robust adapter so I was just going to cut the existing connector off and attach a larger Grove connector because I have lots of cables and boards that use the Grove system.  I've recently been u ...
ralphjy

Vibration Sensor Setup

Posted by ralphjy Top Member Nov 26, 2020
I received the vibration sensor and the MCU boards for the challenge and I am starting to evaluate an appropriate method of sensor attachment for my experiments.   The included instruction manual from Tokin has quite a bit more detail than the Kemet datasheet that is linked from Element14.   The sensor housing is quite small (8.4 x 11.4 x 2.9 mm).  It comes attached to a 3 m shielded cable that is about 2 mm in diameter and is terminated in a tiny SHR-03V-S-B female connecto ...
Introduction I'm a retired EE with 40+ years of experience primarily in semiconductor test equipment design both in hardware and software.  When I was a graduate student working at the University of Hawaii we used seismograph readings to alert us to earthquake activity to correlate to a tsunami early warning system that we were proposing.  So, I've been interested in vibration sensors for a while .   When I saw the Experimenting with Vibration Sensors Challenge it reminded me of ...