Ben Jabituya was looking at commercial products for sleep monitoring using EEG, and thought to take a look at more DIY based approaches using some open source sensor boards and a basic microcontroller.
I had a Feather M0 Adalogger around from a previous project so decided to go with that. By all accounts the ATSAMD21 chip has a decent ADC and the SD card meant I can record and process data between the board and my PC easily. It’s also pretty small and has a connector for a battery so can be built into a wearable pretty easily.
The code used on the Feather and a Python script to generate a spectrogram from the raw data files is on GitHub.
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