After verifying the proof of concept with stationary data acquisition jig, we are ready to move on to prototyping a portable solution. We started 3d printing enclosures for the WiFi chip ESP8266 and microphone amplifier KY038.
I have 3D modeled several versions and 3D printed to try out.
Didn't want to add too much complexity to the prototype so just used a simple top and bottom piece which clips together, while the wires will be run from the back.
Result: It gave mediocre results for sound acquisition and results were not great for converting the microphone amplifier KY038 into an EMG amplifier.

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