electronics

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hey /diy/,

for a design project me and 2 other folks are looking to make my own wearable device like fitbit, but with other sensors too (3-axis accelerometer, skin temp., ambient temp. + humidity, electrodermal activity, pulse rate, blood oximetry attachment).

I'm trying to include a bluetooth module but i'm curious how that works, does each bluetooth module come with a unique PIN that allows you to pair it with a computer?

any advice appreciated