zlacker

>>headal+(OP)
We're building a neuromodulation sleep headband, and we've always had the aim of getting to the point where the user puts it on, it does it's thing (slow-wave enhancement) the person takes it off in the morning and goes about their day.

I don't even want to put IO into the device at all. Not only because it increases cost and size, but because I don't what the user having to interact. We have to find better ways to fit the device in your life, so you don't even think about it.

>>pedalp+Q61
I was working on a similar IO problem with wearables a while ago (though by the sounds of things, far less seriously than you are), and I had the idea that maybe that band/strap could function as an on-off switch, so when you undo the band (which you do when taking it off), it turns the device off, and vice versa. Could be something you could try too

>>bodge5+ad1
This is a fun material you could use to detect if a band was stretched or not, silver coated elastic [0], near 0 ohm resistance when loose, resistance increases when stretched. I built a voltage divider with a patch of it when I was experimenting with fabric input devices, mostly just noise makers, but you can see how responsive it is [1]

[0] https://lessemf.com/product/stretch-conductive-fabric/

[1] https://youtu.be/Xjo4w4OiBS8