Hydrate in style! FYI, Fiji water is a must. The shape of their bottle is ideal for the structural integrity of the clip-on glasses EEG electrode boom.

Cheap clip-on sunglasses. We only need the clip.

There pop right off. I carved off extraneous parts with a hobby knife.

Nothing like flying H20 half way around the world for no reason. There isn't anything special about Fiji water, but their bottle does seem to be a cut above the rest.

The corners of the pyramid shaped Fiji water bottle keep the plastic boom from flopping forward when the EEG electrode is pressed against your head. I did two layers of plastic just to keep my bases covered but one is probably all thats necessary.

Sewing is a hacker's secret weapon. I got in the habit of sewing with dental floss back in my train hopping crust punk days.

separating the enameled strands will make burning the enamel off a lot easier

Completely cover all the strands with flux. I have found this to be pretty crucial when it comes to getting enamel off threaded audio cable. 

now those pesky enamel laden headphone cables will be easy to connect with electrodes

These are what the EEG dry electrodes look like. Above you can see the tiny bolt I use to attach to the plastic boom.

Cover everything with epoxy for strength and water resistance.

The screw shaft on the back of the finished electrode is inserted through a hole in the bottle plastic and affixed with a nut. I punch holes near the bottom of the clip-on boom for the electrode cable - this helps keep it from moving around and getting in the way of my eyes.

This is the front view. I left the bolt long for easy access but in hypothetical 'real life' this would be trimmed.

I used these great clip on earrings I found on Amazon as the foundation for my reference electrode (link in components list). They are sturdy and compared to other ear clip electrodes, very low profile. 

As with the frontal lobe sensing electrode, I used an off the shelf EEG dried electrode for reference. I used a Dremel rotary tool with a cut-off wheel to carve out a space in the electrode for the earring + slim down the earring so I didn't have to cut out too much of the electrode.

The pre-soldered tip of the headphone cable is sandwiched between the dry EEG electrode and the clip-on earring. Silver conductive epoxy takes a while to set, especially if you don't use heat, so a clamp or vice is probably best for this.

I used silver conductive epoxy to attached the pre-soldered head phone cable, EEG electrode and earring together. Then I covered everything in regular 5-minute epoxy for strength and electrical insulation. The cable attaching the electrode to the device can comfortably sit behind my ear which keeps everything more low profile.

For little projects like this I usually just use header pins and header pin sockets for plugs. This way all those wire are out of the way while wearing the glasses but conveniently accessible when you need to program the device. The five fire are 1) V+ 2) GND 3) CLK for SWD 4) DIO for SWD 5) P25 6) P26 7) P10

I <3 flux

I always cover the base of the "plug" with epoxy, but be careful because its really easy leak excess epoxy inside which will cause a permanent jam.

The primary reason I went to the trouble of installing plugs for the electrode cables was the ability to use a variety of electrode configurations. This way in addition to EEG I can use my hacked B20 fitness tracker for a variety of ECG and EMG experiments. Making things modular is also a nice way to isolate problems and ensure that the electrodes are functioning properly. The alternate electrodes pictured above are typical ECG disposable electrodes and electrode leads soldered to male plugs from another set of headphones.

EEG Glasses are all done, now you can go check out the code examples I wrote for the device and the companion data visualization and machine learning website.