Concept of what the screen could look like:
Some measurements of the components
Made little shells to figure out dimensions for each component
Stacked up the shells and arranged into a single box
Dummy battery, but all parts seem to fit. The battery connector for the charge circuit will probably be removed.
It is a little big on the wrist. Should have used a smaller battery I guess.
Currently having problems with knockoff nanos talking to both the i2c screen and the accellerometer. nano appears to have some dead pins. No longer talks over usb. The programming header works fine so maybe I'll use it for the robot arm or something.
New nano with project on a breadboard again
The battery controller leaves the 5v output live when the battery is depleted. I measured it at 2.5 volts while still powering a frozen nano and active oled screen. The 3.3 volt output measured at one one hundredth of a volt so it seems it was switched off by the low battery. that makes this chip unsuitable for making usb battery packs.
3.3v does not activate the oled, but it will continue to run displaying one character at least down to 2.5v.
2 out of the 3 oled screens from ebay have broken so far. The front glass is very sensitive to pressure.