Pencil sketch of the device as I'm describing it in the post.

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   blinry (blinry@chaos.social)'s status on Friday, 28-Feb-2025 21:18:20 JST blinry

   Here's how I'm envisioning the entire device:

   The battery will be at the bottom of the back side, with the ESP32 and CO2 sensor above it.

   The e-ink screen connects to the center of the front side. Three buttons at the top can be used for interaction, the two at the back are for flashing. USB-C port at the side.