Hardware
What's inside the ZerryBit, from the e-ink panel to the battery.
ZerryBit is a battery-powered e-ink display built around a low-power Wi-Fi microcontroller. It is designed to sit on a shelf or hang on a wall for months on a single charge, quietly updating itself.
This section covers the physical device. If you want to know how the software drives it, see the Firmware section.
Specifications
| Display | 7.5″ e-ink (e-paper), 800 × 480, 1-bit monochrome |
| Processor | Espressif ESP32-C6, 8 MB flash |
| Connectivity | Wi-Fi 2.4 GHz (802.11 b/g/n), WPA2/WPA3 |
| Battery | 5000 mAh lithium-polymer, rechargeable |
| Charging | USB-C, ~1 A fast charge (TI BQ24074 charger IC) |
| Controls | One rotary push-button, the Zerry button (Bourns PEC11J, 18 detents/rev) |
| Climate sensor | Bosch BME280: temperature, humidity, air pressure |
| Battery life | Roughly 3 to 6+ months depending on the update interval, see Battery & charging |
No microphone, no camera, no speaker.
The e-ink screen
Why it never glows, why it sometimes flashes, and what ghosting is.
Battery & charging
Battery life estimates, where the power actually goes, and charging.
The Zerry button
Every rotate, click, and hold gesture, including the rescue reset.
Sensors & connectivity
The climate sensor and what the Wi-Fi radio can and can't do.
PCB & pinout
Pin map, buses, partitions and eFuses, for flashing your own firmware.
Enclosure & mounts
3D-printable enclosure, wall mount, and desk stand files.
Care and operating conditions
- Indoor use. The enclosure is not weather-sealed.
- Temperature matters to e-ink: the display is happiest at normal room temperatures. In cold rooms (below ~5 °C) refreshes become slower and fainter. That is the ink physics, not a fault.
- Cleaning: wipe the screen with a dry or slightly damp soft cloth. No solvents.
- Storage: if you put the device away for a long time, charge it to about half first and power it off from Settings. Lithium batteries age fastest when stored full or empty.
- Sunlight: e-ink is perfectly readable in direct sun, but like paper, years of direct UV will slowly age the panel. A spot out of constant direct sunlight is kindest.