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Project Specification — E-Ink Tamagotchi
Purpose
Battery-powered handheld virtual pet using an e-paper display for always-on, low-power visuals and physical buttons for user interaction.
Selected Architecture
- MCU: ESP32-C3-MINI-1-N4 module for SPI display control, GPIO buttons, BLE/WiFi-capable firmware development, and deep sleep.
- Display: Flux-available 1.54-inch SPI e-paper module (HTEW0154T8). A 2.13-inch exact module was not available in the library; the design uses the closest available SPI e-paper module so the schematic can be completed with a real footprint.
- Power: USB-C 5 V input, MCP73831 single-cell LiPo charger, JST-PH battery connector, AP2112K-3.3 V LDO rail for MCU/display. User prefers a larger-capacity single-cell LiPo pack; the schematic supports this electrically, and layout/enclosure should reserve battery volume.
- User input: Four tactile pushbuttons for virtual-pet controls.
- Protection/status: USB ESD protection, USB-C CC pull-downs, charger/status LED, reset/boot support passives, rail decoupling.
Assumptions
- Larger-capacity single-cell LiPo battery, nominal 3.7 V, charged from USB-C 5 V. Default charge-current programming is conservative (~100 mA) for thermal safety unless faster charging is requested.
- Compact SMD implementation unless changed later.
- E-paper refreshes are infrequent; firmware will use MCU sleep between events to conserve battery.
- The exact enclosure/form factor will be decided in layout.
Functional Blocks
- USB-C input and protection
- LiPo charge management and battery connector
- 3.3 V system regulator
- ESP32-C3 MCU module and boot/reset support
- SPI e-paper display interface
- Four-button human interface
- Status LED and test/debug access
Validation Targets
- All active components wired per datasheet-recommended circuits.
- All IC/module power pins decoupled.
- USB-C sink CC1/CC2 use 5.1 kΩ pull-downs.
- Charger programming resistor selected for a conservative charge current.
- ERC review clean before moving to layout.
Purpose
Selected Architecture
Assumptions
Functional Blocks
Validation Targets
