Tally

A single-button tally counter built on an Adafruit Feather RP2040 ThinkInk with its onboard e-paper (SSD1680) display. Runs on CircuitPython.

Press the button to increment a persistent count shown on the e-ink display (e.g. "days since fire alarm"). The count survives power loss by being stored in the microcontroller's non-volatile memory (NVM).

Features

• Increment — press the button to bump the counter by one.
• Lock/unlock — hold the button (~4.5s) to lock the counter (displays a lock glyph) and prevent further increments/decrements; hold again to unlock.
• Reset — hold the button for 10s to zero the counter.
• Deep sleep — after 60s of inactivity the board clears the display and enters deep sleep, waking on the next button press to save power.
• Count and lock state are written to NVM, so they persist across resets and sleep cycles.

Hardware

• Adafruit Feather RP2040 ThinkInk (250x122 SSD1680 e-paper display)
• Built-in board button (board.BUTTON)

Repo layout

• code.py — main CircuitPython application (see while True loop for the button/state machine).
• lib/ — CircuitPython libraries (adafruit_epd, adafruit_display_text, adafruit_bitmap_font, adafruit_ssd1680, adafruit_framebuf).
• fonts/ — Atkinson Hyperlegible Mono BDF fonts used for the counter and labels.
• sd/ — placeholder for SD card contents.
• boot_out.txt — CircuitPython boot banner (board/firmware info written by the device).
• settings.toml — CircuitPython settings file (empty).

Usage

Copy the contents of this repo onto a CIRCUITPY-mounted Feather RP2040 ThinkInk (code.py at the root, alongside lib/ and fonts/). The board will run code.py automatically on boot.