Hardware Spec

Display

EA DOGM128-6 128×64 STN graphic LCD · ST7565R · SPI

Backlight

Amber 595 nm LED Würth 150080AS75000 · 0 blue light

MCU

ATmega4809 Arduino Nano Every · USB flash

Keyboard

26-key ABC silicone rubber Prototype: tac switches on perf ($13)

Power

4 × AA (proto) · 3 × AA + boost (prod) ~20–40 h alkaline · no charging needed

BOM estimate

~$11–18 at 5 000 units

Copy Mode Words

Display & Sound

Keyboard shortcuts: A–Z letters · Backspace delete · Enter action · Esc clear · Alt+1–4 mode