Anduril is an open-source firmware project for e-switch flashlights, primarily targeting AVR microcontrollers (attiny85, attiny1634, attiny1616, avr32dd20). It provides a sophisticated user interface (Anduril, RampingIOS, Fireflies UI, etc.) built on the SpaghettiMonster event-driven state machine framework. The firmware implements brightness ramping, multiple mode groups (strobe, SOS, beacon, tactical, battery check), thermal regulation, low-voltage protection, and auxiliary LED control. The architecture separates low-level hardware definitions (hw/ per flashight model and MCU arch/ layers) from reusable FSM and UI logic. Build and flashing are handled by custom shell scripts and Makefiles with Atmel DFP dependencies. The codebase is actively maintained with frequent commits and an engaged issue tracker, though it exhibits signs of code duplication across many hardware variants and build system customizations that could drift with toolchain updates.