DIY Spare Astrolux FT03 Flashlight Driver NarsilM v1.3 UI Firmware Circuit

Specification

User interface:
    [1] By default the FT03 is set to use the very intuitive Narsil smooth RAMPING UI. Instant access to a TURBO mode is also provided.
    [2] A more conventional discrete level MODE-SET UI is available as an alternative. Any one of 12 pre- defined mode-sets can be selected.
    [3] MOMENTARY mode is useful for signaling purposes or rapidly/briefly lighting up targets.

Note:
Forbidden to use a broken skin or broken battery, which is easy to cause a short circuit.
It is recommended to use 26650 battery, the flashlight can be used to the best.