Components:

• 2x 2x5mm screws
• 1x 2.5x20mm screw
• 1x 12x12x3mm button with cap
• ESP-01s + WLED firmware
• Charger (TC4056A) + DC-DC boost controller
• Custom board with soldered AMS1117-3.3v (ESP power and connections board. I cut from prototype board)
• 3x15cm LED strip (WS2812b)
• 1x 21700 or 18650 battery
• Soldering iron + straight hands ^_^

WLED tuning:

Add presets ("API Command"):

• "`T=2`" - Power switch
• "`P1=1&P2=31&PL=~-`" - Previous preset
• "`P1=1&P2=31&PL=~`" - Next preset Note: P1 - First preset, P2 - last (Count of presets). Go to Config - Time&Macros - Button actions And set this 3 presets to any button actions you like.

In "segments" - add 3 segments, 9 leds per segment. "Reverse direction" for 2nd segment (Or 1 and 3) for better animations.

WARNING: ====================

1. On full bright - LEDs can generate too much heat, possible to deform holder. Use ABS plastic or reduce brightness.
2. DC-DC converter based on TP4056A chip. This chip does not have uder-voltage protection, so possible to damage battery (voltage drop upto 2.7v - then ESP may glitch and/or you can see some light glitches)

TODO: Replace DC-DC to more reliable and functional module.