Solar powered blinky

Building the Solar Flashlight Blinky
Charles Shapiro
19 Jan 2026

This is a modification of the Gamasonic solar-powered keychain
flashlight which replaces the original case and pushbutton switch with
a new case, a toggle switch, and two RGB LED blinkies. This makes it
useful as a bike or running light. After approximately a 2-hour
charge in full sun, the lights should blink for about 2 hours. They
will go at pretty much full power until the last 15 minutes or so, at
which point they'll quickly degrade to only fading red pulses.

A crate of over 500 of these flashlights turned up at my local
makerspace. None of them would light, but we soon found that the only
defect was the pushbutton. The solar cells, batteries, and LEDs all
worked fine.

Materials:

3D printed box and lid (STL s included ) I printed mine in Natural PLA
with a 0.6mm nozzle on a Prusa MK4S.

Subminiature panel mount SPDT toggle switch with 6 mm (1/4")
shaft. Adafruit sells this one ( https://www.adafruit.com/product