Lighting up a school bag to make the child more visible in the dark.
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The quickest, and probably sufficient option would be to buy reflective labels and stick these to the back of the school bag. That would be it.
Let's put a little more work into this.
By using a 32x8 flexible LED matrix, we can make a kid really stand out from the dark crowd. I'll base myself on one of my previous projects (Light my cargo bike) for controlling the LEDs.
A €2.99 power bank from the Action shop is a great way to get cheap 18650 cells.
These cells are probably from Tianshi. No datasheet available.
Adafruit has a very good guide with examples.
64x32 flexible LED matrix (or Adafruit 3826): much more graphical possibilities (see Adafruit website). But likely consumes too much power and might be fragile as well.
Christoph Tack
Toby Jackson
Dave's Dev Lab
Iván Alfredo Cabrera
Jan Mrázek