Bought one of these Solar Skill Badges some time ago (might have been on sale) something to play with at a later date.
What could I make with this that did something and could be still used as a badge; was the question.
Ended up with something simple that amused the grandkids for a while. Solar Cell charges a 1 Farad capacitor which then discharges through 4 flashing LEDs. Takes a minute or 2 in the sun to charge to about 4.5 volts and then flashes all LEDs at reasonable brightness for about 10 to 15 minutes in the shade. The Red one stays on the longest and can tale over 30 minutes to stop flashing. The LEDs flash at 2Hz but there are slight variations that make the flashing look good. The kids found it amusing and they have an idea of what a solar cell can do. Free energy from the sun.
Project was put together pretty fast, soldering not the best. The double sided tape was to protect the circuit and little fingers. Would stick the lapel pin on the capacitor so it could be worn.
Anyway, thought I would share here.
Next project to amuse the little ones is the Glowbit Rainbow. Hoping the older one may pick up something with programming if. He states what he would like to see and we then program it and he sees it happening. .Parts currently on order.