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A Recycling Project with Lipos and a solarcell :)
1 x cell of an old lipo ( size doesn't matter ;) )
please forgive me for linking amazon articles ... you can ,of course order them where ever you want. Its just an suggestion and I don't make any money out of it.
How does it work ?
As long as there is enough sunlight the resistor R3 will make sure that
the transistor Q1 doesn't trigger Q2. As soon as the sun goes down the
resistance increases and Q1 triggers Q2.