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For many years now solar garden lanterns have been sold. These small lamps feature a small solar cell, a rechargeable battery, at least one light-emitting diode and some simple control electronics. See also my post on a similar project I recently constructed: Lights for the Energy house (to be translated). A couple of years […] Continue reading Solar gold diggers? Since April this year a consortium of the Uppsala municipality, outdoor suppliers and other sponsors are trying to get Swedish people off their couches and out into the woods again. For this purpose in and around towns like Uppsala dozens of aluminum poles with a number and letter code have been placed and corresponding […] Continue reading Hunting treasure in Uppsala |
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