I'm a solar energy advocate, tinkerer, and enthusiast, but let's face it; solar panels are ugly!
Flat, rectangular panels can only be arranged in so many ways and always look industrial, boring, and out of place. So I decided to build a functional, but more aesthetically pleasing version of a USB solar charger.
I call my creation the "Solar Shrub". It's designed to resemble a round-leafed plant in a flower pot, but unlike a real plant, this one can charge my iPod, iPhone, and any other USB chargeable device!
I used eight 1.5 Volt round solar cells (leaves) attached to shrink-wrapped wires and clothes hangers (stems) to create an array capable of producing 5 Volts at about 300mA. I wired two sets of four cells in series (to get the voltage) and then wired the two arrays together in parallel (to get the current). I stabilized the power by building a 5 Volt Regulator circuit, then added an on/off switch, power LED, and female USB connector.
Now you can build one too! Just follow these instructions, then put it in sunlight, flip the toggle switch, and plug in your favorite USB device!
Step 1: Materials and Tools Used
Materials for Power Circuit:
1 - 7805 Voltage Regulator (Radio Shack #276-1770)
1 - Heat sink for the 7805 (Radio Shack #276-1368)
1 - Hea sink mounting hardware(Radio Shack #276-1373)
1 - Red LED(Radio Shack #276-041)
1 - SPST mini toggle switch(Radio Shack #275-0324)
1 - 22uf capacitor(Radio Shack #272-1026)
1 - .01uf capacitor(Radio Shack #272-1065)
1 - 220 ohm resistor(Radio Shack #271-1313)
1 - 4.7k ohm resistor(Radio Shack #271-1124)
1 - 3.3k ohm resistor(Radio Shack #271-1122)
1 - USB extension cable (Male to Female)
1 - Blocking Diode (1N4001)(Radio Shack #276-1101)
1 - Round Proto Board (Radio Shack #276-004)
Materials for Leaves and Stems:
8 - Round solar cells (hacked from solar garden lights) (Lowe's #379421)
8 - Wire clothes hangers
1 - Roll each of red and black 22 AWG wire (Radio Shack #278-1224)
2 - Pkgs of assorted shrink wrap (Radio Shack #278-1610)
10 - Small wire ties
1 - Can green spray paint
1 - 6" Clay Plastic Self-Watering flower pot (Lowe's #285869)
2 - Metal angle brackets
1 - CD
2 - Plastic standoffs(Radio Shack #276-1381)