Programmable LED Umbrella

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Step 5: Power Supply & Arduino

The arduino requires a 5V regulated power supply.  Using a trick I learned right here on Instructables, I cracked open an old car-cigarette lighter type phone charger & pulled out the circuit board. I hooked it up to my 11.1V battery on the cigarette lighter side and the arduino on the phone side. Be sure to test the voltage output from the charger with a multimeter to make sure you're really getting about 5V, significantly more could fry your arduino.  I added a tiny Lilypad slide switch between the power supply and the battery to allow me to turn the umbrella on & off. 

I sewed a holster for the battery using old nylon strap.  Velcro allows me to open and close the holster to replace the battery.    I then zip-tied the holster to inside top of the umbrella around a rib and the main tube.

Finally, sewed the arduino and the power supply to the umbrella and hooked up all the wires. 
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