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. 
<p>I should have said '... am having difficulty ....'</p>
<p>Nice project!</p><p>Can you advise me?</p><p>I'm planning to build something using MAX7219s but am difficulty understanding the theory behind the calculation of Rset. I assume Rset sets the forward voltage and current through the LED array. Assume that Vf = 2.0 V and If = 20 mA, then then RSet must drop 3 V (if Vcc = 5 V) @ 20 mA = 150 ohms. But the table on Page 11 of the MAX7219 datasheet says that RSet in this case is 28k ohms.A huge difference I don't understand!</p><p>Any help most welcome. </p>
im not really sure if it is posible to do a matriz of stripes, https://www.sparkfun.com/products/11750, and it also can help to make it waterproof with the right enclosure for the components
also, athough I know it would help, I do not know anything about electronics. Is this project something someone who has zero knowledge of electronics should be able to attempt? or should I save my money and not bother ordering the parts?
This is great! I walk stilts for a living and need a lite up umbrella for my costume.! I would buy yours if it were for sale haha. Thanks for posting.
Great Instructable. I know you posted this sometime ago but did you write any sketches for the mic input.
This reminds me of the luminescent umbrellas in the movie &quot;Blade Runner.&quot;
I saw an item on thinkgeek.com that was a replica of the ones from Blade Runner.
That's just a visual joy! And yes, shades of BladeRunner... I'd like to see one of those umbrellas reproduced actually...
Like it! very good idea
Nice one, maybe you should really think about making it somehow waterproof then. Would help seeing ppl during rainy days/night better. BTW: regarding the LED driver two comments: You mentioned that you would like to add local, or at least string dimming. I know two parts, one is similar to the MAXIM which can do this: AS1115-18 (Here you can do the dimming per string) <a href="http://www.austriamicrosystems.com/eng/Products/Lighting-Management/LED-Driver-ICs/AS1116 ">http://www.austriamicrosystems.com/eng/Products/Lighting-Management/LED-Driver-ICs/AS1116 </a><br> AS1119 (This one can do 8bit PWM per LED and drives up to 144LEDs, but it is completely different from programming.)&nbsp;<a href="http://www.austriamicrosystems.com/eng/Products/Lighting-Management/LED-Driver-ICs/AS1119">http://www.austriamicrosystems.com/eng/Products/Lighting-Management/LED-Driver-ICs/AS1119</a><br> BTW: For MAX7219 there is cheaper 1:1 drop in called AS1106 or AS1107 from austriamicrosystems too. And for free samples two sources always come handy :)
Great suggestions, Forcebringer, I'm definitely going to check those out.
you should of mounted the LEDs on the underside of the umbrella so it wud be waterproofed. Great instructable though!! :)
Can you actually use this in the rain?
No, it would probably not react well to water. Its really non-functional as far as traditional umbrella uses, i.e., keeping out rain or sun.
love this! but it's way beyond my skill set! lol Nice job.

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