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Uber nerd alert. Help needed.
Le Chuck:
--- Quote from: Samstag on March 28, 2012, 01:39:43 pm ---
--- Quote from: Le Chuck on March 28, 2012, 12:55:23 pm ---Radioshack. Seriously, walk in and say, "I need everything to power 7 LEDs from some AAs... Including the LEDs". 10 minutes and $25 bucks later you'll be homeward bound.
--- End quote ---
Where do you live that the RS employees would know what you're talking about? I haven't been to one like that in decades. In my experience the only question they can answer now is "can you sell me a cell phone?"
--- End quote ---
Deep south. Bad luck for you. RS around here seems to pride itself on having a guy on deck that knows his way round the parts drawers. They even have a project wall where they'll post picks of projects with RS parts if you bring it in for them.
Mike, best thing to do first then would be hit up the instructables for wiring LEDs off AA batteries and get a parts list. RS will have all the parts.
HaRuMaN:
--- Quote from: Le Chuck on March 28, 2012, 01:46:22 pm ---
--- Quote from: Samstag on March 28, 2012, 01:39:43 pm ---
--- Quote from: Le Chuck on March 28, 2012, 12:55:23 pm ---Radioshack. Seriously, walk in and say, "I need everything to power 7 LEDs from some AAs... Including the LEDs". 10 minutes and $25 bucks later you'll be homeward bound.
--- End quote ---
Where do you live that the RS employees would know what you're talking about? I haven't been to one like that in decades. In my experience the only question they can answer now is "can you sell me a cell phone?"
--- End quote ---
Deep south. Bad luck for you. RS around here seems to pride itself on having a guy on deck that knows his way round the parts drawers. They even have a project wall where they'll post picks of projects with RS parts if you bring it in for them.
Mike, best thing to do first then would be hit up the instructables for wiring LEDs off AA batteries and get a parts list. RS will have all the parts.
--- End quote ---
Yeah, when I walk into Radio Shack (which I try to avoid like the plague) and get asked "Can I help you?" my reply is "Prolly not...".
Bootay:
+1 Haruman same here.
Le Chuck:
Try this: (If one of the great gods of wiring wants to jump in with a more betterer solution please feel free)
This is in parrallel rather than in series which has the advantage of using a smaller power supply and it's easier to make them light individually by assigning a single LED contact to each fingertip (one will have to double up). I also went the 6 and not 7 since the 7th infinity gem isn't cannon.
1 x 6 array
+----|>|---/\/\/----+ R = 150 ohms
+----|>|---/\/\/----+ R = 150 ohms
{6v} +----|>|---/\/\/----+ R = 150 ohms
+----|>|---/\/\/----+ R = 150 ohms
+----|>|---/\/\/----+ R = 150 ohms
+----|>|---/\/\/----+ R = 150 ohms
each 150 ohm resistor dissipates 60 mW
¼W resistors should be fine for this application
together, all resistors dissipate 360 mW
together, the diodes dissipate 396 mW
total power dissipated by the array is 756 mW
the array draws current of 120 mA from the source, which is 4AA batteris.
LEDs in this diagram are white LEDs with 3.3v of diode forward voltage
If you want to use colored LEDs those use less power, around 2.2v. You can work it out on this LED Calculator and then do the wiring diagram option and it will give you pictures of how to lay it out.
To buy: Wire, 6x white 3v LEDs, 6x 150 ohm resistors (brown green brown), tape or a battery compartment for 4x AAs.
lordnacho:
Arduino Lillypad? I haven't used or seen one in person though
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