A LED dog collar with keyboard keys, Simple and fun for the whole family.
Your dog will be begging you for one.
Inspired by: momo
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Signing UpStep 1Get your stuff together
Safety glasses.
Hot glue gun with lots of glue.
Dremel.
Wire cutters and strippers.
Soldering iron and solder.
Scissors or knife.
Multimeter.
Supplies you might need.
Dog collar.
Led. I used 9 green ones.
Resistors.
Keyboard Keys.
Wire.
Heat shrink.
Altoids gum tin.
Power plug and jack.
9V battery snaps.
9V battery.
Velcro.
Cloth. I used old jeans.
I think thats it.
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This a great way to help your dog get his/her geek on!! Four paws up!
You will a nice piece of Odessa created LED light doodle art!
http://www.instructables.com/id/LED-Light-Drawing-Pens-Tools-for-drawing-light-do/
3V is probably a bit high for a (standard) green LED. The 'typical' forward voltage might be rated at something like 2.5V. They do vary between types of LED, though, even within one colour.
You could probably run it at 3V, but it might draw too much current from the battery with 9 being powered at once. It might also be painfully bright (depending on the LED type) and the LED would likely not last as long, especially if the increased current overheated it.
Unless you have an application that requires a really bright light, it's usually best to run LEDs quite a bit below their typical voltage (and therefore current) to avoid overheating, and it'll also mean that the batteries run far longer.