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Topic: What kind of Potentiometer do I need? (Read 1 time) previous topic - next topic

MAS3

Quote from: tmacke17

why shouldn't the pot control LEDs?


Because you will probably be regulating voltage instead of amperage.
LED's brightness can be set a lot smoother, safer and have a much better range by using PWM and thus using an Arduino, but ofcourse you can also use a 555.
Using a 555 and a few components will save you some money, but you'll have to build a PCB or use a breadboard (times 3).
To save space you could also consider a 558 which is 4 * 555 in one.
Have a look at "blink without delay".
Did you connect the grounds ?
Je kunt hier ook in het Nederlands terecht: http://arduino.cc/forum/index.php/board,77.0.html

tmacke17

Well then if its going to be that much trouble I guess it's going to be with an arduino... Any one know of any cheap arduino clones?

I know of the teensys but those are just about as much as a arduino from amazon.. So...

Thanks everyone, I guess I misunderstood potentiometers!!
Macke

MAS3

If you're going for cheap, you can consider a chinese nano board.
They are cheap, small and offer enough for your LED bars.
Shipping is often included in the ridiculous low prices but you might have to wait for 2 - 4 weeks for them to arrive.

As there is no financial contribution to the Arduino community in these low prices, you might consider donating a bit some time in the future as a thank you to it.
Have a look at "blink without delay".
Did you connect the grounds ?
Je kunt hier ook in het Nederlands terecht: http://arduino.cc/forum/index.php/board,77.0.html

MarkT

Surely a 555 timer and a MOSFET switch can do PWM cheaper than an Arduino?  Something like:
http://www.youtube.com/watch?v=8iPkVYiSX4A
[ I won't respond to messages, use the forum please ]

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