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556  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: newbie question on resistors on: November 07, 2007, 03:05:44 am
Easiest just to read LadyAda's latest tutorial. It goes in to this indepth. smiley-wink
557  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Solder Fumes on: November 05, 2007, 05:03:28 am
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The lead tests came back negative, along with a $200 bill for the ambulance.
Hahahaha. That made my day. ;D

I just hold my breath usually. Its not too bad.

Wikipedia seems to say that they are moving away from Rosin to water based fluxex.
558  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: motorized faders in arduino? on: November 02, 2007, 06:31:25 pm
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You could use a digital pin (+ something more) if you just want to turn the motor on / of, but this would not allow you to control the speed or direction af the motor. You would al least need to control direction since the faders must be able to go both up and down.
Using two output pins allows direction. Speed requires PWM though.
559  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: motorized faders in arduino? on: November 01, 2007, 05:14:08 pm
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If so,  can I use 48 motorized faders (meaning 48 motors) in a single arduino?
You'll need something else to control the motors. A Arduino cant handle that kind of current.
Google around for various motor controllers. Then use something like a 595 to allow the Arduino to control that many motor controllers.
560  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: High Frequency Outputs with Arduino? on: November 01, 2007, 11:39:21 pm
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if I were to program it in assembly, but I think that would mean I would have to get a new programmer.
A) Said programmer is only 4 resistors or so. smiley
B) C is translated to a .hex file and then transfered. Assembly is processed the same way. You'd just need to figure out the right commands to use assembly.
561  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How long can arduino run off a 9v battery? on: October 25, 2007, 04:39:26 am
*Drool*

Now to figure out something I can run off a battery to try it with. smiley-wink
562  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino and multipel analog inputs on: October 20, 2007, 07:42:59 pm
There are plenty of things like temp sensors which run off the I2C bus which uses a digital signal instead of analog.
563  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: LED Snowmobile Tail light on: October 19, 2007, 11:28:46 pm
I dont see how it would cost more than $200 or so if you used ultra bright LEDs.
564  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: LED Snowmobile Tail light on: October 19, 2007, 04:48:17 am
1. It flickers each LED on and off rapidly so only one LED is on at any time. Looks the same but saves power.
2. No idea.
3. Arduino plus one of the chips with a little bit of solder and hey presto!
565  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: LED Snowmobile Tail light on: October 15, 2007, 10:48:38 pm
A MAX7219 would do the trick. It can do up to 64 outputs with dimming.
You'd be using half of it.
566  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: prototype ltd edition on: October 11, 2007, 04:08:22 am
Hey hopefully it'll be a collectors item eventually. ;D
I got one too.

Its identical to the production ones.
567  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Software emulator of Arduino ? on: October 02, 2007, 05:38:10 pm
Probably wouldnt be too difficult to make one.
I dont know of any already existing though.
568  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: driving LEDs on: October 13, 2007, 07:43:37 am
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But concering the maximum supply current it is important to understand, that at any given point in time a group of 8 Led's are switched on or off
Uuuh no. Only one LED is on at any one time with those chips.
Go read the datasheet.
569  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: driving LEDs on: October 12, 2007, 11:40:15 pm
Yeah yeah I meant the 7219/21. smiley-razz
The 21 uses SPI while the 19 doesnt. Only difference.

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The MAX7221 always switches a group of 8 Led's on or off.
No, it does a 8x8 array of LEDs. Also works well with 8 7 segment displays.
570  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: driving LEDs on: October 12, 2007, 12:55:20 am
Slower animation which you'll be wanting is dead simple with the Arduino.

I'd use the MAX7921. It drives a 8x8 grid so if you want bigger you just hook more up together (they only need one set of pins).
Its also rather light on the battery because only one LED is on at any time yet it still looks good.
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