30 LED Fader using PWM and Arduino

A circuit that uses PWM to fade in and out certain LEDs from an array of 30 possible LEDs. All LEDs will fade in and out at some point or another.

code + schematic here:
http://little-scale.blogspot.com/2008/01/32-led-fader-with-arduino.html

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http://little-scale.blogspot.com

Category:

Science & Technology

Tags:

• little
• scale
• sebastian
• tomczak
• adelaide
• LED
• pwm
• arduino
• array
• control
• fader
• fade
• pulse
• width
• modulation

[LeKrizz]

pretty cool... but nothing really special. that's what i've learned after 4 school hours of programming...

[littlescale]

@LeKrizz Who said it was special?

[skierplaterandy]

is it multiplexed? or arduino mega?

[littlescale]

multiplexed :)

[teabagtime]

How come your wires are so neat on the left, but pure spaghetti on the right?

Or... is it some political statement?

[littlescale]

lol, political statement!

to the left is the ground bus. So all of the cathodes of the LED's must be going to the same ground point yeah?

But... each LED is controlled individually at its cathode point. Hence, a the pure spaghetti.

Oh, no, hang on. No, no, i actually think it's a statement about the meaning of life in modern society.

;-)

[Rubdos]

@littlescale Eh, should the cathode of a multiplexed led go back into the microcontroller?! :p

[LeKrizz]

@reesk92 forget about that was 2 months ago... to explain it further: I was bored all the time. I already knew the basics of programming, but thanks to my classmates i had to wait for them finishing their crap.

[reesk92]

@LeKrizz err did you mean to sound like a ass when you said that so what if you learnt it in 4 hours of school he may of learnt it in 20 minutes of playing about maybe he figured it out for himself and didnt need a teacher to teach him it

[Darky9312]

@PreadMusic When you are multiplexing, you can use a lesser resistor than normal, because the Led is just a very short time "on". There are formulas to calculate the dimension of the resistor. For the first tryings I would advise you to use the normal resistor, because if the multiplexing stops by accident or you do something wrong, the Leds will be destroyed. Hope i could help you and sorry for my bad english... I'm german ;)

[MultiJohn12321]

is this multiplexed? or arduino mega?

[LeKrizz]

@littlescale if you look at all those comments that include questions like ''WTF HOW'D YOU DO TAHT'' or ''WHY DID YOU DO TAHT LIKE DIS''..

[JohnnyX50]

cool its like one of those things you see in the background of an eighties sci-fi series, like night rider or battlestar galactica :D

[PreadMusic]

I have a question. You say they are multiplexed, so if there are 30 LEDs, then that means that each LED is lit for 1/30th of the time while the multiplexer is running other LEDs. that would make the LED have only 1/30th of full brightness, right? how are your LEDs bright enough to see at all? Reason is, i wanted to make a 64LED multiplexed display but thought the leds would be too dim to see