32 LEDs with less than 20mA

[Demon]

Just an example of how little current is required to light 32 LEDs simultaneously:

18F44K22 using internal oscillator at 64MHz

LED turned ON
PAUSEUS 500
LED turned OFF
PAUSEUS 500

...repeat for 31 other LEDs


Not bad, 18.97mA for 32 LEDs and PIC mcu.

To the naked eye, they all appear ON without blinking. A little pale, I could reduce the 330ohm resistor a little bit, maybe 270ohm, but this was taken under the kitchen light.

Robert

[rsocor01]

Just an example of how little current is required to light 32 LEDs simultaneously

Not really . I have a similar project where I drive 8 digits in an LED display by multiplexing them one at a time. Also, to the naked eye they all appear to be ON at the same time.

[Demon]

They are lit simultaneously, but look at the code, they blink one at a time.

[Heckler]

Wow demon,

that's a LOT of LED's

Hop over to ebay and search on "rapid prototyping LED"
You will find some nice little LED modules all wired up with resistors ready to pop into your bread board. Just ordered me some green ones.

They are all 6 LED's per module I couldn't find any that were 8. But still pretty nice and easy to use.

[Heckler]

actually here are some that are 8 LED's per module.
But they are a little different in the way they pinout
and quite a bit more money... about $10US including shipping versus about $2 shipped for the 6 LED ones.

http://www.ebay.com/itm/Rapid-Protot...#ht_2014wt_805

[Demon]

Did I mention I have a boatload of Leds and resistors? LOL

I bought a wide variety on ebay several years ago, knowing I'd use them in projects eventually.

I have enough "stuff' to print barcodes and start an inventory (future android project).

So many ideas, so little will power.

Robert


Edit: oh yeah, those are neat. Must cut down on setup time when you have a lot in your circuit.