Re: Basic question about LEDs with USB chip
- From: Dave <onlinefuel@xxxxxxxxx>
- Date: 28 Apr 2007 12:54:11 -0700
if the LEDs will signal when a given opto-coupler is on, why not just
parallel it with the led pins on the opto and then lower the
resistance value slightly? if you use red LEDs, think about using high
efficiency... although a tad more expensive, they will glow very
brightly at just 2mA - I bet if you paralleled them, you wouldn't even
need to lower the resistor value at all.
BTW a PIC will sink or source 25mA - the outputs are designed to
direct drive LEDs and 25mA is about as much current as you'll ever
need for a stock LED - I find I can get good brightness with much less
- hate LEDs so bright (as indicators rather than light source) they
make you squint.
This is all fairly new to me and just finding the right LED to use has
taken forever. The one I currently have planned is green, not red.
Are there high efficiency green LEDs? Here is another one that is red
(http://www.us.kingbright.com/images/catalog/SPEC/APA3010EC.pdf) Is
this the kind you mean? I want the LED to glow through the front
panel of the enclosure.
.
- References:
- Basic question about LEDs with USB chip
- From: Dave
- Re: Basic question about LEDs with USB chip
- From: feebo
- Basic question about LEDs with USB chip
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