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The proper way to do this is something like this:<br>
<br>
<img src="cid:part1.02030804.01000804@venturesystemdesign.com"
alt=""><br>
<br>
connect LED_1 to your GPIO pin. You can use almost any small fet. I
don't recommend a transistor, if so you will have to put in a pull
down resistor to completely turn it off.<br>
<br>
Resistor R12 controls the current and therefore the brightness
depending upon the led you are using. Different colors require
different currents since their voltage drop is not the same. Try not
to go below about 120 ohms..10-20ma is sufficient to light most
leds.<br>
<br>
Ken...hardware designer and software guy <span
class="moz-smiley-s1"><span> :-) </span></span><br>
<br>
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