Can one pinOut do two things? Ie drive a LED and at the same time switch a transistor to run a solinoid. Ie every time the transistor base is energized (and the 13v solinoid fires) I want an LED to turn on. Not enough pin outs to just use a second pin so would like one pin to do double duty. And problems with this?
Andy O
Which transistor and which LED?
Sure, but easier to connect the LED and a proper series resistor in parallel with the solenoid and let the transistor control both.
Yes, it tells you what is actually happen on the output driver.
Good thought thanks. So I step down (with a resistor) the 13v going to the solinoid?
And if a red LED, it will also keep the FET turned off until the microcontroller boots.
Green, blue or white LED, maybe not.
Note that Larry subtly pointed out that you need a logic-level FET, not a 1980s transistor. 
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