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Projects General Guidance
11

This is a if-else-construction:

ledState = ledState == HIGH ? LOW : HIGH;

In words: is ledState HIGH ? then the result is LOW else the result is HIGH.
In this case the result goes into the ledState variable.

It is the same as this:

if( ledState == HIGH)
  ledState = LOW;
else
  ledstate = HIGH;

But you need the ? and the :

Use a normal if-else if it looks weird.