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To check if its cooked just try to power it like you would normallyIf it is in fact fried, then you will need to replace it unless you dont want your robot to have a status LED.Chances are the complete circuit had the resistor in series so I think you should be ok. Depends on where in the circuit you made the short. If you had the $50 robot code loaded into the MCU already then chances are you didnt actually do anything. If im not mistaken, the LED comes on shortly after powering the MCU.
no problem. If im not mistaken, you might have your LED in backwards? Voltage is supposed to flow from pin 7 through the LED and sink into pin 6. Since LEDs are polarized, they will only light when voltage goes in the right direction. When you shorted the two pins, voltage was flowing in the opposite direction from the unregulated input rail and back into pin 7. May want to double check on that one
I was referring to the pins in the headers... perhaps I didn't read your original post correctly and I'm thinking of the wrong pins that you accidentally shorted. In which case: Sorry >_<Was it the header pins you were contacting or the MCU pins?
If it helps, the LED specified in the $50 robot can be backwards - the shorter leg being positive, and the longer being negative. Seems like an error in manufacturing.
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Mechanics and Construction