Quote:
Originally Posted by Ether
Sounds to me like the output impedance of the DIO signal line is too high to provide enough current to light the LED (as mentioned in my earlier post).
Disconnect your LED circuit and put a voltmeter (a cheap $10 one will do) between signal and ground at the DIO output. Flip the DIO true/false and confirm that you are getting 5 volts and zero volts.
Now connect your LED circuit (leaving the voltmeter connected between signal and ground). My guess is that you will no longer see 5 volts. The impedance of the signal source will drop the voltage below that necessary to provide the current to light the LED.
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I'll check as soon as the show is over (the robot is part of the play Something's Afoot). If that is the case, what is the solution?
If I use a spike to control it, I assume I will need a different resistor to handle a 12v input? Or I run 5v throught the spike?