[Noisebridge-discuss] Electronics Question
jake at spaz.org
Tue Sep 24 07:43:31 UTC 2013
did you try swapping the "output" pins of the optocoupler? It is a
photodiode in there (not a relay) so it does care about polarity i think.
it seems like you are being properly methodical, keep it up and you will
Your calculation of 33 ohms for the LED side of the optoisolator is
probably fine, although 100 ohms would probably work just as well. You
are supplying 5V from the arduino, to an LED (maybe infrared in there)
which takes maybe 1.8 volts, at 0.020 amp. so 5v - 1.8v = 3.2v, and a
resistor making 0.020 amps at 3.2v is 3.2 / 0.020 = 160 ohms. Just my
guess without looking at the datasheep.
what are you trying to make?
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