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Author Topic: Optoisolator TLP521  (Read 1229 times)
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Hi all,
I have a simple question: I would like to use an optoisolator to control some devices from digital output of arduino board. In my case optoisolator is a TLP521, can I connect directly digital output to anode and cathode to gnd or I have to use a resistor between digital output of arduino and anode of TLP521?

many thanks
Fabrizio
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Ciao Fabrizio


You should use a 270 ohm resistor from one of the arduino pin and connect it to the anode of the optocoupler
the cathode is connected to ground.

massimo

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Grazie  smiley
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