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Topic: Optoisolator TLP521 (Read 2112 times) previous topic - next topic


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


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.



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