Switching using Optocoupler
i hoping duplicate function of simple push button switches reside on 3d printer lcd control panel. after bit of googling thought might able use ild74 type optocouplers. @ moment 5v supply series resistor of 220 ohms getting 60 ohms across phototransistor output not switch yet. if take out series resistor drops 10 ohms current drain around 200ma on led no driving arduino. should use different method or doing wrong ? appreciated.
up on thinking problem. 60r resistance ground more enough give logic low on input pin internal pull resistors enabled.
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