Can I use the 3.3V pin from my Arduino Due to power the VCC pin on this optocoupler? I want to confirm if the optocoupler can reduce the 24V input signal to a 3.3V output level suitable for the Arduino due
I will take a SWAG and suggest that it can be accomplished by changing the resistor for each channel. This link should assist you with the resistor changes: Mantech Datasheet.
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It looks like you're meaning with 24V to the LED side, you want to check the operation of the corresponding (photo-)transistor. Staying conservative - one at a time - what you propose is sound.
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