'Remote' switch not being recognised in ag? What am i missing?

[m_elias]

Seeing as 2 of your 3 inputs are working I doubt this is your problem but see my issue here.

Fake 4n33?

[20200728_164602] My 100 4n33 optocouplers from AliExpress seem to be defective or fake. First, no good pin 1 markings, so I assumed bottom left when the label is upright but they never let the Arduino pin go higher then 0.7 volts. Take it out and the Arduino pin goes HIGH. I double checked my resistors and they seem correct. [20200728_165527]